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Table 3. Bootstrapping Results for Indirect Effects of Collaboration on the Relationship
between Principal Leadership and Teacher Professional Learning
Bootstrap Indirect Effects of IV Bias Corrected Bias Corrected Percentile
Results for on DV through Confidence
Indirect Mediators and Confidence
Effects Intervals
Accelerated Intervals
Confidence
Intervals
Boot SE Boot Boot Lower Upper Lower Upper Lower Upper
Mean LLCI ULCI
Collaboration .157 .023 .112 .204 .112 .203 .112 .203 .111 .202
Effect Size Indices for Indirect Effects Effect Boot SE Boot LLCI Boot ULCI
.074
Ratio of Indirect to total effect of X on Y (ab/c) .736 17.526 .609 .905
Ratio of Indirect to total effect of X on Y (ab/c?? 2.792 .019
.030 1.550 9.114
R-squared mediation effect size .701 .037 .111
Preacher and Kelley (2011) Kappa-squared .242 .183 .302
Notes:
1. Boot Mean: The indirect effect calculated in the original sample.
2. Boot SE: The mean of the indirect effect estimates calculated across all bootstrap samples.
3. Boot LLCI: The lower limit of the 95% confidence intervals for population value of the indirect effects.
4. Boot UCLI: The upper limit of the 95% confidence intervals for population value of the indirect effects.
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