Statistics Tools

This calculator produces a power regression equation based on values for a predictor variable and a response variable. This equation takes on…

Simpson’s Diversity Index is a way to measure the diversity of species in a community. To calculate this index for a given…

The Shannon Diversity Index is a way to measure the diversity of species in a community. To calculate this index for a…

A type II error occurs in hypothesis tests when we fail to reject the null hypothesis when it actually is false. The…

Hedges’ g is a way to measure effect size, which gives us an idea of how much two groups differ. It is…

A G-test of Goodness of Fit is used to determine whether or not a categorical variable follows a hypothesized distribution. To perform…

This calculator finds the area under the normal distribution between two z-scores. Simply enter the two z-scores below and then click the…

A grand mean is calculated as the average of the means of several groups. To calculate the grand mean, simply enter the…

This calculator constructs a confidence interval for the mean of a Poisson distribution based on the number of observed events. Simply fill…

The Binomial distribution is one of the most commonly used distributions in statistics. To find probabilities related to the Binomial distribution, simply…