In vocational education and training, it can be assumed that the digital transformation increases the relevance of individuals' cross-occupational collaboration competency (COCC) across vocational and professional sectors, thus improving and reorganizing processes across time and domains on the...

In empirical studies, the data usually don't include all the variables of interest in an economic model. This paper shows the identification of unobserved variables in observations at the population level. When the observables are distinct in each observation, there exists a function mapping...