The WWC-computed average effect size for Reading Mastery on ELL reading achievement is 0.76, corresponding to an improvement index of +28 percentile points¶

Claim · All claims
Evidence · 1 study · causal r? · q3 · i2 medium
Currency · newest study 2006 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q3 i2 Across the three rated immediate posttest findings, the WWC-computed domain average effect size for reading achievement is 0.76, with an improvement index of +28 percentile points (range +21 to +35). → WWC Intervention Report: Reading Mastery SRA/McGraw-Hill 2006

Evidence¶

WWC Intervention Report: Reading Mastery SRA/McGraw-Hill 2006¶

WWC Intervention Report: Reading Mastery SRA/McGraw-Hill. (2006). What Works Clearinghouse, U.S. Department of Education. https://ies.ed.gov/ncee/wwc

q3 · i2 · causal · r?

Appendix A3 of the WWC report prints the domain average row for reading achievement as an effect size of 0.76 and improvement index +28, computed as a simple average rounded to two decimal places across Oral Reading Fluency (+35), Letter-Word Identification (+21), and Word Attack (+26). The effectiveness summary page states an average of +28 with range +21 to +35; the improvement index section states +27.

"The average improvement index for reading achievement is +27 percentile points, with a range of +21 to +35 percentile points across findings."

Discussion¶

Related Claims¶

• The WWC improvement index is +31 percentile points for English language development and +3 percentile points for reading achievement — related