Transcription of Sample Size - vanbelle.org
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Sample Size - vanbelle.org
2 SampleSizeThe rstquestionfacedbya statisticalconsultant,andfrequentlythela st,is, Howmany subjects(animals,units)doI need? , TypeII error, andone sidedversustwo questionistosettlethetypeofvariable(endp oint)theconsulteehasinmind:Isit continuous,discrete,orsomethingelse?Forc ontinuousmeasurementsthenormaldistributi onisthedefaultmodel,fordistributionswith binaryoutcomes, samplesizecalculation,foroneortwo groups,are:TypeI Error( )Probabilityofrejectingthenullhypothesis whenit is trueTypeII Error( )Probabilityofnotrejectingthenullhypothe siswhenit is falsePower=1 Probabilityofrejectingthenullhypothesisw henit is false 20and 21 Variancesunderthenullandalternative hypothe ses(maybethesame) 0and 1 Meansunderthenullandalternative hypothesesn0andn1 Samplesizesintwo groups(maybethesame)Thechoiceofthealtern ative hypothesisis they knew thevalueofthealternative hypothesis,they wouldnotneedtodothestudy.
CALCULATING SAMPLE SIZE USING THE COEFFICIENT OF VARIATION 31 Lakatos (1998). One advantage of a power of 0.95 is that it bases the inferences on
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Calculating Statistics Using PROC MEANS, Mean, Standard Deviation, BETTER APPROACH TO CALCULATING LIMITS, Mean and standard deviation, Calculating the mean and standard deviation, The mean and standard deviation, SAMPLING FOR INTERNAL AUDITORS, ANALYSIS OF CONTINUOUS VARIABLES COMPARING, Analysis of continuous variables, ANALYSIS OF CONTINUOUS VARIABLES: COMPARING, T-test