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Workbook 24 sphericity and homogeneity of variance as

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Workbook 24 Sphericity and Homogeneity of Variance . As measures are repeated they are considered by default to not be independent; thus, Mauchly’s test of sphericity (Edwards, 1993) was performed to insure equal correlations among treatment pairs. Furthermore, Levene’s test (Draper, 1998) for homogeneity of variance was consulted at appropriate times. No violations of these assumptions were indicated at anytime throughout the analysis and specific results are included in the following findings. Findings The repeated measures ANOVA multivariate test indicated that while time and the interaction of time and treatment status captured significant amounts of the variance in reframe effectiveness, initial level of dysfunctional career thinking did not ( Table 9 ). Time of data collection accounted for 28.7% of the variance in effectiveness of reframed dysfunctional career thoughts ( F = 15.726, 2, p < .001). The interaction between time and treatment status accounted for 19.2% of the variance in reframed dysfunctional career thoughts ( F = 9.273, 2, p < .001). Initial level of dysfunctional career thinking, as measured by the CTI screener, was not found to capture significant variance when combined with time and/or treatment status (1.4% of variance, F = .568, 2, p = .569 and .7% of variance, F = .280, 2, p = .757 respectively). Furthermore, the assumption of equal correlations among treatment pairs of the dependent measure was met ( W = . 989, 2 = .835, 2, p = .659). As the variable of initial level of dysfunctional career thoughts did not demonstrate a statistically significant effect, it was removed from the analysis. This decision dictated the inclusion of an additional subject for which CTI screening data was missing. Thus, an additional repeated measures ANOVA with only treatment status as the between subjects variable and time as the within subjects variable was conducted on the entire sample ( Table 10 ). This yielded
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Workbook 25 differences in the amount of variance accounted for by the independent variables. In this new analysis, time accounted for 29% of the variance in effectiveness of reframed dysfunctional career thoughts ( F = 16.546, 2, p < .001) and the interaction between time and treatment status accounted for 18.2% of the variance in reframed dysfunctional career thoughts ( F = 9.016, 2, p < .001). Again, the assumption of equal correlations among treatment pairs of the dependent measure was met ( W = .987, 2 = 1.031, 2, p = .59). Additional testing using ANOVA’s with Student-Neuman-Keuls control of family wise error confirmed the within subjects effect of time ( F = 16.726, p < .001) and interaction of Time and Treatment status ( F = 9.655, p < .001). Furthermore, post hoc contrasts between pretest and posttest and posttest and delayed posttest were also found to be significant ( p < .01 or better) ( Table 11 ). Given the interaction found between Time and Group, individual post hoc tests of reframe effectiveness between groups at each time were conducted using Student-Neuman-Keuls ( Table 12 ). Levene's test for equality of error variances across dependent measures was met for these tests (smallest p > .145). No significant differences were found between treatment and
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  • Fall '19
  • Statistical significance, Effect size, cti, James P. Sampson, Reframes

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