Guyer  R Documentation 
Anonymity and Cooperation
Description
The Guyer
data frame has 20 rows and 3 columns.
The data are from an experiment in which fourperson groups
played a prisoner's dilemma game for 30 trails, each person
making either a cooperative or competitive choice on each
trial. Choices were made either anonymously or in public;
groups were composed either of females or of males.
The observations are 20 groups.
Usage
Guyer
Format
This data frame contains the following columns:
 cooperation

Number of cooperative choices (out of 120 in all).
 condition

A factor with levels:
anonymous
, Anonymous choice;public
, Public choice.  sex

Sex. A factor with levels:
female
andmale
.
Source
Fox, J. and Guyer, M. (1978) Public choice and cooperation in nperson prisoner's dilemma. Journal of Conflict Resolution 22, 469–481.
References
Fox, J. (2016) Applied Regression Analysis and Generalized Linear Models, Third Edition. Sage.
Fox, J. and Weisberg, S. (2013) An R Companion to Applied Regression, Third Edition, Sage.