[R] NA in dummy regression coefficients

Ernesto Jardim ernesto at ipimar.pt
Thu Feb 27 17:41:03 CET 2003


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 ?



More information about the R-help mailing list