Re: [R] How to include an externally defined NULL value in lm

ith value either TRUE or FALSE). > > Formulae can also be constructed as text strings (e.g. using > ``paste'') and then converted > to actual formulae using as.formula(). > > HTH. > > cheers, > >Rolf Turner > > > > > On 4

Re: [R] How to include an externally defined NULL value in lm

HTH. cheers, Rolf Turner On 4/03/2008, at 11:34 AM, <[EMAIL PROTECTED]> wrote: >> From: Matthieu Stigler <[EMAIL PROTECTED]> >> Date: 2008/03/03 Mon PM 04:07:09 CST >> To: r-help@r-project.org >> Subject: [R] How to include an externa

Re: [R] How to include an externally defined NULL value in lm

>From: Matthieu Stigler <[EMAIL PROTECTED]> >Date: 2008/03/03 Mon PM 04:07:09 CST >To: r-help@r-project.org >Subject: [R] How to include an externally defined NULL value in lm maybe you should a<-0 unless there's special behavior of NULL that's unknownst to me ?

[R] How to include an externally defined NULL value in lm

Hello! I would love to be able to include an external variable to a lm call, I mean something: if(TRUE) a<-freeny.x[,4] else a<-NULL lm(freeny.y~freeny.x[,-4] +a) but it does not work with a<-NULL, whereas lm(freeny.y~freeny.x[,-4] +NULL) I don't understand why and did not find an a