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Table 2 Each subject's delay (k d ) and probability (k p ) discount rates and decay rate k sp of subjective probability of obtaining delayed rewards (SP).

From: A hyperbolic decay of subjective probability of obtaining delayed rewards

Subject's ID k d k p k sp Subject's ID k d k p k sp
1 0.000620 1.3047 n.a. 16 0.001757 0.9972 0.012409
2 0.000320 1.5601 0.025945 17 0.000455 1.0612 0.027894
3 0.002862 1.3140 0.007099 18 0.000928 1.0243 0.000631
4 0.000385 1.1339 n.a. 19 n.a. 0.4244 0.000116
5 0.004214 1.1543 0.025158 20 0.000144 1.4166 n.a.
6 0.000388 0.3495 0.022878 21 0.000053 0.6046 0.000333
7 0.000645 1.6229 0.002207 22 0.000378 0.5443 0.013914
8 0.004837 2.8802 0.002156 23 0.000224 24.9100 0.225340
9 0.001377 0.5892 0.000737 24 0.000115 0.8915 0.000031
10 0.021098 1.4429 0.000059 25 0.000170 1.3478 0.000002
11 0.008886 1.1245 0.017660 26 0.001646 3.4975 0.000026
12 0.035444 1.5373 0.028255 27 0.054930 0.9969 0.027064
13 0.000131 2.1120 0.000030 28 0.000052 0.7414 0.000347
14 0.000035 0.6274 0.000038 29 0.004808 0.0337 0.312700
15 0.000000062 0.5930 0.000640 30 0.001757 1.0714 0.015360
     Median 0.000489 1.0170 0.001395
  1. Note that all k parameters were estimated with hyperbolic functions (not with exponential functions). n.a. indicates failure in estimating parameters in nonlinear regression [20].