Survival Analysis in Product Life Cycle Investigations: An Assessment of Robustness for the German Automobile Industry
نویسنده
چکیده
We apply various re nements of survival regression to assess the results of some basic speci cations based on product life cycle theory for the case of a data set of the German automobile industry. The methods applied pay attention to biases in the coe cient estimates and the standard errors, the discrete nature of the duration data and the presence of unobserved heterogeneity. Robust estimation methods are also applied. We nd that that the coe cient estimates and standard errors are not much a ected by applying the re ned estimators. The substantial results of a previous study with the same data are unchanged. JEL classi cation: C41, C25, C14, L10, L62, O33
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