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adding two-sample t-test assuming unequal varirance aka Welch test
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Diff for: ‎src/ontology/stato.owl

+128-2
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@@ -914,6 +914,9 @@
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<Declaration>
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<Class IRI="#STATO_0000298"/>
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</Declaration>
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<Declaration>
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<Class IRI="#Welch_t-test"/>
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</Declaration>
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<Declaration>
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<Class IRI="#covariance"/>
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</Declaration>
@@ -7296,6 +7299,71 @@
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<Class IRI="http://purl.obolibrary.org/obo/STATO_0000224"/>
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</ObjectSomeValuesFrom>
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</SubClassOf>
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<SubClassOf>
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<Class IRI="#Welch_t-test"/>
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<Class IRI="http://purl.obolibrary.org/obo/OBI_0200000"/>
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</SubClassOf>
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<SubClassOf>
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<Class IRI="#Welch_t-test"/>
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<ObjectSomeValuesFrom>
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<ObjectProperty IRI="http://purl.obolibrary.org/obo/OBI_0000293"/>
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<Class IRI="http://purl.obolibrary.org/obo/STATO_0000053"/>
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</ObjectSomeValuesFrom>
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</SubClassOf>
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<SubClassOf>
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<Class IRI="#Welch_t-test"/>
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<ObjectSomeValuesFrom>
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<ObjectProperty IRI="http://purl.obolibrary.org/obo/OBI_0000293"/>
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<Class IRI="http://purl.obolibrary.org/obo/STATO_0000059"/>
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</ObjectSomeValuesFrom>
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</SubClassOf>
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<SubClassOf>
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<Class IRI="#Welch_t-test"/>
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<ObjectSomeValuesFrom>
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<ObjectProperty IRI="http://purl.obolibrary.org/obo/OBI_0000299"/>
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<Class IRI="http://purl.obolibrary.org/obo/OBI_0000175"/>
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</ObjectSomeValuesFrom>
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</SubClassOf>
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<SubClassOf>
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<Class IRI="#Welch_t-test"/>
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<ObjectSomeValuesFrom>
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<ObjectProperty IRI="http://purl.obolibrary.org/obo/OBI_0000417"/>
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<Class IRI="http://purl.obolibrary.org/obo/STATO_0000255"/>
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</ObjectSomeValuesFrom>
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</SubClassOf>
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<SubClassOf>
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<Class IRI="#Welch_t-test"/>
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<ObjectMinCardinality cardinality="1">
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<ObjectProperty IRI="http://purl.obolibrary.org/obo/OBI_0000293"/>
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<ObjectIntersectionOf>
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<Class IRI="http://purl.obolibrary.org/obo/OBI_0000751"/>
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<Class IRI="http://purl.obolibrary.org/obo/STATO_0000251"/>
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<ObjectSomeValuesFrom>
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<ObjectProperty IRI="http://purl.obolibrary.org/obo/STATO_0000205"/>
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<ObjectIntersectionOf>
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<Class IRI="http://purl.obolibrary.org/obo/STATO_0000019"/>
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<DataHasValue>
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<DataProperty IRI="http://purl.obolibrary.org/obo/STATO_0000129"/>
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<Literal datatypeIRI="&xsd;boolean">true</Literal>
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</DataHasValue>
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</ObjectIntersectionOf>
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</ObjectSomeValuesFrom>
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</ObjectIntersectionOf>
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</ObjectMinCardinality>
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</SubClassOf>
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<SubClassOf>
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<Class IRI="#Welch_t-test"/>
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<ObjectExactCardinality cardinality="2">
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<ObjectProperty IRI="http://purl.obolibrary.org/obo/OBI_0000293"/>
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<ObjectIntersectionOf>
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<Class IRI="http://purl.obolibrary.org/obo/OBI_0000679"/>
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<ObjectSomeValuesFrom>
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<ObjectProperty IRI="http://purl.obolibrary.org/obo/IAO_0000136"/>
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<Class IRI="http://purl.obolibrary.org/obo/STATO_0000193"/>
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</ObjectSomeValuesFrom>
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</ObjectIntersectionOf>
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</ObjectExactCardinality>
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</SubClassOf>
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<SubClassOf>
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<Class IRI="#covariance"/>
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<Class IRI="http://purl.obolibrary.org/obo/IAO_0000109"/>
@@ -20528,6 +20596,59 @@ http://stat.ethz.ch/R-manual/R-patched/library/stats/html/binom.test.html</Liter
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<IRI>#STATO_0000298</IRI>
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<Literal xml:lang="en" datatypeIRI="&rdf;PlainLiteral">exact binomial test</Literal>
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</AnnotationAssertion>
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<AnnotationAssertion>
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<AnnotationProperty IRI="http://purl.obolibrary.org/obo/IAO_0000114"/>
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<IRI>#Welch_t-test</IRI>
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<IRI>http://purl.obolibrary.org/obo/IAO_0000122</IRI>
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</AnnotationAssertion>
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<AnnotationAssertion>
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<AnnotationProperty IRI="http://purl.obolibrary.org/obo/IAO_0000115"/>
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<IRI>#Welch_t-test</IRI>
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<Literal xml:lang="en" datatypeIRI="&rdf;PlainLiteral">Welch t-test is a two sample t-test used when the variances of the 2 populations/samples are thought to be unequal (homoskedasticity hypothesis not verified). In this version of the two-sample t-test, the denominator used to form the t-statistics, does not rely on a &apos;pooled variance&apos; estimate.</Literal>
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</AnnotationAssertion>
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<AnnotationAssertion>
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<AnnotationProperty IRI="http://purl.obolibrary.org/obo/IAO_0000117"/>
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<IRI>#Welch_t-test</IRI>
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<Literal xml:lang="en" datatypeIRI="&rdf;PlainLiteral">Alejandra Gonzalez-Beltran</Literal>
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</AnnotationAssertion>
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<AnnotationAssertion>
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<AnnotationProperty IRI="http://purl.obolibrary.org/obo/IAO_0000117"/>
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<IRI>#Welch_t-test</IRI>
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<Literal xml:lang="en" datatypeIRI="&rdf;PlainLiteral">Orlaith Burke</Literal>
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</AnnotationAssertion>
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<AnnotationAssertion>
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<AnnotationProperty IRI="http://purl.obolibrary.org/obo/IAO_0000117"/>
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<IRI>#Welch_t-test</IRI>
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<Literal xml:lang="en" datatypeIRI="&rdf;PlainLiteral">Philippe Rocca-Serra</Literal>
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</AnnotationAssertion>
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<AnnotationAssertion>
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<AnnotationProperty IRI="http://purl.obolibrary.org/obo/IAO_0000118"/>
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<IRI>#Welch_t-test</IRI>
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<Literal xml:lang="en" datatypeIRI="&rdf;PlainLiteral">Welsh t-test</Literal>
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</AnnotationAssertion>
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<AnnotationAssertion>
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<AnnotationProperty IRI="http://purl.obolibrary.org/obo/IAO_0000119"/>
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<IRI>#Welch_t-test</IRI>
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<Literal xml:lang="en" datatypeIRI="&rdf;PlainLiteral">Welch, B. L. (1947). &quot;The generalization of &quot;Student&apos;s&quot; problem when several different population variances are involved&quot;. Biometrika 34 (1–2): 28–35. doi:10.1093/biomet/34.1-2.28</Literal>
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</AnnotationAssertion>
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<AnnotationAssertion>
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<AnnotationProperty IRI="http://purl.obolibrary.org/obo/IAO_0000119"/>
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<IRI>#Welch_t-test</IRI>
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<Literal xml:lang="en" datatypeIRI="&rdf;PlainLiteral">adapted from wikipedia:
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http://en.wikipedia.org/wiki/Welch&apos;s_t_test
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last accessed: 2014-05-06</Literal>
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</AnnotationAssertion>
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<AnnotationAssertion>
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<AnnotationProperty IRI="http://purl.obolibrary.org/obo/STATO_0000032"/>
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<IRI>#Welch_t-test</IRI>
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<Literal xml:lang="en" datatypeIRI="&rdf;PlainLiteral">t-test for independent means assuming unequal variance</Literal>
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</AnnotationAssertion>
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<AnnotationAssertion>
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<AnnotationProperty abbreviatedIRI="rdfs:label"/>
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<IRI>#Welch_t-test</IRI>
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<Literal xml:lang="en" datatypeIRI="&rdf;PlainLiteral">t-test for independent means assuming unequal variance</Literal>
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</AnnotationAssertion>
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<AnnotationAssertion>
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<AnnotationProperty IRI="http://purl.obolibrary.org/obo/IAO_0000115"/>
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<IRI>#covariance</IRI>
@@ -20603,6 +20724,11 @@ It uses a t-distribution for the test and assumes that the variables in the popu
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<IRI>#t-test-independent-means</IRI>
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<Literal xml:lang="en" datatypeIRI="&rdf;PlainLiteral">Philippe Rocca-Serra</Literal>
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</AnnotationAssertion>
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<AnnotationAssertion>
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<AnnotationProperty IRI="http://purl.obolibrary.org/obo/IAO_0000118"/>
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<IRI>#t-test-independent-means</IRI>
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<Literal xml:lang="en" datatypeIRI="&rdf;PlainLiteral">two sample t-test</Literal>
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</AnnotationAssertion>
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<AnnotationAssertion>
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<AnnotationProperty IRI="http://purl.obolibrary.org/obo/IAO_0000119"/>
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<IRI>#t-test-independent-means</IRI>
@@ -20616,12 +20742,12 @@ http://www.psychology.emory.edu/clinical/bliwise/Tutorials/TOM/meanstests/tind.h
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<AnnotationAssertion>
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<AnnotationProperty IRI="http://purl.obolibrary.org/obo/STATO_0000032"/>
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<IRI>#t-test-independent-means</IRI>
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<Literal xml:lang="en" datatypeIRI="&rdf;PlainLiteral">t-test for independent means</Literal>
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<Literal xml:lang="en" datatypeIRI="&rdf;PlainLiteral">t-test for independent means assuming equal variance</Literal>
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</AnnotationAssertion>
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<AnnotationAssertion>
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<AnnotationProperty abbreviatedIRI="rdfs:label"/>
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<IRI>#t-test-independent-means</IRI>
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<Literal xml:lang="en" datatypeIRI="&rdf;PlainLiteral">two sample t-test</Literal>
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<Literal xml:lang="en" datatypeIRI="&rdf;PlainLiteral">t-test for independent means assuming equal variance</Literal>
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</AnnotationAssertion>
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<SubAnnotationPropertyOf>
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<AnnotationProperty IRI="http://purl.obolibrary.org/obo/STATO_0000032"/>

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