Statistical Calculators
Here you'll find a set of statistics calculators that are intuitive and easy to use. Included are a variety of tests of significance, plus correlation, effect size and confidence interval calculators.
Not sure which test to use? Try our Which Statistics Test? wizard.
T-Tests
ANOVA
Chi-Square Tests
Correlation
Non-Parametric Tests
Descriptive Statistics
Grubbs Test for Outliers
Detect a single outlier in normally distributed data
ESD Test
Detect multiple outliers using the Generalized ESD test
Skewness and Kurtosis
Measure symmetry and tail-heaviness of a distribution
Sum of Squares
Calculate sum of squared deviations from the mean
Standard Error of Estimate
Calculate standard error of the estimate for regression
Coefficient of Variation
Measure relative variability as a percentage
Interquartile Range
Calculate the range of the middle 50% of data
Other Tests
Z-Test for Sample Mean
Compare sample mean to population mean using z-test
Z-Test (2 Proportions)
Compare proportions between two groups
Fisher Exact Test
Exact test for 2×2 tables (small samples)
Binomial Test
Test if observed proportion differs from expected
Levene's Test
Test equality of variances
Cohen's Kappa
Measure inter-rater reliability for categorical items
Critical Value Calculator
Find critical values for z, t, chi-square, F and r distributions
