G*Power

(Still under construction but there is some useful information below.)

G*Power is a software that can make sample size calculations and power estimations. It can manage most types of statistical tests except  Cox regression. G*Power can be downloaded from Dussedorf University.

Examples for comparing two groups – T-test and Mann-Whitneys test (click to watch)

Example 1 of sample size calculation for comparing two groups – T-test and Mann-Whitneys test
Example 2 of sample size calculation for comparing two groups – T-test and Mann-Whitneys test

Example for Logistic regression (click to watch)

Example of sample size calculation for unconditional binary Logistic regression when the independent variable is binary (such as gender)

Useful links

You should cite this article if you use its information in other circumstances. An example of citing this article is:
Ronny Gunnarsson. G*Power [in Science Network TV]. Available at: http://science-network.tv/gpower/. Accessed February 25, 2017.

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