Table 6.
The parameters of ln Q0, Q0 and α for Hursh and Silberberg's (1988) exponential equation (Equation 5) fitted to the natural logarithms of the unmodified data for each food and for each hen and with k constrained to be 3.5 and 8.0. The standard error of the estimates of the fits (se), and the percentages of variance accounted for by the functions (%VAC) also appear. The value at which the equation predicts maximal response rate (Pmax) in units of the original price, C or the FR value, and in units of the normalized standard price [(C×Q0)/100] are also included.
| Hen | Food | ln Q0 | Q0 | α | se | %VAC | Pmax | |
| C | ||||||||
| k = 3.5 | ||||||||
| 61 | W | 4.20 | 66.9 | 8.24E-05 | 0.40 | 89.0 | 80 | 54 |
| HPW | 5.53 | 251.4 | 7.73E-05 | 0.07 | 99.7 | 23 | 57 | |
| PW | 5.65 | 283.8 | 7.23E-05 | 0.35 | 94.8 | 22 | 61 | |
| 62 | W | 4.46 | 86.7 | 8.01E-05 | 0.18 | 98.0 | 64 | 55 |
| HPW | 5.39 | 219.3 | 0.000146 | 0.11 | 99.1 | 14 | 30 | |
| PW | 5.16 | 174.4 | 6.27E-05 | 0.52 | 90.5 | 41 | 71 | |
| 63 | W | 3.85 | 47.2 | 0.000117 | 0.33 | 93.1 | 80 | 38 |
| HPW | 4.51 | 90.7 | 0.000197 | 0.36 | 91.6 | 25 | 22 | |
| PW | 5.70 | 300.1 | 5.93E-05 | 0.30 | 95.8 | 25 | 75 | |
| 64 | W | 4.32 | 75.5 | 5.94E-05 | 0.51 | 79.9 | 99 | 75 |
| HPW | 4.97 | 143.8 | 4.91E-05 | 0.13 | 96.3 | 63 | 90 | |
| PW | 5.73 | 307.3 | 0.000042 | 0.46 | 92.1 | 34 | 106 | |
| 65 | W | 5.00 | 148.7 | 7.47E-05 | 0.40 | 92.1 | 40 | 59 |
| HPW | 5.13 | 169.7 | 7.09E-05 | 0.18 | 96.2 | 37 | 63 | |
| PW | 5.71 | 300.4 | 5.76E-05 | 0.60 | 88.6 | 26 | 77 | |
| 66 | W | 4.01 | 54.9 | 0.000096 | 0.29 | 76.8 | 84 | 46 |
| HPW | 4.66 | 106.0 | 0.000183 | 0.38 | 91.7 | 23 | 24 | |
| PW | 5.27 | 194.7 | 9.59E-05 | 0.39 | 91.6 | 24 | 46 | |
| k = 8.0 | ||||||||
| 61 | W | 4.02 | 55.5 | 2.13E-05 | 0.46 | 85.2 | 126 | 70 |
| HPW | 5.32 | 203.9 | 2.17E-05 | 0.23 | 95.9 | 34 | 69 | |
| PW | 5.40 | 220.8 | 1.54E-05 | 0.50 | 89.0 | 44 | 97 | |
| 62 | W | 4.25 | 70.3 | 1.93E-05 | 0.34 | 92.9 | 110 | 78 |
| HPW | 4.92 | 137.0 | 3.41E-05 | 0.45 | 86.4 | 32 | 44 | |
| PW | 5.11 | 165.8 | 1.31E-05 | 0.50 | 91.3 | 69 | 114 | |
| 63 | W | 3.74 | 42.0 | 3.13E-05 | 0.34 | 92.7 | 114 | 48 |
| HPW | 4.41 | 82.1 | 5.79E-05 | 0.35 | 91.9 | 31 | 26 | |
| PW | 5.50 | 244.8 | 1.35E-05 | 0.42 | 91.8 | 45 | 111 | |
| 64 | W | 4.14 | 62.6 | 1.61E-05 | 0.56 | 75.3 | 148 | 93 |
| HPW | 4.90 | 134.7 | 1.71E-05 | 0.17 | 93.6 | 65 | 87 | |
| PW | 5.52 | 250.7 | 8.00E-06 | 0.64 | 85.0 | 75 | 187 | |
| 65 | W | 5.02 | 152.0 | 2.08E-05 | 0.17 | 98.6 | 47 | 72 |
| HPW | 5.01 | 150.2 | 2.25E-05 | 0.23 | 94.2 | 44 | 67 | |
| PW | 5.85 | 347.5 | 1.34E-05 | 0.32 | 96.8 | 32 | 112 | |
| 66 | W | 3.95 | 52.0 | 3.44E-05 | 0.32 | 73.2 | 84 | 44 |
| HPW | 4.62 | 101.3 | 5.30E-05 | 0.27 | 95.7 | 28 | 28 | |
| PW | 5.30 | 199.9 | 2.83E-05 | 0.12 | 99.2 | 26 | 53 | |