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Hello, I have a problem when doing gam (from gam library; I am using R 2.4.0, windows xp platform) When doing: example(gam) There is this error message (which also happens when using my data) .... Warning: a final empty element has been omitted the part of the args list of 'list' being evaluated was: (coefficients = fit$beta, residuals = fit$y - fit$eta, fitted.values = fit$eta,

Hi, Could you please explain what is non-positive fis error? I have been trying to use quantile regression (rq) procedure and I keep ending up with this error. I haven't been able to find an explanation for the same. Best Regards, Arti Arti Mann Ph.D. Student Department of Information Systems W.P. Carey School of Business Arizona State University Email : Arti.Mann at asu.edu

I'm very new to R and I live in Mali, west Africa. I'm on *OS X 10.7.5*. I downloaded and installed *R 3.2.1*. I downloaded and installed *RStudio 00.99.893*. I ran through the free Microsoft data camp intro to R course, then started another free course through 'edX', for Data and Statistics for Life Sciences, using R. The first prompt in the course is to