The evaluation of labor market policies has become an important issue in many Europeancountries. In recent years, a number of them have opened their administrative databases forevaluation studies. The advantages of administrative data are straightforward: they areaccurate, contain a large number...

This paper assesses the dynamics of treatment effects arising from variation in the durationof training. We use German administrative data that have the extraordinary feature that theamount of treatment varies continuously from 10 days to 395 days (i.e. 13 months). Thisfeature allows us to...

This study analyzes the treatment effects of public training programs for the unemployed inGermany. Based on propensity score matching methods we extend the picture that has beensketched in previous studies by estimating treatment effects of medium-term programs fordifferent sub-groups with...

Many statistical applications require an estimate of a covariance matrix and/or its inverse.When the matrix dimension is large compared to the sample size, which happensfrequently, the sample covariance matrix is known to perform poorly and may suffer fromill-conditioning. There already exists...