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T-Test: What It Is With Multiple Formulas and When to Use Them

This calculation can be used for hypothesis testing in statistics Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive ...
Institute for Fiscal Studies

A primer on power and sample size calculations for randomisation inference with experimental data

This paper revisits the problem of power analysis and sample size calculations in randomised experiments.
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Making Sense of the Two-Sample T-Test: Supercharge Your Hypotheses Tests

The two-sample t-test is one of the most commonly used hypothesis tests in Six Sigma work. It is applied to compare the average difference between two groups. You use it to determine if the difference ...
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Combined Rank Tests for the Two-Sample Problem with Randomly Censored Data

In the two-sample problem under random censorship we consider the uncensored observations and the censored ones as two separate groups. For each group a suitable rank statistic is obtained, and these ...