Multiple large fixed-effects studies across NC, FL, TX, and LA find advanced degrees and licensure have near-zero or slightly negative effects on student outcomes.
Key Takeaways
Ladd and Sorensen (2015, NC admin data) found Master’s degrees had no effect on student achievement; only high absenteeism rates shifted slightly.
Harris and Sass (FL) found years of experience mattered marginally in elementary/middle school but were null or negative in high school; all other credentials were meager.
Buddin and Zamarro (LA elementary) found student- and teacher-fixed-effects made advanced degrees null to negative; licensure tests (CBEST, CSET) appeared slightly harmful.
Sancassani’s international within-student/within-teacher model found subject-matched degrees boosted scores by only 0.035 SD, with larger effects only in less-developed countries.
The consistent message across replications: credentials, experience, professional development, and union requirements have at best limited effects on student outcomes.
Hacker News Comment Review
Commenters broadly agreed credentials are a poor proxy for teaching ability, with some arguing no degree should be required at all, only demonstrated job competence.
The salary angle surfaced as a structural constraint: starting pay around $48k makes demanding advanced degrees unrealistic without meaningful compensation adjustments.
No commenter offered alternative selection criteria beyond vague appeals to personality or ability, leaving the “if not credentials, then what” question open.
Notable Comments
@globalnode: Notes that studies show even experience is irrelevant, raising the unanswered question of what teacher quality actually predicts.
@lmm: Points out teachers already earn more than adjunct professors and grad students, the typical advanced-degree holders in education.
