G*Power is an easy to use application especially designed for statistics aficionados and students that can offer users power analysis tools for different statistical tests.
The application is very easy to use, as you just have to choose the appropriate test type and the desired parameters using the drop-down menus. It can perform calculations for F, t and χ2 tests, z test families and some exact tests. The calculation and graph plotting is done in seconds.
There are several statistical tests that the program supports, depending on the test family you choose. It can perform correlation, regression, means, proportion, variances and other tests using five different types of power analysis.
After setting the required input parameters (which can also be automatically determined based on observed frequencies or probabilities), press the 'Calculate' button and you're done! The central and non-central distribution is displayed in a graph, while the output parameters are calculated in a separate grid.
G*Power offers you the possibility to generate a bi-dimensional plot for a user-defined range of values. The distribution plot can be copied to clipboard or saved for later reference. In addition to this, you can view, save or print a log of every analysis you made.
A probability calculator is also included, which you can use to view the result of any number of input mathematical and statistical expressions. The displayed result is set to the value of the last one you write, while between the expressions you can add comments to state your objective.
While it can be used by statistical offices or research institutions, G*Power is a useful tool that can help teachers explain statistics better and students learn on their own without much effort.
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