ANOVA Calculator
Test whether group means differ significantly using one-way ANOVA.
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Enter data for each group, comma-separated, in separate text fields. At least two groups are required. The calculator performs one-way ANOVA and reports the F-statistic, p-value, and degrees of freedom.
About This Calculator
One-way ANOVA (Analysis of Variance) tests whether the means of three or more groups are significantly different. It compares the variation between groups to the variation within groups. A large F-statistic (small p-value) indicates that at least one group mean differs significantly from the others.
Frequently Asked Questions
What are the assumptions of ANOVA?
ANOVA assumes: (1) observations are independent, (2) each group is approximately normally distributed, (3) groups have roughly equal variances (homogeneity of variance).
What does a significant ANOVA tell me?
It tells you that at least one group differs from the others, but not which groups differ. Post-hoc tests (like Tukey HSD) are needed to identify specific group differences.
Can I use ANOVA with only two groups?
Yes, but for two groups, ANOVA is equivalent to an independent two-sample t-test. The F-statistic equals t-squared.