Estimated Marginal Means: Ship Type
This table displays the model-estimated marginal means, standard errors, and confidence intervals for the linear predictor of Number of damage incidents at the factor levels of Ship type. This table is useful for exploring the differences between the levels of this factor. In this example, the linear predictor ranges from a low of -6.409 for ship type C to a high of -5.396 for ship type E. To see whether the values in this table represent real differences or are likely due to chance variation, look at the test results.
The pairwise comparisons table displays the differences between each pair of ship types and tests whether each difference between ship types is due to chance variation.
Though the parameter estimates table shows a statistically significant difference (p value 0.019) in the damage rate between ship types A and B, this is not the case in the pairwise comparisons table (p value 0.156, adjusted by the sequential Sidak method). The p values reported in the parameter estimates table are unadjusted for multiple comparisons.
The pairwise comparisons reveal that ship type B has a statistically significantly lower damage rate than ship type E. There are no other significant differences.
The overall test table reports the results of a test of all of the contrasts in the pairwise comparisons table. Since there are no interaction effects involving Ship type, this test is equivalent to the model effects test for Ship type.