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summ
2012 Jul 13
4
R-squared with Intercept set to 0 (zero) for linear regression in R is incorrect
...as the intercept, the R^2 value is the same in R and
Excel. In both cases the slope coefficient from R and from Excel are
identical.
k is a data frame with two columns.
M1 = lm(k[,1]~k[,2] + 0) ## set intercept to 0 and get different
R^2 values in R and Excel
M2 = lm(k[,1]~k[,2])
sumM1 = summary(M1)
sumM2 = summary(M2) ## get same value as Excel when intercept is not
set to 0
Below is what R returns for sumM1:
lm(formula = k[, 1] ~ k[, 2] + 0)
Residuals:
Min 1Q Median 3Q Max
-0.057199 -0.015857 0.003793 0.013737 0.056178
Coefficients:...
2008 Oct 23
0
error when using logistic.display within a loop
...t;= y <= 1". All the response variables have value of 0 or 1. It worked well for summary and anova but not for logistic.display in the loop.
Thanks for any help,
Tom
logreg1<-vector("list", length(l))
logreg.anov1<-vector("list",length(l))
logreg.summ1<-vector("list",length(l))
logreg.conf1<-vector("list",length(l))
for (i in c(13:16)){
logreg1[[i-x]]<-glm(dat[,i]~group + age, family=binomial, data=Ndat)
logreg.anov1[[i-x]]<-anova(logreg1[[i-x]])
logreg.summ1[[i-x]]<-summary(logreg1[[i-x]])
logreg.conf1[[i...