One-Way ANOVA

One-Way ANOVA — compare the averages of three or more groups in one test, the right way. Type each group's numbers and instantly get the F statistic, the p-value, eta-squared effect size and a group-means chart with error bars — so you can see whether at least one group truly stands apart. Fully offline.

Three teaching methods, three sets of scores — which works best? You could run a t-test on every pair, but each comparison risks a false alarm, and the more you run the more likely you call something "significant" by accident. ANOVA does it all in one go: it splits the variation into the part BETWEEN the group means and the part WITHIN the groups (random noise), and if the between part is big compared to the within part, the groups really differ.

No sign-up. No internet needed. No data collected. Just clear, instant statistics.

WHAT YOU CAN DO

• Test — type each group's values into its own column (add or remove groups and values with a tap) and instantly get the full ANOVA table: sums of squares, degrees of freedom, mean squares, F and p.

• Chart — see each group's mean with ±1 standard-error bars against the grand mean, and the F-distribution with the rejection zone shaded and your F marked.

• Concept — learn why many t-tests inflate the error rate, how ANOVA splits the variation, and what F, the degrees of freedom and eta-squared mean — with offline, beautifully typeset formulas that never overlap.

• Simulate — pull three group means apart and change the sample size with + / - steppered sliders, then watch the F climb and the p-value drop.

• Examples — load real multi-group studies (teaching methods, fertilizers, diets and more) with one tap.

WHAT YOU GET

• The complete one-way ANOVA table (SS, df, MS, F, p).
• Eta-squared — the share of variation explained by the groups.
• A group-means chart with error bars and the grand mean.
• An F-distribution chart that makes significance visible.

WHY YOU'LL LIKE IT

• One test, many groups — no error-rate inflation from repeated t-tests.
• See the spread between vs within — the heart of how ANOVA works.
• Effect size too — eta-squared says how big the difference is, not just whether it exists.
• Fully offline — every statistic, chart and formula works with no connection.
• Hands-on — type exact data, or pull means apart with sliders and + / - steppers.
• Clean "Cobalt & Orange" design, easy on the eyes.

A note on next steps: ANOVA only says at least one group differs — to find WHICH groups, follow up with post-hoc comparisons. Whether you are a student learning the F-test, a researcher comparing conditions, or anyone weighing several groups at once, One-Way ANOVA gives you the table, the test and the picture in seconds.

Download it, enter your groups, and see whether their averages really differ.

Recent changes:
improve app performance and stability