This book, produced jointly by the World Bank, the University of California, Berkeley, and the WHO, aims to provide decision-makers at sub-national, national, regional and global levels with additional insights into how to address their workforce challenges rather than describe them. In order to...

Researchers have increasingly realized the need to account for within-group dependence in estimating standard errors of regression parameter estimates. The usual solution is to calculate cluster-robust standard errors that permit heteroskedasticity and within-cluster error correlation, but...