Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Coefficient estimates in the model stability analysis that examines the relative impact of dropping out a subset of the data. Notes: Dependent variable is middle letter improvement. Predictors are middle letter exposure, letter frequency, letter complexity, and pretest performance. All coefficient estimates presented in the table are significantly different from zero. Coefficient estimates based on all groups with and without the interaction term are also presented here as references.
