Calculate Sample Size Needed to : Formulas This calculator uses the following formulas to compute sample size and power, respectively: where nn is sample size ΦΦ is the standard Normal distribution function Φ−1Φ−1 is the standard Normal quantile function αα is Type I error ββ ...
Calculate Sample Size Needed to Test Odds Ratio: Equality This calculator is useful for tests concerning whether the odds ratio,OROR, between two groups is different from the null value of 1. Suppose the two groups are 'A' and 'B', and we collect a sample from both groups -- i.e. ...
Our calculators are pretty self-explanatory. At the top of each calculator's page you'll find a form and a graph. Enter values in the form, then you can examine the graph to learn how sensitive the required sample size is to the input values you've provided...
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Welcome to the calculators home page of PowerAndSampleSize.com! Not much to go over here. Our calculators are pretty self-explanatory. At the top of each calculator's page you'll find a form and a graph. Enter values in the form, then you can examine the graph to learn how sensitive...
Calculate Sample Size Needed to Test 1 Mean: 1-Sample, 1-Sided This calculator is useful for tests concerning whether a mean,μμ, is equal to a reference value,μ0μ0. The Null and Alternative hypotheses is either H0:μ=μ0H0:μ=μ0 ...
The calculators always round up the calculated sample size to the nearest whole number, which may create a "step" pattern in the graph. The graph is intended to provide you with a nice visual aid of how sensitive the required sample size is to the input parameter values. The y-axis (ver...
Sample Size,nn Power,1−β1−β Type I error rate,αα 1%2.5%5%10% True mean,μμ Null Hypothesis mean,μ0μ0 Non-inferiority or Superiority Margin,δδ Standard Deviation,σσ Calculate Calculate Sample Size Needed to Test 1 Mean: 1-Sample Equivalence ...
This calculator uses the following formulas to compute sample size and power, respectively: R Code Rcode to implement these functions: 1 2 3 4 5 6 7 8 9 10 11 pA=0.40 pB=0.25 delta=0.20 kappa=1 alpha=0.05 beta=0.20 (OR=pA*(1-pB)/pB/(1-pA))# 2 ...
Calculate Sample Size Needed to Test Time-To-Event Data: Cox PH, Equivalence You can use this calculator to perform power and sample size calculations for a time-to-event analysis, sometimes called survival analysis. A two-group time-to-event analysis involves comparing the time it takes for ...