Chi-Square Calculator
Run a chi-square goodness-of-fit test on observed vs. expected frequencies.
Assumptions used in this calculation
- Degrees of freedom: Degrees of freedom are calculated as the number of categories minus 1 (df = k − 1), the standard convention for a goodness-of-fit test.
About this calculator
The chi-square calculator runs a goodness-of-fit test comparing observed frequencies against expected frequencies, returning the chi-square statistic, degrees of freedom and p-value.
Worked example
[10,20,30,40] vs [25,25,25,25]
Result: χ²=20, p<0.001 (significant)
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