Re: [R] [EXT] Theta from negative binomial regression and power_NegativeBinomiial from PASSED

Hi John, the negative binomial is a tricky one - there are several different parameterisations and therefore different interpretations of the parameters. Joseph Hilbe wrote a whole book on it that might be wroth checking. Cheers, Andrew -- Andrew Robinson Chief Executive Officer, CEBRA and

Re: [R] [EXT] Downloading a directory of text files into R

Hi Bob, there may be more efficient ways to go about it but I would use R to scrape the contents of http://home.brisnet.org.au/~bgreen/Data/Hanson1/ http://home.brisnet.org.au/~bgreen/Data/Hanson2/ in order to form the URLs of the files, and then loop over the URLs. Cheers, Andrew -- Andrew

Re: [R] [EXT] How to calculate the derivatives at each data point?

Try something like with(df, predict(smooth.spline(x = altitude, y = atm_values), deriv = 1)) Cheers, Andrew -- Andrew Robinson Chief Executive Officer, CEBRA and Professor of Biosecurity, School/s of BioSciences and Mathematics & Statistics University of Melbourne, VIC 3010 Australia Tel: