search for: chi_sq

Hello, I have some measurements that I am trying to fit a model to. I also have uncertainties for these measurements. Some of the measurements are not well detected, so I'd like to use a limit instead of the actual measurement. (I am always dealing with upper limits, i.e. left censored data.) I have successfully run survreg using the combination of well detected measurements and limits,

Hi R fans, I was trying to write some code in R when I realized that I was just writing a FORTRAN 77 style program in the R syntax, and hence coming nowhere near tapping the potential of R. I'm wondering what is a good reference that would help me get up to speed in programming in R (i.e., using these classes, methods, objects, accessor functions, and many other things I don't