Table 2.
Properties of Progressive Ratio schedules
| Pellet number: | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PR 1.25 | ||||||||||||||
| Successive price | 1 | 2 | 2 | 2 | 2 | 4 | 4 | 5 | 6 | 8 | 10 | 12 | 15 | 19 |
| Cumulative price | 1 | 3 | 5 | 7 | 9 | 13 | 17 | 22 | 28 | 36 | 46 | 58 | 73 | 92 |
| Mean price | 1 | 1.5 | 1.7 | 1.8 | 1.8 | 2.1 | 2.4 | 2.7 | 3.2 | 3.6 | 4.2 | 4.8 | 5.6 | 6.6 |
| PR 1.5 | ||||||||||||||
| Successive price | 1 | 2 | 2 | 3 | 5 | 8 | 1 | 17 | 26 | 38 | 58 | 86 | 130 | 195 |
| Cumulative Price | 1 | 3 | 5 | 8 | 13 | 21 | 32 | 49 | 75 | 113 | 171 | 257 | 385 | 578 |
| Mean Price | 1 | 1.5 | 1.7 | 2.0 | 2.6 | 3.5 | 4.6 | 6.1 | 8.3 | 11.3 | 15.5 | 21.4 | 29.6 | 41.3 |
| PR 1.75 | ||||||||||||||
| Successive price | 1 | 2 | 3 | 5 | 9 | 16 | 29 | 50 | 88 | 154 | 269 | 471 | 825 | nc nc nc |
| Cumulative price | 1 | 3 | 6 | 11 | 20 | 36 | 65 | 115 | 203 | 357 | 626 | 1097 | 1923 | |
| Mean Price | 1 | 1.5 | 2.0 | 2.7 | 4.0 | 6.0 | 9.3 | 14.4 | 22.6 | 35.7 | 56.9 | 91.4 | 148 |
Note: Successive price refers to the number of responses required for consecutive pellets within a meal. Cumulative price are the total responses during the meal to that point. Mean price is cumulative price divided by pellet number. Nc= not calculated.