| SOURCE: Spring 2009 Teacher Knowledge Test (Second Year Teacher Impact Analysis Sample). |
| NOTES: The impact analyses for teacher knowledge were conducted using measures scaled in logits. The estimated impacts are based on a two-level model controlling for random assignment block and teacher-level covariates. |
| The figure displays regression-adjusted mean outcomes for each group, using the mean covariate values for teachers in the treatment group as the basis for the adjustment. |
| The values for the percent correctly answering items of average difficulty for the test instrument correspond to the estimated treatment and control group means, scaled in logits. |
| P-values are based on t-tests. Two-tailed statistical significance at the p ≤ .05 level is indicated by an asterisk (*). |
