The Wald test for linear restrictions on cointegrating vectors is compared in nite samples using the Monte Carlo method. The Wald test within the vector error-correction based methods of Bewley et al. fully modiied ordinary least squares method of Phillips and Hansen (1990), and the band spectral techniques of Phillips (1991) are considered. In terms of test size, Jo-hansen's method seems to be...

SIR,-Dr Phillips questions (April 17, p 1008) the value of twin studies in estimating the genetic component in the most common diseases of adult life. He points out that the intrauterine environment of twins, monozygous as well as dizygous, may be different and that this distinction may account for later differences in disease prevalence between co-twins. Thus, a greater concordance between mon...

I n most industrialized economies, periods of above average inflation tend to be associated with above average economic activity, for example, as measured by a relatively low unemployment rate. This statistical relationship, known as the Phillips curve, is sometimes invoked when economic commentators suggest that monetary policy should not try to suppress signs of inflation. But this interpreta...

In 1958, A.W. Phillips discovered a strong negative correlation between inflation and unemployment in United Kingdom data. Continuing controversy surrounds the long-run trade-off suggested by a curve he drew through these observations. We conduct a wide-ranging investigation of the post-war U.S. Phillips correlations and Phillips curve. Many economists view the Phillips correlations as chimeric...