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) |
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