{"id":204,"date":"2017-04-18T02:43:25","date_gmt":"2017-04-18T02:43:25","guid":{"rendered":"http:\/\/sites.warnercnr.colostate.edu\/gwhite\/?page_id=204"},"modified":"2017-04-18T02:43:36","modified_gmt":"2017-04-18T02:43:36","slug":"aic-aicc-qaic-aicc","status":"publish","type":"page","link":"https:\/\/sites.warnercnr.colostate.edu\/gwhite\/aic-aicc-qaic-aicc\/","title":{"rendered":"AIC, AICc, QAIC, and AICc"},"content":{"rendered":"

Contents<\/a> – Index<\/a><\/span><\/p>\n

\n

AIC, AICc, QAIC, and AICc<\/b><\/span><\/p>\n

The number of parameters in the model is K<\/i>.\u00a0 The AIC depends on the number of parameters as<\/span><\/p>\n

AIC = -2log Likelihood + 2K<\/i><\/span><\/p>\n

and as does the QAIC (quasi-AIC)<\/span><\/p>\n

QAIC = -2log Likelihood\/<\/span>c-hat<\/a><\/span> + 2K<\/i><\/span><\/p>\n

the AICc:<\/span><\/p>\n

AICc = -2log Likelihood + 2K<\/i> + 2K<\/i>(K<\/i> + 1)\/(n-ess<\/i> – K<\/i> – 1)<\/span><\/p>\n

and the QAICc:<\/span><\/p>\n

QAICc = -2log Likelihood\/<\/span>c-hat<\/a><\/span> + 2K<\/i> + 2K<\/i>(K<\/i> + 1)\/(n-ess<\/i> – K<\/i> – 1)<\/span><\/p>\n

where n-ess<\/i> is the effective sample size.<\/span><\/p>\n

You can change the QAIC and QAICc value by changing <\/span>c-hat<\/a><\/span> with the Adjustments | c-hat menu options from the Results Browser<\/a>.<\/span><\/p>\n

An alternative model selection metric is BIC<\/a>.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Contents – Index AIC, AICc, QAIC, and AICc The number of parameters in the model is K.\u00a0 The AIC depends on the number of parameters as AIC = -2log Likelihood + 2K and as does the QAIC (quasi-AIC) QAIC = …<\/p>\n

AIC, AICc, QAIC, and AICc<\/span> Read More »<\/a><\/p>\n","protected":false},"author":117,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-204","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/sites.warnercnr.colostate.edu\/gwhite\/wp-json\/wp\/v2\/pages\/204","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sites.warnercnr.colostate.edu\/gwhite\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/sites.warnercnr.colostate.edu\/gwhite\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/sites.warnercnr.colostate.edu\/gwhite\/wp-json\/wp\/v2\/users\/117"}],"replies":[{"embeddable":true,"href":"https:\/\/sites.warnercnr.colostate.edu\/gwhite\/wp-json\/wp\/v2\/comments?post=204"}],"version-history":[{"count":2,"href":"https:\/\/sites.warnercnr.colostate.edu\/gwhite\/wp-json\/wp\/v2\/pages\/204\/revisions"}],"predecessor-version":[{"id":1315,"href":"https:\/\/sites.warnercnr.colostate.edu\/gwhite\/wp-json\/wp\/v2\/pages\/204\/revisions\/1315"}],"wp:attachment":[{"href":"https:\/\/sites.warnercnr.colostate.edu\/gwhite\/wp-json\/wp\/v2\/media?parent=204"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}