The most critical factor in econometric estimations is parameter identification. Identification in econometric models formalizes prior assumptions and the data to information about a parameter of interest. However, there are two important features characterize duration data. The first one is...

We study accelerated failure time models in which the survivor function of the error term is log-concave. The log-concavity assumption is often implied by the underlying economic models and covers large families of commonly used distributions. For right-censored failure time data, we construct...

In this paper I analyze the correlation between the licensing activity by start-ups and established firms (mainly in the biotech sector) and the inventions’ stages of development. Using data from the San Diego region on licensing new technologies and a new variable to characterize the...

This paper studies identification and inference in transformation models with endogenous censoring. Many kinds of duration models, such as the accelerated failure time model, proportional hazard model, and mixed proportional hazard model, can be viewed as transformation models. I allow the...

This paper tries to identify, for the first time, a chronology for the Portuguese stock market cycle and test for the presence of duration dependence in bull and bear markets. A duration dependent Markov-switching model is estimated over monthly growth rates of the Portuguese Stock Index for the...

This paper tries to identify, for the first time, a chronology for the Portuguese business cycle and test for the presence of duration dependence in the respective phases of expansion and contraction. A duration dependent Markov-switching vector autoregressive model is employed in that task....

Members of online communities access consumption related information posted by several other members. Over time, members are influenced by some members of the community, and develop informal relationships with them. We propose a model for the timing of the establishment of relationships between...

This paper suggests simple 3- and 4-step estimators for censored quantile regression models with an envelope or a separation restriction on the censoring probability. The estimators are theoretically attractive (asymptotically as efficient as the celebrated Powell's censored least absolute...

This paper argues that the duration between successive children affects child survival (the sibling competition effect) while child survival too affects the duration between successive births (the child replacement effect). This inter-relationship is modelled in terms of a correlated...

We consider a dependent competing risks model with many risks and many covariates. We show identifiability of the marginal distributions of latent variables for a given dependence structure. Instead of directly estimating these distributions, we suggest a plug-in regression framework for the...