Mixed ANOVA

Mixed ANOVA — analyse a study with one between-groups factor AND one within-subjects factor at the same time. Get the full ANOVA table, both error terms, every F-test, and a grouped profile plot that makes the interaction obvious. Fully offline.

Many real experiments mix two kinds of comparison. Different people get different treatments (a BETWEEN-subjects factor — say CBT vs a drug), and every person is measured again and again over time (a WITHIN-subjects factor — say anxiety at week 0, 4 and 8). A mixed, or "split-plot", ANOVA is the test built for exactly this design, and this app runs it for you and explains what it means.

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

WHAT YOU CAN DO

• Data — type your own scores into a clean groups × conditions × subjects grid, name both factors and every level, and add or remove groups, conditions and subjects with + / - controls. Everything recomputes as you type.

• Plot — see the signature grouped profile plot: one bold line per group across the conditions, with faint per-subject lines behind it. Parallel lines mean no interaction; lines that cross or fan out mean the groups change at different rates.

• Concept — learn what a mixed design is in plain language, why it has TWO error terms, and see the offline, beautifully typeset formulas with no overlap.

• Simulate — dial the group difference, the trend across conditions and the group × condition interaction with sliders that have + / - steppers, then generate a dataset and watch when each F-test turns significant.

• Examples — load ready-made studies (therapy & anxiety, diet & weight loss, coaching & sprint times and more) with one tap.

WHAT YOU GET

• A full ANOVA table: the between factor, the within factor and the interaction, each with SS, df, MS, F and p.

• Both error terms shown correctly — Subjects-within-groups for the between effect, and Condition × Subjects for the within effect and the interaction.

• Clear significance flags so you can read the result at a glance.

• A profile plot that turns the interaction into a picture.

WHY YOU'LL LIKE IT

• Fully offline — every calculation, plot and formula works with no connection.

• Reads the interaction first — the part that matters most in a mixed design.

• Honest statistics — the right error term for every F-ratio, not a shortcut.

• Hands-on — type exact data, or build a sample with sliders and + / - steppers.

• Clean "Pine Clay" design, easy on the eyes.

• Privacy-friendly — your data stays on your device.

Whether you are a student learning the split-plot design for a methods class, a researcher checking a treatment-over-time study, or anyone who needs a repeated-measures comparison across groups, Mixed ANOVA gives you the table, the test and the picture in seconds.

Download it, enter your groups and conditions, and see whether the change depends on the group.