On a lemma associated with Box,Jenkins and Granger

The lemma that the aggregate of independent moving average processes is also moving average is discussed, and a simple proof presented. This proof depends on the fact that, for any order q, the vectors of MA autocorrelations (?₁…?_q) occupy a convex space.     

Employment impact of public construction

This note analyzes the employment impacts of three different types of public construction projects. These impacts involve the labor content of a construction dollar, the time pattern of employment, and the labor force composition.     

Ectopic supernumerary kidney: Another cause of a pelvic mass

Ectopic supernumerary pelvic kidney is a rare cause of a pelvic mass in the adolescent populations. We present a case of an ectopic supernumerary pelvic kidney, found incidentally, on a computed axial tomographic (CT) examination.     

Macroeconomic factors of growth of Russian cities and town planning policy objectives

This paper was prepared for the 70th birthday of Oleg Sergeevich Pchelintsev, but he did not live to see it in print. For memorials of O.S. Pchelintsev, see www.demoscope.ru Nos 243–244 of April 17–30, 2006. The paper analyzes the channels and ways by which macroeconomic policy impacts the development of urban settlement and individual groups of cities. Its findings are used to validate new directions and measures of urban policy