Tag

unobserved_heterogeneity

2 cards

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.
Methods & evidenceExpert Theory
Mixed Proportional Hazard (MPH) Model
The MPH framework isolated a 20% to 40% time-varying increase in unemployment escape rates attributable to the policy regime, preventing bias from a small sub-population (1-2%) of unobserved 'immune' individuals with zero exit probability.