Sex differentials in the earnings of Ph.D.s.

Using a survey of two cohorts of men and women who received Ph.D.s in the years 1958-63 and 1967-72, the authors test two hypotheses: (1) that the relatively lower earnings of highly educated women can be explained largely by their career interruptions and by their lesser willingness to accumulate human capital in anticipation of such interruptions, and (2) that the differential in earnings between men and women increases with age because of career interruptions and that the gap narrows once women reenter the labor force on a permanent basis The findings do not lend support to either of these hypotheses, leading the authors to reject the proposition that the lower rewards of women Ph.D.s are primarily caused by their own voluntary decisions.     

Ford in U.K. Car-tel?

The British car industry has long been suspected of provoking higher prices by restricting the importation of cheaper models. Four oconomists at the Poiytechnic of Central London arguo for the revision of UK design copyright laws to increase competition.     

U.S. productivity in agriculture and R&D

This paper examines the impact of R&D on multifactor productivity in the U.S. agricultural sector over the 1910–1990 period. We use the Bennet–Bowley indicator to measure agricultural productivity based on a multiple output-multiple input technology. We demonstrate the relationship between the price dependent Bennet–Bowley indicator and the Luenberger productivity indicator which is constructed from directional distance functions without requiring price information. These performance measures are dual to the profit function which arguably makes them especially useful in the agricultural setting. We employ time-series techniques to investigate the effect of R&D on the pattern of productivity growth. We find that we cannot reject the presence of a cointegrating relationship between the two series and that productivity growth in the U.S. agriculture responds positively to R&D expenditure with a lag of between four and ten periods.

Recent Ph.D. Theses in the Netherlands

Statistica Neerlandica encourages the reporting on theses in probability, statistics, biometrics, econometrics, and operations research, submitted to Dutch universities. The main purpose of this section is to inform the reader briefly of the nature, the practical and theoretical importance, the methods used, and the results presented in recent theses.
Notes (not exceeding 300 words) should be sent to the column editor, preferably in LATEX by electronic mail.     

Recent Ph.D. Theses in the Netherlands

Statistica Neerlandica has decided to encourage the reporting on theses in probability, statistics, biometrics, econometrics, and operations research, submitted to Dutch universities. The main purpose of this section is to inform the reader briefly of the nature, the practical and theoretical importance, the methods used, and the results presented in recent theses. It is understood that contributions to this section meet with the approval of the supervisor(s) of the thesis.
Notes (not exceeding 300 words) should be sent to the column editor.     

Recent Ph.D. Theses in the Netherlands

Statistica Neerlandica encourages the reporting on theses in probability, statistics, biometrics, econometrics, and operations research, submitted to Dutch universities. The main purpose of this section is to inform the reader briefly of the nature, the practical and theoretical importance, the methods used, and the results presented in recent theses. It is understood that contributions to this section meet with the approval of the supervisor(s) of the thesis.
Notes (not exceeding 300 words) should be sent to the column editor.