More Information
For more information on how the national estimates were produced, refer to:
Hedges, L. V. & Hedberg, E. C. (2007). Intraclass correlations for planning group-randomized experiments in education.
Educational Evaluation and Policy Analysis, 29, 60-87
For more information on how the state estimates were produced, refer to:
Hedges, L. V. & Hedberg, E. C. (2014). Intraclass correlations and covariate outcome correlations for planning 2 and 3
level cluster randomized experiments in education. Evaluation Review.
