Alvarez, Fernando; Borovičkova, Katarina; Shimer, Robert - National Bureau of Economic Research - 2021
We develop an estimator and tests of a discrete time mixed proportional hazard (MPH) model of duration with unobserved … heterogeneity. We allow for competing risks, observable characteristics, and censoring, and we use linear GMM, making estimation and … distribution. We apply our estimator to the duration of price spells in weekly store data from IRI. We find substantial unobserved …