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Hi I'm doing a regression analysis with dummy variables and I'm getting NA for some coefficients. I've inspected residuals, leverage effects and Cook's distance and it seems ok. Can someone explains what can cause this problem ? Thanks EJ

Hi, don' t understand why the function fomula have this error, i enclose the parameter "a" with the function I() Thank Ruben x<-1:5 y<-c( 2 ,4 , 6 , 8 ,11) formu<-y~I(a*x) form<-formula(formu) dummy<-data.frame(x=x,y=y) fm<-lm(form,data=dummy) Error in unique(c("AsIs", oldClass(x))) : Object "a" not found

...a SPARC system I tested on, operations on long doubles are vastly slower than on doubles, so that the patch produces a large slowdown rather than an improvement. This is also an issue for the "sum" function, which also uses an LDOUBLE to accumulate the sum. Perhaps an ordinarly double should be used in these places, or perhaps the configuration script should define LDOUBLE as double on architectures where long doubles are extraordinarily slow. Due to this issue, not defining MATPROD_CAN_BE_DONE_HERE at the start of array.c will disable this patch....

...a SPARC system I tested on, operations on long doubles are vastly slower than on doubles, so that the patch produces a large slowdown rather than an improvement. This is also an issue for the "sum" function, which also uses an LDOUBLE to accumulate the sum. Perhaps an ordinarly double should be used in these places, or perhaps the configuration script should define LDOUBLE as double on architectures where long doubles are extraordinarily slow. Due to this issue, not defining MATPROD_CAN_BE_DONE_HERE at the start of array.c will disable this patch....