Table 1.

Descriptive Statistics, Alphas, and Zero-order Correlations.

Variable	Mean	SD	1	2	3	4	5	6	7	8	9
1. SVO	−689.83	997.48	—
2. SDO	2.29	1.27	−.28	.92
3. RWA	−1.11	1.29	−.14	.39	.93
4. Political ideology	3.23	1.61	−.13	.41	.55	.87
5. Rep. versus Dem.	—	—	.08	.39	−.42	−.63	—
6. Exp. cooperation	170.97	87.32	.10	.03	.08	.07	−.11	.73
7. Own cooperation	192.90	108.55	.30	−.08	−.03	.02	−.03	.71	.86
8. Diff. expect	−41.12	72.78	−.09	.29	.33	.43	−.56	.06	−.03	—
9. Diff. cooperation	−26.40	66.36	−.05	.25	.28	.38	−.50	.06	.08	.70	—

Note: N = 728 (N = 580 for correlations with Rep. vs. Dem.). The values at the diagonal line (if any) are the interitem correlations (αs) of the target scale. Correlations over r = .08 are significant at p < .05. SVO = social value orientation; SDO = social dominance orientation; RWA = right-wing authoritarianism; Rep. versus Dem. = Republicans (coded 1) versus Democrats (coded 2); Exp. cooperation = the total amount of expected cooperation from partner summed across all four trials of the prisoner’s dilemma; Own cooperation = the total amount of own cooperation summed across the four trials of the prisoner’s dilemma; Diff. expect = difference in the expected cooperation from Republican partner versus Democrat partner (a positive value indicates greater expected cooperation from a Republican, than Democrat, partner); Diff. cooperation = difference in one’s cooperation toward a Republican partner versus a Democrat partner (a positive value indicates greater cooperation with a Republican partner than Democrat partner).