We analyse models in which additional "controls" or proxies are included in a regression. This might occur intentionally if there is significant measurement error in a key regressor or if a key variable is not measured at all. We develop a test of the hypothesis that a subset of the regressors...

We investigate the time allocation decisions by South African learners using the South African Time Use Survey. We show that punctuality appears to be a problem with around 20% of all learners seeming to arrive late. Punctuality and absenteeism seem to be problems disproportionately among poor...

This paper compares estimates of total manufacturing employment from South Africa's 1996 manufacturing census, the 1996 population census and the October Household Surveys from 1995, 1996 and 1997. Findings show that there are 300 000 too few manufacturing workers recorded in the 1996 population...