Tests and confidence intervals for the spread of datasets

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Tests and confidence intervals for the spread of datasets

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One-sample chi-square variance test - Tests if a sample comes from a Normal distribution with specified variance, against the alternative that it comes from a Normal distribution with a different variance

F-test for ratio of two variances - Tests if two independent samples come from Normal distributions with the same variance, against the alternative that they come from Normal distributions with different variances

Bartlett's M test for homogeneity of variances - Tests if multiple samples come from Normal distributions with the same variance, against the alternative that they come from Normal distributions with different variances

Levene-Brown-Forsythe test - This test is a variant on the standard one-way analysis of variance (ANOVA) test, but is applied when the variances of the groups are not homogeneous

Fligner-Killeen median test - A test for homogeneity of variances which is robust against departures from Normality