Back to Free Tools
FREE TOOLS
Group Mean Comparison Calculator
Compare supplied numeric groups with Welch or one-way ANOVA calculations.
Groups as JSON arrays, Comparison
JSON
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Enter the displayed example values,or choose the local input files requested by the controls. Optional source files take precedence where labelled.
- Choose Calculate result and inspect the complete result and any reported limitations.
- Use Download result and each companion download link to save complete outputs. Reset clears output and restores example controls.
Examples
Groups as JSON arrays: [[1,2,4],[2,3,7]]
Comparison: welch
Limitations
- Compare two independent groups with a two-sided Welch t test,or2–20 groups with one-way ANOVA. Report all group moments,test statistic,df and p-value. Welch needs two observations per group; ANOVA needs residual degrees of freedom. Identical constant groups have undefined inference; separated constant groups report p=0 with a null nonfinite statistic. ANOVA assumes independent normal errors and equal population variances; no post-hoc comparisons. Numeric JSON arrays,at most10,000 observations,each within +/-1e12; no strings,nulls or missing values. Download the complete JSON report. All processing stays in your browser. Combined input limit: 400,000 UTF-8 bytes, 100,000 characters per field; report limit: 4 MiB. Floating-point rounding and probability underflow can occur.
- Complete outputs only. Unsupported or oversized input is refused. Follow the displayed job-specific bounds and format policies.
Related tools
No items found.