After ten rounds of playing the prisoners' dilemma game, subjects were given the possibility of eliminating one of the two actions by plurality. Each subject voted on whether to keep all actions, eliminate D, or eliminate C. After voting, the subject participated in ten more rounds depending on...

Greater data availability has been coupled with developments in statistical theory and economic theory to allow more elaborate and complicated models to be entertained. These include factor models, DSGE models, restricted vector autoregressions, and non-linear models.