We develop a monthly output index of the U.S. Transportation sector over 1980Transportation sector over :1-2002 covering air, rail, water, truck, transit and pipeline activities. Separate indexes for freight and passenger are also constructed. Our total transportation output index matches very well with the annual transportation output figures produced by the Bureau of Labor Statistics (BLS) and the Bureau of Economic Analysis (BEA). The strong cyclical movements in the transportation output appear to be more synchronized with the growth slowdowns rather than full-fledged recessions of the U.S. economy. The index has led the turning points of the six NBER-defined growth cycles over the period with an average lead-time of 6 months at peaks and 5 months at troughs.3
This article reviews three previous factor analysis based studies of aggregate attitudes concerning the computer milieu and compares them with a recent one done by the authors; the four studies span almost twenty years. While providing a useful basis for making generalizations about current perceptions of the computer's role, thelatest study also sought to determine whether there was a group of persons who were fearful or anxious about the computer, whose concerns were masked in studies of aggregate attitudes. By using an instrument that was evaluated by an expert in phobic behaviour, it was possible to identify a population>hat was significantly different from the general population in attitude toward computers.The value of the current study, then, is two-fold. It makes possible a retrospective view of aggregate perceptions of the general population about computers and also otTers a glimpse of the attributes of those computer phobic or anxious persons who have not yet adapted to computer technology.
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