Chi-square now pools the smallest category into Other one at a time until
every expected count is at least five (rows too, for independence), so a
crosstab with a single-record row still gets a valid test.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Extension 1.2.0: compare two filters field by field with deltas and
significance (two-proportion z, Welch's t, chi-square with validity
rules and plain sentences), distribution shift over time with PSI, a
pushed-down Pearson correlation matrix with sampled scatter and trend,
and crosstabs with chi-square and Cramer's V. Pure-Java statistics
checked against scipy reference values; the privacy guard, field access
and drills apply as for profiles.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
james.maesandClaude Opus 5.5