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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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