From: Groupwise information sharing promotes ingroup favoritism in indirect reciprocity
Symbol | Meaning |
---|---|
M | Number of groups |
θ | Probability that a donor and recipient in a one-shot game are in the same group |
r∈{G, B}M | Reputation vector of a player in the eyes of M observers |
p k (r) | Probability that a player in group k has reputation vector r |
p−k(r) | Probability that a player outside group k has reputation vector r |
σ(r)∈{C, D} | Donor’s action to a recipient having reputation r∈{G, B} |
Φ r (a,r′) | Probability that an observer assigns reputation r∈{G, B} to a donor selecting action a∈{C, D} to a recipient having reputation r′∈{C, D} |
pin(r) | Probability that a player in the eyes of an ingroup observer has reputation r |
pout(r) | Probability that a player in the eyes of an outgroup observer has reputation r |