网站大量收购闲置独家精品文档,联系QQ:2885784924

演化博弈理论(进化博弈论).ppt

  1. 1、本文档共49页,可阅读全部内容。
  2. 2、有哪些信誉好的足球投注网站(book118)网站文档一经付费(服务费),不意味着购买了该文档的版权,仅供个人/单位学习、研究之用,不得用于商业用途,未经授权,严禁复制、发行、汇编、翻译或者网络传播等,侵权必究。
  3. 3、本站所有内容均由合作方或网友上传,本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺!文档内容仅供研究参考,付费前请自行鉴别。如您付费,意味着您自己接受本站规则且自行承担风险,本站不退款、不进行额外附加服务;查看《如何避免下载的几个坑》。如果您已付费下载过本站文档,您可以点击 这里二次下载
  4. 4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等,请点击“版权申诉”(推荐),也可以打举报电话:400-050-0827(电话支持时间:9:00-18:30)。
查看更多

EvolutionaryGameTheoryAmitBahlCIS620

OutlineEGTversusCGTEvolutionaryStableStrategies ConceptsandExamplesReplicatorDynamics ConceptsandExamplesOverviewof2papers Selectionmethods,finitepopulations

EGTv.ConventionalGameTheoryModelsusedtostudyinteractivedecisionmaking.Equilibriumisstillatheartofthemodel.Keydifferenceisinthenotionofrationalityofagents.

AgentRationalityInGT,oneassumesthatagentsareperfectlyrational.InEGT,trialanderrorprocessgivesstrategiesthatcanbeselectedforbysomeforce(evolution-biological,cultural,etc…).ThislackofrationalityisthepointofdeparturebetweenEGTandGT.

EvolutionWheninbiologicalsense,naturalselectionismodeofevolution.StrategiesthatincreaseDarwinianfitnessarepreferable.Frequencydependentselection.

EvolutionaryGameTheory(EGT)HasoriginsinworkofR.A.Fisher[TheGeneticTheoryofNaturalSelection(1930)].Fisherstudiedwhysexratioisapproximatelyequalinmanyspecies.MaynardSmithandPriceintroduceconceptofanESS[TheLogicofAnimalConflict(1973)].Taylor,Zeeman,Jonker(1978-1979)providecontinuousdynamicsforEGT(replicatordynamics).

ESSApproachESS=NashEquilibrium+StabilityConditionNotionofstabilityappliesonlytoisolatedburstsofmutations.SelectionwilltendtoleadtoanESS,onceatanESSselectionkeepsusthere.

ESS-DefinitionConsidera2playersymmetricgamewithESSgivenbyIwithpayoffmatrixE.LetpbeasmallpercentageofpopulationplayingmutantstrategyJ?I.Fitnessgivenby W(I)=W0+(1-p)E(I,I)+pE(I,J) W(J)=W0+(1-p)E(J,I)+pE(J,J)RequirethatW(I)W(J)

ESS-DefinitionStandardDefinitionforESS(MaynardSmith).IisanESSifforallJ?I, E(I,I)?E(J,I)and E(I,I)=E(J,I)?E(I,J)E(J,J)whereEisthepayofffunction.

ESS-DefinitionAssumptions: 1)Pairwise,symmetric

文档评论(0)

胜家 + 关注
实名认证
内容提供者

文档好 才是真的好

1亿VIP精品文档

相关文档