. 1996 Nov 12;93(23):13421–13428. doi: 10.1073/pnas.93.23.13421

Table 10.

Joint relative frequency of cooperation (trust) and reciprocation (trustworthy): Repeat single 1

Relative frequency, reciprocation (1 − P_D)	Relative frequency, cooperation (1 − P_N)
Relative frequency, reciprocation (1 − P_D)	0–0.33	0.34–0.66	0.67–1.0	Total
0.67–1.0	6/47 = 0.128	5/47 = 0.106	14/47 = 0.298	25/47 = 0.532
0.34–0.66	1/47 = 0.021	6/47 = 0.128	4/47 = 0.085	11/47 = 0.234
0–0.33	10/47 = 0.212	0/47 = 0	1/47 = 0.021	11/47 = 0.234
Total	17/47 = 0.362	11/47 = 0.234	19/47 = 0.404	47/47 = 1

P_N, frequency of noncooperation (right move) at x₂; P_D, frequency of defection (down move) at x₃.