Calculators

Calculates the probability of observing a test statistic as extreme as, or more extreme than, the one calculated, assuming the null hypothesis is true.

Calculates the proportion of the variance in the dependent variable that is predictable from the independent variable(s) in a regression.

Calculates the average of the absolute differences between each data point and the mean.

Calculates the ratio of the standard deviation to the mean, providing a relative measure of dispersion.

Calculates the median of a set of numbers. The median is the middle value in a dataset when the numbers are arranged in order.

This calculator determines the percentile rank of a given score within a dataset. It calculates the percentage of values in the dataset that fall below the specified score.

Calculates the difference between the maximum and minimum values in a dataset.

Calculates probabilities related to the time until an event occurs in a Poisson process. The exponential distribution models the time until an event happens, given an average rate of occurrence.

Calculates the pooled standard deviation, an estimate of the standard deviation for two samples assuming equal variance, often used in two-sample t-tests.

Calculates the sum of squared deviations from the mean, a key component in variance and regression analysis.