Table 1 Determinants of cooperation.

Model	(1)	(2)	(3)	(4)	(5)	(6)	(7)
what data		1.017***		−0.132	1.282***	1.395***	0.265
whom data			0.219	0.073	−0.287***	−0.167	−0.133
recent decision	1.671***	0.695***	1.198***	0.697***	0.475***	1.206***	0.953***
round	−0.029**	−0.013*	−0.019	−0.015	−0.028**	−0.043**	0.021
current total earnings	2.834***	1.607***	0.872	1.665**	3.743***	1.959*	1.020
decision received	0.883***	0.391**	0.211	0.966***	0.510*	0.705*	0.439
intercept	−2.174**	−1.139***	−0.725	−0.696+	−1.084**	−1.182*	−1.200*
N	878	1,553	185	535	625	296	254

Each column presents estimates of the fit of a logistic generalized linear mixed model to decisions to cooperate (see Supplementary Information). In all models, we controlled the round number, subjects’ current total earnings divided by 10,000, the decisions by subjects in the previous two rounds (the number of ‘C’ between 0 and 2), and previously received help as a recipient in the previous round (‘C’ and ‘D’ are coded as 1 and 0, respectively). Model (2) and Models (4) to (7) consider the average number of items of what data disclosed while Models (3) to (7) consider those of whom data disclosed. Data from the first ten rounds and beyond the 51st round were excluded from the analysis. Data for Model (1) include only those decisions with no disclosure. Models (2) and (3) include those decisions in which only what data and only whom data, respectively, were disclosed. Models (4) and (5) include those decisions in which all pairs are what-prior data and the what data are ‘C’ only and ‘D’ only, respectively. Models (6) and (7) include those decisions in which all pairs are whom-prior data and the whom data are ‘G’ only and ‘B’ only, respectively. The remaining data (N = 1,906) were excluded from the analysis. P-values: *** < 0.1% < ** < 1% < * < 5% < + < 10%, where the P-value is defined as the minimum level of significance that is needed to reject the null hypothesis in relation to each variable.

Search