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chi-square
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Can you run a chi-square test on weighted survey estimates?
A chi-square test on weighted survey totals treats millions of estimated people as real observations. Why that fails and what to do instead.
Read the answer →Chi-square goodness of fit vs test of independence: what is the difference?
Both tests use the same Pearson formula. What differs is the question, where the expected counts come from, and so the degrees of freedom.
Read the answer →Chi-square test with expected counts below 5: what should you do?
What the rule of 5 really checks, when sparse cells matter, and how Fisher's exact test or a Monte Carlo p value fixes 2x2 and larger tables.
Read the answer →How do you test whether event counts vary by month?
A chi-square goodness-of-fit test weighted by month length, its blind spots, and a Poisson regression that tests one seasonal wave on 2 df.
Read the answer →How do you compare a short ordinal rating scale between two groups?
t test, Mann-Whitney or chi-square for a 1-4 rating item: what each one tests, how they compare in a simulation, and how to report the result.
Read the answer →Is the chi-square test one-tailed or two-tailed?
Why a chi-square test reads only the right end of its curve yet detects differences in any direction, and why its p value is never halved.
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