vinod gullu wrote: > Hi all, > I am trying to fit full quadratic model i.e liear + > square + interaction terms to my data (216 data > points), so in my case coefficients are 28 (6 > parameters). When i look into summary lm() of model > all cross terms coefficients are NA. What does this > mean? Is the regression is not able to solve for these > coefficients due to some reason. Or does this mean > that i should not consider these terms.
Are there any factors with more than 2 levels? We need some more details... Uwe Ligges > Regards, > > ______________________________________________ > R-help@stat.math.ethz.ch 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. ______________________________________________ R-help@stat.math.ethz.ch 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.
