Tag

duration_models

2 cards

Methods & evidenceExpert Theory
Dynamic Selection Bias in Duration Models
Uncorrected raw Kaplan-Meier hazard rates provide only a lower bound on treatment efficacy due to dynamic selection, whereas MPH duration models correctly isolate true 20–40% exit rate increases.
Methods & evidenceRCT
Immune Subpopulation in Unobserved Heterogeneity
Model estimations consistently identified a distinct subpopulation of 1% to 2% 'immune' individuals exhibiting a zero exit rate from unemployment, whose separation was required to accurately identify policy impacts among the remaining population.