Fable Code Review

This release incorporates a code review from Fable via Cursor, looking at error handling additional testing, refactoring and security issues.

v0.2 - Single Functions with JSON response

Updated v0.1 list of individual functions per family to consolidate into generally a single function with JSON response.

Initial Version

First version of the statistical aggregate functions for data scientists — IQR, quartiles, outlier detection, two-sample t-tests, one-sample z-tests, mode, skewness, kurtosis, covariance, chi-squared tests, robust/ratio means, and one-way ANOVA.

Summary

Family	Count	Functions
IQR	6	STATS_IQR, STATS_Q1, STATS_Q3, STATS_MEDIAN, STATS_IQR_LOWER_FENCE, STATS_IQR_UPPER_FENCE
T-test	7	STATS_TTEST_T, STATS_TTEST_DF, STATS_TTEST_POOLED_VAR, STATS_TTEST_P_ONE_TAIL, STATS_TTEST_P_TWO_TAIL, STATS_TTEST_T_CRIT_ONE_TAIL, STATS_TTEST_T_CRIT_TWO_TAIL
Mode	3	STATS_MODE, STATS_MODE_MIN, STATS_MODE_MAX
Skewness	2	STATS_SKEWNESS, STATS_SKEWNESS_PEARSON
Z-test	3	STATS_ZTEST_Z, STATS_ZTEST_P_ONE_TAIL, STATS_ZTEST_P_TWO_TAIL
Chi-squared	5	STATS_CHISQ_GOF, STATS_CHISQ_GOF_DF, STATS_CHISQ_GOF_P, STATS_CHISQ_INDEP, STATS_CHISQ_INDEP_P
Kurtosis	2	STATS_KURTOSIS, STATS_KURTOSIS_EXCESS
Covariance	2	STATS_COVARIANCE_POP, STATS_COVARIANCE_SAMP
Means	4	STATS_MEAN_TRIMMED, STATS_MEAN_WINSORIZED, STATS_MEAN_GEOMETRIC, STATS_MEAN_HARMONIC
ANOVA	9	STATS_ANOVA_F, STATS_ANOVA_P, STATS_ANOVA_SSB, STATS_ANOVA_SSW, STATS_ANOVA_SST, STATS_ANOVA_MSB, STATS_ANOVA_MSW, STATS_ANOVA_DFB, STATS_ANOVA_DFW
Total	43

Beta notice: All functions in this extension (STATS_IQR, STATS_TTEST_*, STATS_MODE, STATS_SKEWNESS, STATS_ZTEST_*, STATS_CHISQ_*, STATS_KURTOSIS*, STATS_COVARIANCE_*, STATS_MEAN_*, STATS_ANOVA_*) are beta quality. They are functionally correct on the tested datasets but have not been validated at production scale. Use with caution in high-volume or precision-critical workloads and report any anomalies.