Calculating Sample Size For A Case Control Study. A case-control design offers an alternative that is much more efficient. May 02 2019 To calculate the sample size one needs to specify the significance level alpha power gamma and the hypothesized non-null theta.
From the Epi Info main page select StatCalc. Inputs are the expected proportion exposed in the controls the assumed odds ratio and the desired level of confidence and power for the detection of a significant difference. Jan 09 2019 W196kern05em times kern05em frac sigma sqrt n 4 If an estimate of σ is available eg.
Nov 19 2001 The sample sizes computed are for the detection of a given disease-exposure odds ratio that is the sample sizes at which a certain statistical test will reject the null hypothesis that the odds ratio is one.
Dec 13 2019 The application will show three different sample size estimates according to three different statistical calculations. To estimate the magnitude of association between an exposure and an outcome. In the field Number of controls per case. The Unmatched Case-Control window opens.
