On Wed, 2007-12-05 at 18:06 -0800, Bin Yue wrote: > Dear friends : > using the "glm" function and setting family=binomial, I got a list of > coefficients. > The coefficients reflect the effects of predicted variables on the > probability of the response to be "1". > My response variable consists of "A" and "D" . I don't know which level of > the response was set to be 1. > is the first element of the response set to be 1? > Thank all in advance. > Regards, > > ----- > Best regards, > Bin Yue
As per the Details section of ?glm: For binomial and quasibinomial families the response can also be specified as a factor (when the first level denotes failure and all others success) ... So use: levels(response.variable) and that will give you the factor levels, where the first level is 0 and the second level is 1. If you work in a typical English based locale with default alpha based level ordering, it will likely be A (Alive?) is 0 and D (Dead?) is 1. HTH, 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.
