The data file pullover.dat contains data on ``classic blue'' pullovers sales in 10 periods, see Härdle and Simar (1999).
Column | Type | Description |
1 | metric | sales (in pullovers) |
2 | metric | price (in DM) |
3 | metric | advertisement costs in local newspapers (in DM) |
4 | metric | presence of shop assistant (in hours per period) |