Tools

We have a set of tools for estimating sample sizes.

Comparing two averages (means)

Prevalence Study sample size calculator

We often want to estimate the prevalence in a population (i.e., the proportion of individuals with a certain condition). For example, if we want to estimate the prevalence…

Logistic Regression Sample Size Calculator

A logistic regression has the output of Odds Ratios (OR) and is usually used when the outcome is binary (e.g. yes/no, success/failure). We usually use a logistic regression…

Diagnostic Accuracy (sensitivity/specificity) Sample Size Calculator

Diagnostics studies are relatively simple to conduct but require careful planning and data collection. It is important to identify gold standard test and diagnostic criteria…

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