Hi Eiko, How about this?
> anova (m1, m2, test="Chisq") See: ?anova.glm Regards, José Prof. José Iparraguirre Chief Economist Age UK -----Original Message----- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of Torvon Sent: 11 September 2013 16:48 To: r-help@r-project.org Subject: [R] Chi-square values in GLM model comparison Hello -- I am comparing two GLMs (binomial dependent variable) , the results are the following: > m1<-glm(symptoms ~ phq_index, data=data2) m2<-glm(symptoms ~ 1, > data=data2) Trying to compare these models using > anova (m1, m2) I do not obtain chi-square values or a chi-square difference test; instead, I get loglikelihood ratios: > Likelihood ratio tests of cumulative link models: > formula: link: threshold: > m2 sym_bin ~ 1 logit flexible > m1 sym_bin ~ phq_index logit flexible > no.par AIC logLik LR.stat df Pr(>Chisq) > m2 1 10947 -5472.5 > m1 9 9711 -4846.5 1252 8 < 2.2e-16 *** Since reviewers would like me to report chi-square values: how to I obtain them when comparing GLMs? I'm looking for an output similar to the output of the GLMER function in LME4, e.g.: > anova(m3,m4) ... > Df AIC BIC logLik Chisq Chi Df Pr(>Chisq) > m3 13 11288 11393 -5630.9 > m4 21 11212 11382 -5584.9 92.02 8 < 2.2e-16 *** Thank you! Eiko [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. The Wireless from Age UK | Radio for grown-ups. www.ageuk.org.uk/thewireless If you’re looking for a radio station that offers real variety, tune in to The Wireless from Age UK. Whether you choose to listen through the website at www.ageuk.org.uk/thewireless, on digital radio (currently available in London and Yorkshire) or through our TuneIn Radio app, you can look forward to an inspiring mix of music, conversation and useful information 24 hours a day. ------------------------------- Age UK is a registered charity and company limited by guarantee, (registered charity number 1128267, registered company number 6825798). Registered office: Tavis House, 1-6 Tavistock Square, London WC1H 9NA. For the purposes of promoting Age UK Insurance, Age UK is an Appointed Representative of Age UK Enterprises Limited, Age UK is an Introducer Appointed Representative of JLT Benefit Solutions Limited and Simplyhealth Access for the purposes of introducing potential annuity and health cash plans customers respectively. Age UK Enterprises Limited, JLT Benefit Solutions Limited and Simplyhealth Access are all authorised and regulated by the Financial Services Authority. ------------------------------ This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you receive a message in error, please advise the sender and delete immediately. Except where this email is sent in the usual course of our business, any opinions expressed in this email are those of the author and do not necessarily reflect the opinions of Age UK or its subsidiaries and associated companies. Age UK monitors all e-mail transmissions passing through its network and may block or modify mails which are deemed to be unsuitable. Age Concern England (charity number 261794) and Help the Aged (charity number 272786) and their trading and other associated companies merged on 1st April 2009. Together they have formed the Age UK Group, dedicated to improving the lives of people in later life. The three national Age Concerns in Scotland, Northern Ireland and Wales have also merged with Help the Aged in these nations to form three registered charities: Age Scotland, Age NI, Age Cymru. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
