On 19-Jan-2012 Xiaobo Gu wrote: > Hi, > I see the following is the credit scoreing in R guide : > > m2<-glm(formula = good_bad ~ checking + duration + history + > purpose +amount + savings + employed + installp + marital + > coapp +age + other + depends + telephon + foreign +checking:amount > > What does checking:amount mean? > > Regards, > Xiaobo Gu
See the explanation of model formulae under "Details" in ?glm : A specification of the form ?first:second? indicates the set of terms obtained by taking the interactions of all terms in 'first' with all terms in 'second'. The specification 'first*second' indicates the _cross_ of 'first' and 'second'. This is the same as 'first + second + first:second'. Ted. ------------------------------------------------- E-Mail: (Ted Harding) <ted.hard...@wlandres.net> Date: 19-Jan-2012 Time: 13:37:23 This message was sent by XFMail ______________________________________________ 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.
