Statistically significant effects reported by the CDP studies were not statistically significant as recalculated by the WWC¶
Claim · All claims
Evidence · 1 study · causalr2·q2
Currency · newest study 2007 · checked against its sources 2026-10-20 (automated, 1 of 1 entry) · not reviewed by a person
Subclaims¶
Reading the evidence codes
q is the design tier, i the impact, n the sample, and the kind with its r
the rigour judged within that kind: what each code means.
This claim: no standardized effect is recorded in observations/ for it yet, so no benchmark reading is possible.
q2 i? In the Six-District Study, reported significant effects on alcohol and marijuana use were not statistically significant after WWC corrections for clustering and multiple comparisons. → What Works Clearinghouse 2007
Evidence¶
What Works Clearinghouse 2007¶
What Works Clearinghouse. (2007). Caring School Community™ WWC Intervention Report, Character Education. U.S. Department of Education. http://www.devstu.org/csrd/cdp_index.html
q2 · i? · causal · r2
WWC re-analysis of the Six-District quasi-experimental study of CDP, which examined altruistic behavior and 19 indicators of problem behavior and victimization. The report states "none of these outcomes were statistically significant as calculated by the WWC" after corrections for clustering and multiple comparisons.
"The study reported statistically significant effects for two outcomes (use of alcohol and use of marijuana). However, none of these outcomes were statistically significant as calculated by the WWC."
Discussion¶
Related Claims¶
- Positive Action has positive effects on elementary school students' behavior, with a WWC domain average effect size of 0.51 and an improvement index of +19 percentile points — the general claim this finding bears on, with the studies behind it
- Chambers et al. report a statistically significant expressive language effect for 3-year-olds but not 4-year-olds, which WWC recalculation does not confirm — related
- Effects on behavioral intentions for marijuana use and fighting were not statistically significant in either study — related
- Author-reported statistically significant program effects did not remain significant after WWC corrections for clustering and multiple comparisons — a broader claim this one bears on
- Three of seven knowledge, attitudes, and values outcomes favor Facing History and Ourselves, including relationship maturity (best response) with effect size 0.45, but none remain statistically significant after WWC corrections — related
- The WWC rated Waterford Early Reading Program™ as having potentially positive effects on alphabetics, based on a substantively important average effect size with no statistically significant individual outcomes — related
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- No individual alphabetics outcome reached statistical significance in the WWC analysis — related
- Nunnery and Ross (2007) reported significant grade 5 but not grade 8 TAAS effects, which were non-significant in WWC recalculation — related
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
wwc-recalculation-nullifies-reported-cdp-effects |
title |
Statistically significant effects reported by the CDP studies were not statistically significant as recalculated by the WWC |
description |
Statistically significant effects reported by the CDP studies were not statistically significant as recalculated by the WWC |
status |
review |
evidence_strength |
weak |
newest_evidence |
2007 |
source_checked |
2026-10-20 |
generated |
by process:wiki-ingest on 2026-10-07 |
trust |
unverified — no one has confirmed this page's content |
sources |
1 — what-works-clearinghouse-2007 |
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