Exhilarating,Exhausting, Intriguing: The Report of the Africa Commission

Book reviewed: Our Common Interest: The Report of the Africa Commission. By the Commission for Africa. London: Commission for Africa, 2005. 462pp. £10.00 pb. (forthcoming in June 2005 from Penguin Books Ltd, Our Common Interest: An Argument. 192pp. £5.00 pb.).     

Building cultural intelligence: insights from project management job advertisements

This paper examines how organisations that conduct worldwide recruitment of project management professionals can derive insight from the cultural preferences stated within project management job advertisements. Drawing on project management practitioner job advertisements placed by 2040 organisations across seven countries and seven industries, we employ Hofstede’s national cultural framework to categorise cultural preferences which the organisations persistently replicate in their specifications of desired candidate project management practitioner competency. To map global trends and national variations, data analysis is undertaking and utilising exploratory data analysis, Poisson regression and negative binomial regression are used. The paper finds that specific national cultural dimensions – ‘Collectivism’, ‘Uncertainty Avoidance’ and, to a lesser extent, ‘Power Distance’ – are the most salient cultural denominators for advertised project management positions, while this is not the case with ‘Masculinity’ and ‘Individualism’. The findings raise issues about which organisations should seek to become more culturally intelligent, and which relate to the adaptiveness of the cultural preferences that they articulate through their job advertisements, both to project tasks and to cultural contexts for projects.     

The application of the durbin-watson test to the dynamic regression model under normal and non-normal errors

Until recently, a difficulty with applying the Durbin-Watson (DW) test to the dynamic linear regression model has been the lack of appropriate critical values. Inder (1986) used a modified small-disturbance distribution (SDD) to find approximate critical values. King and Wu (1991) showed that the exact SDD of the DW statistic is equivalent to the distribution of the DW statistic from the regression with the lagged dependent variables replaced by their means. Unfortunately, these means are unknown although they could be estimated by the actual variable values. This provides a justification for using the exact critical values of the DW statistic from the regression with the lagged dependent variables treated as non-stochastic regressors. Extensive Monte Carlo experiments are reported in this paper. They show that this approach leads to reasonably accurate critical values, particularly when two lags of the dependent variable are present. Robustness to non-normality is also investigated.     

Towards a theory of point optimal testing

This paper puts the case for the inclusion of point optimal tests in the econometrician's repertoire. They do not suit every testing situation but the current evidence, which is reviewed here, indicates that they can have extremely useful Small-sample power properties. As well as being most powerful at a nominated point in the alternative hypothesis parameter space, they may also have optimum power at a number of other points and indeed be uniformly most powerful when such a test exists. Point optimal tests can also be used to trace out the maxemum attainable power envelope for a given testing problem, thus providing a benchmark against which test procedures can be evaluated. In some cases, point optimal tests can be constructed from tests of simple null hypothesis against a simple alternative. For a wide range of models of interst to econometricians, this paper shows how one can check whether a point optimal test can be constructed in this way. When it cannot, one may wish to consider approximately point optimal tests. As an illustration, the approach is applied to the non-nested problem of testing for AR(1) distrubances against MA(1) distrubances in the linear regression model.     

PHYSICAL PUNISHMENT IN THE HOME IN NEW ZEALAND

Results are reported for a national opinion poll of 1,000 adult New Zealanders which focussed on two questions: what are New Zealand parents currently doing to discipline their children, and what are the current attitudes of New Zealanders towards physical punishment in the home? Changes appear to be occurring in the attitudes and behaviour of New Zealanders toward physical punishment in the home. Although smacking with the hand is still both approved and used as a common parental response to the misbehaviour of children of all ages, anything more severe is no longer part of the repertoire of most parents or the experience of most children. Further evidence of change is provided by data on difference among the groups in the sample. Younger parents, current parents and the more highly educated are less likely to report using and endorsing the more severe forms of physical punishment that those who are older, have never had children or who have less education. Unlike the reported child-rearing practices of 30 years ago, parents today appear to be making use of a range of non-physical responses to misbehaviour and are more frequently explaining or discussing matters with their children.     

CRITICAL VALUE APPROXIMATIONS FOR TESTS OF LINEAR REGRESSION DISTURBANCES

Two important classes of tests for non-spherical disturbances in the linear regression model involve test statistics whose null distributions and hence critical values depend on the regressors. This paper investigates the accuracy of the normal, two moment beta and four moment beta approximations to the critical values of such tests. An empirical experiment aimed at evaluating the accuracy of the approximations for a variety of tests against autocorrelation and heteroscedasticity is conducted. Overall the approximations are found to provide reasonably accurate critical values with skewness being a factor determining the degree of accuracy.