U. S. data on employment have lacked crucial information on the demand for labor. The only available data have been those collected by the National Bureau of Economic Research on help-wanted advertising, and those from the Bureau of Employment Security on job applicants. Recently, however, the...

Studies of collective bargaining in the mass-production industries have given much attention to pattern-setting negotiations, which usually take place at the major levels of management and union government. Far less is known about collective bargaining at the secondary level, despite the large...

In this paper we analyse the repeated time series model where the fundamental component follows a ARMA process. In the model, the error variance as well as the number of repetition are allowed to change over time. It is shown that the model is identified. The maximum likelihood estimator is...