Discontinuous Skill Certification Effect
Determining whether labor market gains stem from human capital enhancements during evaluation or from the discrete informational value of official certificates requires isolating threshold signaling effects.
Picture this
Imagine two students scoring 89% and 90% on a test where 90% earns an official "Honor Roll" badge—despite almost identical knowledge, the student with the "Honor Roll" badge receives far more job offers because employers rely on discrete badges. Grouping continuous skill scores into discrete performance bands proves that official certificates directly boost worker earnings by providing standardized badges to employers.
What the evidence says
Being placed in a higher performance band generated a wage increase of 0.322 standard deviations at twice the optimal bandwidth (p < 0.10) and 0.332 standard deviations at the optimal bandwidth (p = 0.13).
- Who
- N = 246 (optimal bandwidth) to N = 304 (2x optimal bandwidth) workshop participants in Addis Ababa, Ethiopia.
- How
- Regression Discontinuity Design (RDD) pooling normalized score cut-offs across discrete certificate bands.
What to do
Group continuous applicant assessment scores into discrete performance bands on credentials to leverage threshold signaling effects for job-seekers.
From the source
"We find that being placed in a higher band generates a large, but noisily estimated increase in wages in 2018... the effect is consistently between 0.2 and 0.3 standard deviations and is significant at the 10 percent level when we use the larger bandwidth."
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