Abstract: We propose a semiparametric model including problems of sample selection and endogeneity. Concretely, we focus on studying the effect of tenure in public sector wages. Here we face two problems: Public wages are only observed for public employees and the tenure is endogenous. The chosen method allows the introduction of a nonparametric control function and relaxing usual strong assumptions. This approach is applied to a wage model for the Spanish Public Sector, using the wage structure survey of 2016

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