On May 27, 2014, at 3:51 AM, Xebar Saram <zelt...@gmail.com> wrote: > Hi all > > i know this is probably a silly question but im wondering what is the > 'reference' category when you run a binomal glm. that is my outcome/DV is > 0,1 and i run a regression and get coefficients. do the coefficients refer > to the probability to get 0 or 1? > > thanks so much in advance > > Z
As per the Details section of ?glm: A typical predictor has the form response ~ terms where response is the (numeric) response vector and terms is a series of terms which specifies a linear predictor for response. For binomial and quasibinomial families the response can also be specified as a factor (when the first level denotes failure and all others success) or as a two-column matrix with the columns giving the numbers of successes and failures. Thus, if you have a numeric 0/1 response, you are predicting 1's and if you use a two level factor, you are predicting the second level of the factor. Regards, Marc Schwartz ______________________________________________ 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.
