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Julia, vc pode usar, por exemplo:<br>
<font face="arial, helvetica, sans-serif">m1<-lm(Y~-1+cbind(x1,x2,x3,I(x1^2)
,I(x2^2),I(x3^2)</font>))<br>
Luzia<br>
<br>
Em 18/04/2012 17:47, Julia Maria escreveu:
<blockquote
cite="mid:1334782060.87189.YahooMailNeo@web120804.mail.ne1.yahoo.com"
type="cite"><font face="arial, helvetica, sans-serif">m1<-lm(Y~-1+x1+x2+x3+I(x1^2) +I(x2^2)+I(x3^2)</font></blockquote>
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