. 2015 Jun 2;6:729. doi: 10.3389/fpsyg.2015.00729

Table 4.

Aggression and cooperative behavior.

Dependent variable: contributions to projects A and B OLS estimates
	(1)	(2)	(3)
Aggressor	1.677	1.677	−3.158
	(1.780)	(1.509)	(2.375)
Aggressor × Period			1.382
			(0.539)^**
Period			−1.885
			(0.420)^***
Constant	13.295	13.476	17.884
	(1.378)^***	(2.806)^***	(3.167)^***
Observations	576	576	576
R²	0.006	0.110	0.116
Session dummies	No	Yes	Yes
Period dummies	No	Yes	No

Standard errors clustered by group in parentheses.

^***

p < 0.01,

^**

p < 0.05,

*p < 0.1. Aggressor = 1 if participant in Aggression condition, = 0 if Control condition.