T. Stengos and E. Zacharias, "Intertemporal Pricing and Price Discrimination: A Semiparametric Hedonic Analysis of the Personal Computer Market", Journal of Applied Econometrics, Vol. 21, No. 3, 2006, pp. 371-386. The data are found in the file sz-data.txt, which is zipped in the file sz-data.zip. The data file is an ASCII file in DOS format. Below we provide the variable definitions. A detailed description of data sources can be found in the paper. The variables contained in sz-data.txt are: PRICE=Price in US dollars of 486 PCs SPEED=clock speed in MHz HARD DRIVE=size of hard drive in MB RAM=size of Ram in in MB SCREEN=size of screen in inches CD=dummy variable equals 1 if there is a CD-ROM present MULTI=dummy variable equals 1 if a multimedia kit is included (speakers, sound card) FIRM=dummy variable equals 1 if the manufacturer was a "premium" firm: IBM, COMPAQ ADS=number of 486 price listings for each month TREND=Time trend indicating month starting from January of 1993 to November of 1995. There are 6259 observations.