In this paper we analyse the effects of human capital in fostering output growth in ICT manufacturing and services using data from a sample of twenty OECD countries over the period 1980-2002. We focus on within country between industry differences and control for country and industry specific...

We derive asymptotic properties of estimators and test statistics to determine - in a grouped data setting - common versus group-specific factors. Despite the fact that our test statistic for the number of common factors, under the null, involves a parameter at the boundary (related to unit...