![]() ![]() ![]() The last column of the matrix contains the p-values.įor example, the first row of the matrix shows that the combination of level 1 of g1 and level hi of g2 has the same mean response values as the combination of level 2 of g1 and level hi of g2. Similarly, the number 3 corresponds to the combination of level 1 of g1 and level lo of g2, and the number 4 corresponds to the combination of level 2 of g1 and level lo of g2. In the results matrix, the number 1 corresponds to the combination of level 1 of g1 and level hi of g2, the number 2 corresponds to the combination of level 2 of g1 and level hi of g2. Multcompare compares the combinations of groups (levels) of the two grouping variables, g1 and g2. Select other group means to confirm that all group means are significantly different from each other. This lack of intersection indicates that both means are different than group 1 mean. Because the comparison intervals for the other two groups do not intersect with the intervals for the group 1 mean, they are highlighted in red. By default, the group 1 mean is highlighted and the comparison interval is in blue. The figure shows the multiple comparison of the means. All p-values (0, 0, and 0.0116) are very small, which indicates that the popcorn yield differs across all three brands. The sixth column contains the p-value for a hypothesis test that the corresponding mean difference is equal to zero. The third and fifth columns show the lower and upper limits for 95% confidence intervals for the true mean difference. The fourth column shows the difference between the estimated group means. The first two columns of c show the groups that are compared. ![]()
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