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The next stage was to perform multiple comparisons for those cases where the Kruskal-Wallis test was found to be significant. The Scheffe test (at an alpha level of 0.05) was used to show which companies' groups had statistically significant differences. This particular test was selected because it is considered robust to deviations from normality or homogeneous variance (Johnson, 1998). Furthermore, equal sample sizes are not required for this test. However, multiple comparisons tests (like the Scheffe test) are not as powerful as the Kruskal-Wallis test. Lack of power means that type II errors happen more often with multiple comparisons tests (Zar, 1999). For that reason, the Scheffe test was unable to detect statistically significant differences between groups in some cases after the Kruskal-Wallis test was found to be significant. 4.1.12. Differences between Companies that Dry Softwoods and Hardwoods Three groups were created in this case. In particular the groups were: 1. Companies that dried only softwoods 2. Companies that dried only hardwoods 3. Companies that dried both softwoods and hardwoods Figure 11 presents mean values of dried product quality issues for companies that dried softwoods, hardwoods or both softwoods and hardwoods. In general, hardwood operations faced more serious dried product quality problems, compared to those operations that dried softwoods or both softwoods and hardwoods. However, softwood companies had more serious problems with moisture content related dried product quality issues, compared to those companies that dried hardwoods or both softwoods and hardwoods. 60PDF Image | KILN DRYING PROBLEMS AND ISSUES IN CANADA
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