WWC standards

Standardized effect size (you can also use this for baseline equivalence test).

This looks like a test of two means, but you can also use it to test binary variables (you will need to fill in an SD value with any number).


Two versions, but the same results.




Algorithms for Standardized Group Difference


Page 16.


Baseline Equivalence


Page 54.

0.00 <= baseline ES <= 0.05 Satisfies BE
0.05 < baseline ES <= 0.25 with covariates baseline ES > 0.25 Fails


Attrition (Page 10 of https://ies.ed.gov/ncee/wwc/Docs/referenceresources/WWC-Standards-Handbook-v4-1-508.pdf )