egttools.games.OneShotCRD¶

class OneShotCRD(self: egttools.numerical.numerical.games.OneShotCRD, endowment: float, cost: float, risk: float, group_size: int, min_nb_cooperators: int)¶

Bases: AbstractGame

One-Shot Collective Risk Dilemma (CRD).

The full description of the One-shot CRD can be found in: Santos and Pacheco, ‘Risk of Collective Failure Provides an Escape from the Tragedy of the Commons’.

Parameters

endowment (float) – Initial endowment for all players. This is parameter b in the mentioned article.
cost (float) – Cost of cooperation.
risk (float) – The probability that all members will lose their remaining endowment if the threshold is not achieved.
group_size (int) – Size of the group that will play the CRD.
min_nb_cooperators (int) – Minimum number of cooperators required to avoid the risk of collective loss.

Methods

`calculate_fitness`	calculates the fitness of an individual of a given strategy given a population state.It always assumes that the population state does not contain the current individual
`calculate_group_achievement`	calculates the group achievement for a given stationary distribution.
`calculate_payoffs`	updates the internal payoff and coop_level matrices by calculating the payoff of each strategy given any possible strategy pair
`calculate_population_group_achievement`	calculates the group achievement in the population at a given state.
`nb_strategies`	Number of different strategies which are playing the game.
`payoff`	returns the payoff of a strategy given a group composition.
`payoffs`	returns the expected payoffs of each strategy vs each possible game state
`play`
`save_payoffs`	Saves the payoff matrix in a txt file.
`type`

Attributes

`cost`	Cost of cooperation.
`endowment`	Initial endowment for all players.
`group_achievement_per_group`
`group_size`	Size of the group which will play the game.
`min_nb_cooperators`	Minimum number of cooperators to reach the target.
`nb_states`	Number of combinations of Cs and Ds that can be matched in the game.
`risk`	Probability that all players will lose their remaining endowment if the target si not achieved.

__init__(self: egttools.numerical.numerical.games.OneShotCRD, endowment: float, cost: float, risk: float, group_size: int, min_nb_cooperators: int) → None¶

One-Shot Collective Risk Dilemma (CRD).

The full description of the One-shot CRD can be found in: Santos and Pacheco, ‘Risk of Collective Failure Provides an Escape from the Tragedy of the Commons’.

Parameters

endowment (float) – Initial endowment for all players. This is parameter b in the mentioned article.
cost (float) – Cost of cooperation.
risk (float) – The probability that all members will lose their remaining endowment if the threshold is not achieved.
group_size (int) – Size of the group that will play the CRD.
min_nb_cooperators (int) – Minimum number of cooperators required to avoid the risk of collective loss.