Tukeys Multiple Comparison Test. The first row that compares group 1 to each of the remaining groups shows that there is no. The following code provides the numerical and graphical 30 results of applying Tukeys HSD to the linear model for the Guinea Pig data.
However there is an approximate procedure called the Tukey-Kramer test for unequal n i. However well try and back that up with a more formal test. If you are looking at all pairwise comparisons then Tukeys exact procedure is probably the best procedure to use.
The Bonferroni however is a good general procedure.
Using Tukeys method you specify that the entire set of comparisons should have a family error rate of 005 equivalent to a 95 simultaneous confidence level. It just means do all pairwise comparisons. Perform a multiple comparison test to see the popcorn yield differs between the two popper. Sep 14 2020 perform Tukeys Test TukeyHSD model conflevel95 Tukey multiple comparisons of means 95 family-wise confidence level Fit.
