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A Note on the Weibull Distribution and Time Aggregation Bias

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Forfattere:

Røed, Knut og Tao Zhang

År:

2000

Referanse:

Memorandum
Nummer i serie: 23

Summary

The application of continuous time Weibull models on discrete unemployment duration data may produce bias in the estimated shape of the hazard rate. The bias can be substantial even for weekly duration data, and it is seriously aggravated if the Weibull model is erroneously mixed with a Gamma distribution for unobserved heterogeneity.

Nøkkelord:

Unemployment duration, Weibull model, Time aggregation bias

JEL:

C41

Prosjekt info:

Oppdragsgiver: Norges forskningsråd
Oppdragsgivers prosjektnr.:
Frisch prosjekt: 1203 - Sortering, utsatte grupper og arbeidsmarkedstiltak

Finansiering:

Norges forskningsråd