Demetrios Vakratsas and Frank M. Bass, "A Segment-Level Hazard Approach to Studying Household Purchase Timing Decisions", Journal of Applied Econometrics, Vol. 17, No. 1, 2002, pp. 49-59. The data are in the ASCII file "timing.data", which is in DOS format and is zipped in the file vb-data.zip. Unix users should use "unzip -a". The dataset consists of information, collected by A. C. Nielsen, related to times between purchases of ketchup for 268 households residing in Sioux Falls, SD and Springfield, MO. The length of the file is 2790 rows, with each row corresponding to a single purchase occasion (observation) for the household (see also data and variables section of paper for a more detailed description). There are a total of 9 variables described below: Column 1: household id Column 2: price per ounce Column 3: feature advertisement for purchased item Column 4: display of purchased item Column 5: time between consecutive purchases (interpurchase time) Column 6: employment status of female head of household Column 7: household income Column 8: household size Column 9: Number of purchase occasions (observations) per household Demetrios Vakratsas Faculty of Management McGill University 1001 Sherbrooke Street West Montreal, QC CANADA H3A 1G5 E-mail: vakratsa@management.mcgill.ca Phone: 514-398-2052 Fax: 514-398-3876