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Keith Walker
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Stat Tests Mind Map on Numerical Stat Tests, created by Keith Walker on 26/04/2013.

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Keith Walker
Created by Keith Walker almost 12 years ago
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Numerical Stat Tests1 group2 Groups>2 Groups1 sample from a frame and 1variableParametricNon-Parametric1 samplet-testCompares means. H₀: μ =μ₁Wilcoxon signed rankstestranksvalues/differencesignoring signs. H₀;Median difference=0PairedIndependentexample:Example:ParametricNon-parametricPaired t-testCompare themean of thediferences betweenthe twomeasurements. If=0 then two groupsthe same. H₀; μ ofdiffs = 0Example: Recruits withtooth decay at onsetand 1 year later. OrCase Control studyWilcoxon signed ranks testRank thedifferences,ignoring signs.H₀; differencesbetween -veand +ve =0ParametricNon-Parametricunpaired t-testcompare means ofthe two samples. H₀:means in both groupsequalWilcoxon rank sumtest. Mann WhitneyU testSum the ranks inthe two groups andcompareANOVAbetween groupvariance (a) shouldequal within groupvariance (b) under theNull. ieHOMOSCDASTICTherefore H₀: a = b. H₁: a > bBased on F -RatioParametricNon-parametricKruskal-Wallis testSame as Wilcoxon ranksum but take intoaccount sample sizesDouble click this nodeto edit the textClick and drag this buttonto create a new node