At the heart of a new product sales-forecasting model for consumer packaged goods is a multiple-event timing process. Even after controlling for the effects of time-varying marketing mix covariates, this timing process is not a stationary one, which means the standard interpurchase time models...

While there is a growing literature on investigating the Internet clickstream data collected for a single site, such datasets are inherently incomplete because they generally do not capture shopping behavior across multiple websites. A customer's visit patterns at one or more other sites may...

In the mid-1980s, several European countries, characterized by high levels of employment protection, introduced fixed-term contracts. Since then most accessions to employment have been through fixed-term contracts. This Paper studies the duration pattern of fixed-term contracts and the...

In the mid-1980s, several European countries, characterized by high levels of employment protection, introduced fixed-term contracts. Since then most accessions to employment have been through fixed-term contracts. This paper studies the duration pattern of fixed-term contracts and the...

In this paper we present an empirical structural job search model with endogenously determined search intensity. The model describes both the behaviour of unemployed job searchers and on-the-job search. We use data on various indicators (or search channels) for the intensity of search, like the...

In the mid-1980s,most accessions to permanent employment in several European countries have been through fixed-term contracts. This paper studies the duration pattern of fixed-term contracts and the determinants of their conversion into permanent ones in Spain, where the share of fixed-term...

Walker (1997) criticizes one of the conclusions in my book Ta\c{s}\iran (1995), that Heckman and Walker's very high negative wage rate and positive income effects on Swedish fertility are very sensitive. In this paper, I explain, first, that my results are not only based on the series Walker...