No abstract

No abstract

The constituent parts of a five component behavioural intervention package are described and the effect of the intervention on the on-task behaviour of two "disruptive" secondary school classes reported. It is claimed that levels of pupil on-task behaviour were significantly increased in both classes. Concomitant changes in teacher behaviour were also reported and it is suggested that increased levels of pupil on-task behaviour may have elicited higher levels of positive verbal behaviour from the teachers.

No abstract

summary 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.