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mathematics, for example in the study of statistical properties of graphs, a null model is a type of random object that matches one specific object in some of
Null_model
Statistical model for a binary dependent variable
model likelihood of the saturated model − ln likelihood of fitted model likelihood of the saturated model ) = − 2 ln ( likelihood of null model likelihood
Logistic_regression
Position that there is no relationship between two phenomena
The null hypothesis (often denoted H 0 {\textstyle H_{0}} ) is the claim in scientific research that the effect being studied does not exist. The null hypothesis
Null_hypothesis
Statistical theorem
( likelihood for null model likelihood for alternative model ) = 2 ln ( likelihood for alternative model likelihood for null model ) = 2 × [ ln (
Wilks'_theorem
represents the normalized weight of each link in the null model. Consecutively, and based on the null model, we can derive that the normalized weight distribution
Disparity filter algorithm of weighted network
Disparity_filter_algorithm_of_weighted_network
Marker used in SQL databases to indicate a value does not exist
database. Introduced by the creator of the relational database model, E. F. Codd, SQL null serves to fulfill the requirement that all true relational database
Null_(SQL)
Measure of network community structure
maximization is not statistically consistent, and finds communities in its own null model, i.e. fully random graphs, and therefore it cannot be used to find statistically
Modularity_(networks)
Hypothetical hybrid species
statistically test their own null model of simple speciation before concluding that speciation was complex, and—even if the null model could be rejected—they
Humanzee
Tribe of mammals
statistically test their own null model of simple speciation before concluding that speciation was complex, and—even if the null model could be rejected—they
Hominini
statistically test their own null model of simple speciation before concluding that speciation was complex, and—even if the null model could be rejected—they
Chimpanzee–human last common ancestor
Chimpanzee–human_last_common_ancestor
Software package for sequence analysis
Sequences that score significantly better to the profile-HMM compared to a null model are considered to be homologous to the sequences that were used to construct
HMMER
Statistical measure of fit
the model being fitted and the null model, respectively, \ln denotes the natural logarithm, and n is the number of observations. L0 is the model with
Pseudo-R-squared
American evolutionary ecologist and biogeographer
informatics. Biogeographical null models. With co-author David Winkler, Colwell developed one of the first biogeographical null models incorporating simulated
Robert_K._Colwell
Statistical test that compares goodness of fit
based on the ratio of their likelihoods. If the more constrained model (i.e., the null hypothesis) is supported by the observed data, the two likelihoods
Likelihood-ratio_test
How often identical letters appear in the same position in two texts
pair, assuming a uniform random distribution of the characters (the "null model"; see below). Thus, this formula gives the ratio of the total number of
Index_of_coincidence
Family of random graph models
Configuration Models provide a null hypothesis for understanding the role of degree distributions in shaping network properties. Configuration Models can be
Configuration_model
over- or under-represented graphlets with respect to some random graph null model. RGF-distance compares the frequencies of the appearance of all 3-5-node
Graphlets
Form of statistical factor analysis
chi-square for the hypothesized model to one from a “null”, or “baseline” model. This null model almost always contains a model in which all of the variables
Confirmatory_factor_analysis
Theory of evolutionary biology
controversy, and some authors consider it a more complex version of other null models that fit the data better. "Neutrality" means that at a given trophic
Unified neutral theory of biodiversity
Unified_neutral_theory_of_biodiversity
Ratio of competing statistical models
parameters, such as a null hypothesis and an alternative, but this is not necessary; for instance, it could also be a non-linear model compared to its linear
Bayes_factor
Statistical hypothesis test
model i. If the regression model has been calculated with weights, then replace RSSi with χ2, the weighted sum of squared residuals. Under the null hypothesis
F-test
Statistical test of variance
{\text{likelihood under fitted model if null hypothesis is true}}{\text{likelihood under saturated model}}}} While the saturated model is a model with a theoretically
Omnibus_test
Study of collection and analysis of data
idealized model. A hypothesis is proposed for the statistical relationship between the two data sets, an alternative to an idealized null hypothesis
Statistics
Statistical hypothesis test
test is valid when the test statistic is chi-squared distributed under the null hypothesis, specifically Pearson's chi-squared test and variants thereof
Chi-squared_test
Function of the observed sample results
In null-hypothesis significance testing, the p-value is the probability of obtaining test results at least as extreme as the result actually observed,
P-value
Measure of the quantity of an introduced species
Colautti et al. (2006), proposes that propagule pressure should act as a null model for studies that consider/compare processes of invasions to patterns of
Propagule_pressure
Instrument to measure minute voltage
A null detectors is an electrical measurement instrument used to measure minute voltages. High precision null detectors can resolve voltage differences
Null_detector
Global increase in species richness from polar regions to tropics
mid-domain models attempt to exclude any direct environmental or evolutionary influences on species richness, they have been claimed to be null models[citation
Latitudinal gradients in species diversity
Latitudinal_gradients_in_species_diversity
Probability distribution of the test statistic under the null hypothesis
the null distribution is the probability distribution of the test statistic when the null hypothesis is true. For example, in an F-test, the null distribution
Null_distribution
Observed inability to reproduce scientific studies
are presented here. In the most common case, null hypothesis testing, there are two hypotheses, a null hypothesis H 0 {\displaystyle H_{0}} and an alternative
Replication_crisis
Misinterpretation of statistical significance
alone. The p-value is computed under the assumption that a certain model, usually the null hypothesis, is true. This means that the p-value is a statement
Misuse_of_p-values
Concepts from statistical hypothesis testing
of a true null hypothesis in statistical hypothesis testing. A type II error, or a false negative, is the incorrect acceptance of a false null hypothesis
Type_I_and_type_II_errors
American singer-songwriter musician (born 1965)
two albums, Ghosts I–IV and The Slip, independently on his own label, The Null Corporation. In 2009, Nine Inch Nails went on hiatus following the Wave Goodbye
Trent_Reznor
Object with no referenced value or with defined neutral ("null") behavior
computer programming, a null object is an object with no referenced value or with defined neutral (null) behavior. The null object design pattern, which
Null_object_pattern
Searching for wild food resources
and 1970s. Their goal was to quantify and formalize a set of models to test their null hypothesis that animals forage randomly. Important contributions
Foraging
Diagnostic plot of binary classifier ability
S2CID 23054670. Karplus, Kevin (2011); Better than Chance: the importance of null models, University of California, Santa Cruz, in Proceedings of the First International
Receiver operating characteristic
Receiver_operating_characteristic
Fit of a species living under specific environmental conditions
be excluded, and assumption of such randomness can indeed serve as a null-model. – Many physiological and morphological differences between species can
Ecological_niche
property of being maximally unbiased null models for network inference (e.g. biological network inference). Each model defines a family of probability distributions
Maximum-entropy random graph model
Maximum-entropy_random_graph_model
Method of statistical inference
Bayesian estimation for assessing null values with Bayesian model comparison for hypothesis testing. Two competing models/hypotheses can be compared using
Statistical_hypothesis_test
Extinct human species
likely acting on archaic variants, and provides an appropriate set of null models for evaluating positive selection on introgressed segments on chromosome
Neanderthal
Statistical property of measurement
Modeling. 9 (2): 233–255. doi:10.1207/s15328007sem0902_5. S2CID 32598448. Widaman, Keith F.; Thompson, Jane S. (2003-03-01). "On specifying the null model
Measurement_invariance
Infinite cardinal number
ℵ 0 {\displaystyle \aleph _{0}} (read aleph-nought, aleph-zero, or aleph-null); the next larger cardinality of a well-ordered set is ℵ 1 , {\displaystyle
Aleph_number
Speciation that occurs between geographically isolated populations
complexity of speciation. Allopatry is often regarded as the default or "null" model of speciation, but this too is debated. Reproductive isolation acts as
Allopatric_speciation
a method that they developed, that of "null" models, to be used much in the way that all scientists use null hypotheses to verify that their results
History_of_ecology
Model of electrical conduction
The Drude model or the Drude–Lorentz model of electrical conduction in metals was proposed in 1900 by Paul Drude, and refined by Hendrik Lorentz in 1905
Drude_model
Statistical method for handling multiple comparisons
discovery rate (FDR) is a method of conceptualizing the rate of type I errors in null hypothesis testing when conducting multiple comparisons. FDR-controlling
False_discovery_rate
Statistical Markov model
A hidden Markov model (HMM) is a Markov model in which the observations are dependent on a latent (or hidden) Markov process (referred to as X {\displaystyle
Hidden_Markov_model
Statistical test comparing two probability distributions
distribution functions of two samples. The null distribution of this statistic is calculated under the null hypothesis that the sample is drawn from the
Kolmogorov–Smirnov_test
Form of causal modeling that fit networks of constructs to data
for each model degree of freedom, doesn't that mean that people testing models with null-hypotheses of non-zero RMSEA are doing deficient model testing
Structural_equation_modeling
Subfield of genealogy
the branching patterns in the molecular trees. This study rejected the null model and found that the origin for all extant Amazonian poison frog species
Phylogeography
Concept in graph theory
or even distinguish the graph from one generated by a null model such as the Erdos–Renyi model without community structure. This transition is independent
Community_structure
Solution of Einstein field equations
{e}}_{0}} and is therefore null. The circle r = r c {\displaystyle r=r_{c}} at a given t is a closed null curve, but not a null geodesic. Examining the frame
Gödel_metric
Ratio estimating the balance between nonsynonymous and synonymous substitutions
distinguish between a null model (Ka/Ks = 1) and the observed results. The Ka/Ks ratio is a more powerful test of the neutral model of evolution than many
Ka/Ks_ratio
Computer fault caused by access to restricted memory
error in programs written in languages that support pointers that can be null, or that can be set to an arbitrary value, or that support arrays, and in
Segmentation_fault
Concept in relational databases
and non-null primary key value; this is the same as saying that each row in a table represents a single instance of the entity type modelled by the table
Entity_integrity
Evolutionary theory
with a solid theoretical core, null hypotheses need to be incorporated and alternatives need to falsify the null model before being accepted. Otherwise
Constructive neutral evolution
Constructive_neutral_evolution
Obligation on a party in a dispute to provide sufficient warrant for their position
can be done without a null hypothesis, by specifying a statistical model corresponding to each candidate hypothesis and using model selection techniques
Burden_of_proof_(philosophy)
Type of sub-graph
interchangeably. There is an ensemble Ω(G) of random graphs corresponding to the null-model associated to G. We should choose N random graphs uniformly from Ω(G)
Network_motif
Proposed explanation for an observation, phenomenon, or scientific problem
hypotheses are compared. These are called the null hypothesis and the alternative hypothesis. The null hypothesis is the hypothesis that states that there
Hypothesis
Collection of statistical models
The objective random-assignment is used to test the significance of the null hypothesis, following the ideas of C. S. Peirce and Ronald Fisher. This design-based
Analysis_of_variance
Concepts underlying statistical methods
and the probability of exceeding that statistic under a default or 'null' model is compared to a threshold. The threshold (the numeric version of "sufficiently
Foundations_of_statistics
inhomogeneities may be occurring. The null model for point patterns is complete spatial randomness (CSR), modeled as a Poisson process in Rn, which implies
Point_pattern_analysis
Genetic technique for identifying organisms in mixed samples
PMID 17576602. S2CID 4219676. Vázquez, Diego P.; Aizen, Marcelo A. (2003). "Null Model Analyses of Specialization in Plant–Pollinator Interactions". Ecology
Metabarcoding
Ecological integrity assessment
Matthews, Jeffrey W.; Spyreas, Greg; Long, Colleen M. (May 2015). "A null model test of Floristic Quality Assessment: Are plant species' Coefficients
Floristic_Quality_Assessment
Immunodeficient laboratory mice brand
Activating Gene-1 (NOD- Rag 1 null ) Interleukin (IL)-2 Receptor Common Gamma Chain ( IL 2 Rγ null ) Null Mice: A Radioresistant Model for Human Lymphohaematopoietic
NSG_mouse
Discussion of the meaning and usage of the terms evolution, fact and theory
neutral theory of molecular evolution is used to study evolution as a null model against which tests for natural selection can be applied. The following
Evolution_as_fact_and_theory
Time series model
null hypothesis and conclude there is an ARCH effect in the ARMA model. If T'R² is smaller than the Chi-square table value, we do not reject the null
Autoregressive conditional heteroskedasticity
Autoregressive_conditional_heteroskedasticity
Statistical interpretation with many tests
Poisson distribution as a model for the number of significant results at a given level α that would be found when all null hypotheses are true.[citation
Multiple_comparisons_problem
Relational database programming language
follow standards. In particular, date and time syntax, string concatenation, NULLs, and comparison case sensitivity vary from vendor to vendor. PostgreSQL
SQL
Syntax for defining data structures
first_name VARCHAR(50) not null, last_name VARCHAR(75) not null, mid_name VARCHAR(50) not null, dateofbirth DATE not null ); Some forms of CREATE TABLE
Data_definition_language
American ecologist and professor
paradigm of competitively structured communities, championing the use of null models in community ecology. Debate on the subject in the ecological literature
Daniel_Simberloff
Order of amphibians
Michael P. L.; Savage, Jay M.; Gorman, George C. (1997). "Tests of null models for amphibian declines on a tropical mountain". Conservation Biology
Frog
Measure of connection disorder in a network
know the adjacency matrix). On the other hand, this ensemble serves as a null model when the actual microscopic configuration of the network is known, allowing
Network_entropy
Methods in evolutionary biology
JSTOR 2992503. Gittleman, J. L.; Kot, M. (1990). "Adaptation: statistics and a null model for estimating phylogenetic effects". Systematic Zoology. 39 (3): 227–241
Phylogenetic comparative methods
Phylogenetic_comparative_methods
Species delimitation method in molecular systematics
species. The model identifies a "threshold" time point where there is a significant shift in branching rates. It compares a null model, in which a single
General mixed Yule–coalescent model
General_mixed_Yule–coalescent_model
Study of angle-preserving transformations of a geometric space
the model flat geometry is defined analogously as the homogeneous space O(p + 1, q + 1) / H, where H is again taken as the stabilizer of a null line
Conformal_geometry
large number of randomized matrices; in addition it implements several null models to estimate the significance of nestedness. Bastolla et al. introduced
Nestedness
Database model
three-valued logic (True, False, Missing/NULL) version of it to deal with missing information, and in his The Relational Model for Database Management Version
Relational_model
Statistical hypothesis test
in which the test statistic follows a Student's t-distribution under the null hypothesis. It is most commonly applied when the test statistic would follow
Student's_t-test
1998 American biographical drama television film
effective portrait of a woman living from thrill to thrill." Christopher Null of Filmcritic.com gave the film 3 out of 5 stars. Conversely, Film Freak
Gia
Genetic study of ancient Neanderthal DNA
likely acting on archaic variants, and provides an appropriate set of null models for evaluating positive selection on introgressed segments on chromosome
Neanderthal_genetics
Brackish lake on the Altiplano in Chile
October 2021. De los Ríos-Escalante, Patricio (27 February 2011). "A Null Model to Study Community Structure of Microcrustacean Assemblages in Northern
Laguna_Miscanti
Scientific discipline
a null hypothesis to niche theory. The hypothesis has sparked controversy, and some authors consider it a more complex version of other null models that
Theoretical_ecology
modeled using a nullor, and the textbook analysis of a feedback circuit using an ideal op-amp uses the mathematical conditions imposed by the nullor to
Nullor
Type of data model
An entity–attribute–value model (EAV) is a data model optimized for the space-efficient storage of sparse—or ad-hoc—property or data values, intended
Entity–attribute–value_model
Time series statistical test
In statistics, an augmented Dickey–Fuller test (ADF) tests the null hypothesis that a unit root is present in a time series sample. The alternative hypothesis
Augmented_Dickey–Fuller_test
Evolution theory has become the null model against which tests for selection are based, and divergence from this model can be explained by directional
HKA_test
Multivariate statistical technique
of other (usually environmental) variables; this allows testing of a null model by Monte-Carlo permutation analysis. The example shows an ideal data set:
Detrended correspondence analysis
Detrended_correspondence_analysis
doi:10.1086/284619. S2CID 84663662. Gotelli, Nicholas; Graves, Gary. "Null models in ecology 1996". {{cite journal}}: Cite journal requires |journal= (help)
Hutchinson's_rule
Danish botanist (1860–1938)
spectrum" (Raunkiær 1918 – see below). Thereby, he devised the first null model in the history of ecology. Raunkiær was a keen naturalist, who described
Christen_C._Raunkiær
Concept in statistics
In statistics, a latent class model (LCM) is a model for clustering multivariate discrete data. It assumes that the data arise from a mixture of discrete
Latent_class_model
Networks with multiple kinds of relations
i α {\displaystyle P_{j\beta }^{i\alpha }} is the tensor encoding the null model and the value of components of S a i α {\displaystyle S_{a}^{i\alpha }}
Multidimensional_network
if the sample statistics are significantly different from the assumed null-model. True values of a population, which are unknowable in practice, are called
Statistical_proof
Statistical test
distance between the unrestricted estimate and its hypothesized value under the null hypothesis, where the weight is the precision of the estimate. Intuitively
Wald_test
American model and actress (born 1956)
July 2, 1956) is an American model and actress. She began modeling in the 1970s and became one of the most sought-after models in the world. She transitioned
Jerry_Hall
Machine instruction that indicates to a computer to do nothing
NOP or null statement if it has no effect. Null statements may be required by the syntax of some languages in certain contexts. In Ada, the null statement
NOP_(code)
Type of statistical test
from the null hypothesis. Thus, in applied statistics, a portmanteau test provides a reasonable way of proceeding as a general check of a model's match to
Portmanteau_test
Method of result aggregation from multiple clustering algorithms
GAP-statistic. However, these methods rely on certain assumptions for the null model that may not always be appropriate. Şenbabaoğlu et al demonstrated the
Consensus_clustering
Time series statistical test
the Dickey–Fuller test tests the null hypothesis that a unit root is present in an autoregressive (AR) time series model. The alternative hypothesis is
Dickey–Fuller_test
Concept in inferential statistics
\alpha } , is the probability of the study rejecting the null hypothesis, given that the null hypothesis is true; and the p-value of a result, p {\displaystyle
Statistical_significance
NULL MODEL
NULL MODEL
Girl/Female
Afghan, Australian, Danish, Swedish
God
Surname or Lastname
English
English : of uncertain origin, possibly from an unrecorded late survival of the Old English personal name Tula.South German (Tüll) : from a nickname for someone who was patient, from Middle High German dult ‘patience’; or from a personal name formed with the same word; or from Middle High German tult, dult ‘fair’, ‘festival’ (Bavarian Dult).South German : nickname for a stubborn man, Tull.Altered spelling of German Toll.
Surname or Lastname
Dutch and German
Dutch and German : from the personal name Nel, a reduced form of Cornelius.South German : nickname from Middle High German nelle ‘crown of the head’, perhaps denoting an obstinate person.English : from the Middle English personal name Nel(le), a variant of Neill.
Male
English
Medieval pet form of English Oliver, probably NOLL means "elf army."
Surname or Lastname
English
English : unexplained.Possibly a shortened form of any of several German compound surnames formed with Full- or Füll-.
Boy/Male
British, English
Grinder
Male
Hungarian
Hungarian form of Greek Emmanouel, EMÃNUEL means "God is with us."
Girl/Female
Arabic
Arabian Jasmine
Boy/Male
Shakespearean
Love's Labours Lost' A constable.
Surname or Lastname
English
English : from an Old English personal name, Lulla.German (Lüll) : from a short form of any of the Germanic personal names formed with liut- ‘people’ as the first element.Catalan (also Llull) : from the personal name Lullus, probably of Germanic origin.
Female
English
Pet form of English Eleanor, NELL means "foreign; the other."
Surname or Lastname
English
English : nickname for a strong, aggressive, bull-like man, from Middle English bul(l)e, bol(l)e. Occasionally, the name may denote a keeper of a bull. Compare Bulman.German (mainly northern) : from a byname for a cattle breeder, keeper, or dealer. Compare South German Ochs.South German : nickname for a short fat man, a variant of Bolle, or a nickname for a man with the physical characteristics of a bull.
Boy/Male
Hindu
Battle maiden
Boy/Male
British, English, Spanish
Strong Leader; Empty
Surname or Lastname
English
English : nickname from Middle English gulle ‘gull’ or gul(le) (Old Norse gulr) ‘yellow’, ‘pale’ (of hair or complexion).Swiss German : nickname for an irascible or unreliable person, from an Alemannic form of Latin gallus ‘rooster’. See also Guell.
Girl/Female
Greek American English French
Shining light. The bright one.
Boy/Male
Celtic
Champion.
Surname or Lastname
English
English : variant of Hill 1.English : from a pet form of Hugh.
Surname or Lastname
English
English : from the Old English personal name Cula.Americanized spelling of German and Swedish Kall or German Koll.
Girl/Female
American, Australian, British, Danish, English, French, German, Greek, Irish, Swedish
Shining Light; Light; The Light of the Sun from Eleanor and Variation of Helen; Sun Ray; Stone; Champion; Horn; Torch; Moon; Moon Elope
NULL MODEL
NULL MODEL
Girl/Female
Tamil
Girl of principles
Girl/Female
Tamil
Born from the earth, Another name of Goddess Sita
Girl/Female
Tamil
Girl/Female
Muslim
Clock
Boy/Male
Hindu
God of the land of Brij
Girl/Female
Arabic, Muslim
Guest
Boy/Male
Tamil
Balgovind | பாலகோவிஂத
Lord Krishna
Boy/Male
Hindu, Indian, Malayalam
A Jewel Worn on the Head
Girl/Female
Arabic, Turkish
Dear
Boy/Male
Basque French
Form of Michael 'Who is like God?'.
NULL MODEL
NULL MODEL
NULL MODEL
NULL MODEL
NULL MODEL
n.
A cully; a dupe; a gull. See Cully.
v. t.
To strip off or separate the hull or hulls of; to free from integument; as, to hull corn.
a.
Of or pertaining to a bull; resembling a bull; male; large; fierce.
v. t.
To dispirit or deaden; to dull or blunt.
v. t.
To heat, sweeten, and enrich with spices; as, to mull wine.
superl.
Furnishing little delight, spirit, or variety; uninteresting; tedious; cheerless; gloomy; melancholy; depressing; as, a dull story or sermon; a dull occupation or period; hence, cloudy; overcast; as, a dull day.
v. i.
To become dull or stupid.
v. t.
To move or operate by the motion of drawing towards one; as, to pull a bell; to pull an oar.
a.
Full to the brim; quite full; chock-full.
a.
Quite full; choke-full.
a.
No; not any; as, nul disseizin; nul tort.
superl.
Not bright or clear to the eye; wanting in liveliness of color or luster; not vivid; obscure; dim; as, a dull fire or lamp; a dull red or yellow; a dull mirror.
n.
A knob, handle, or lever, etc., by which anything is pulled; as, a drawer pull; a bell pull.
Compar.
Abundantly furnished or provided; sufficient in. quantity, quality, or degree; copious; plenteous; ample; adequate; as, a full meal; a full supply; a full voice; a full compensation; a house full of furniture.
n.
A contest; a struggle; as, a wrestling pull.
v. t.
To endeavor to raise the market price of; as, to bull railroad bonds; to bull stocks; to bull Lake Shore; to endeavor to raise prices in; as, to bull the market. See 1st Bull, n., 4.
Compar.
Not wanting in any essential quality; complete, entire; perfect; adequate; as, a full narrative; a person of full age; a full stop; a full face; the full moon.
n.
The act of rowing; as, a pull on the river.
n.
A promontory; as, the Mull of Cantyre.
v. t.
To gather with the hand, or by drawing toward one; to pluck; as, to pull fruit; to pull flax; to pull a finch.