Claims

JOBSTART's completion gain came entirely from GED receipt, with a small significant negative effect on earning a high school diploma

Claim · All claims
Evidence · 1 study (2 entries) · causal r2 · q3 · i1–i2
Currency · newest study 2008 · not yet checked against its sources · 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.

q3 i2 JOBSTART had a statistically significant positive effect on earning a GED certificate (37.6% vs. 21.1%; effect size 0.49; improvement index +19). → What Works Clearinghouse 2008 q3 i1 JOBSTART had a small, statistically significant negative effect on the likelihood of earning a high school diploma (4.4% vs. 7.5%; effect size -0.34; improvement index -13). → What Works Clearinghouse 2008 (2)

Evidence

What Works Clearinghouse 2008

What Works Clearinghouse. (2008). WWC Intervention Report: JOBSTART. U.S. Department of Education, What Works Clearinghouse. https://ies.ed.gov/ncee/wwc

q3 · i2 · causal · r2

48-month follow-up of the Cave et al. (1993) randomized controlled trial; Appendix A4.2 reports GED receipt of 37.6% for JOBSTART versus 21.1% for control, mean difference 16.5, effect size 0.49, statistically significant.

"This positive effect on comple-tion came entirely from JOBSTART's positive and statistically significant effect on receiving a GED certificate."

What Works Clearinghouse 2008 (2)

What Works Clearinghouse. (2008). WWC Intervention Report: JOBSTART. U.S. Department of Education, What Works Clearinghouse. https://ies.ed.gov/ncee/wwc

q3 · i1 · causal · r2

Same 48-month follow-up of the randomized controlled trial; footnote 6 reports diploma percentages of "4.4% and 7.5% respectively" for JOBSTART and control, and Appendix A4.2 gives effect size -0.34, statistically significant, improvement index -13.

"JOBSTART was found to have a small, but statistically significant, negative effect on the likelihood of earning a high school diploma."

Discussion

Page metadata
Field Value
type claim
id jobstart-ged-gain-diploma-negative-effect
title JOBSTART's completion gain came entirely from GED receipt, with a small significant negative effect on earning a high school diploma
description JOBSTART's completion gain came entirely from GED receipt, with a small significant negative effect on earning a high school diploma
status review
evidence_strength mixed
newest_evidence 2008
generated by process:wiki-ingest on 2026-10-09
trust unverified — no one has confirmed this page's content
sources 2 — what-works-clearinghouse-2008, what-works-clearinghouse-2008-2

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