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Any confidence intervals that do not contain 0 provide evidence of a difference in the groups. Pairs with a positive value are statistically significantly different at the specified alpha significance level. Conduct tukey's hsd test for multiple pairwise comparisons after anova Free calculator with critical differences and confidence intervals. One of the most widely used post hoc methods is tukey’s honest significant difference (hsd) test This article serves as an essential guide to understanding, applying, and interpreting tukey’s hsd in post hoc analysis. Examples and software are provided. An anova test can tell you if your results are significant overall, but it won’t tell you exactly where those differences lie. Performs tukey's honest significant difference (hsd) test for all pairwise comparisons after fitting an anova model This post hoc method uses the studentized range distribution and is appropriate when variances are equal across groups and observations are independent. Perform tukey’s hsd test for equality of means over multiple treatments Tukey’s honestly significant difference (hsd) test performs pairwise comparison of means for a set of samples. Learn how to apply tukey’s honestly significant difference (hsd) test after anova to identify which group means differ significantly.