search for: nashi

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2008 Sep 02
1
Non-constant variance and non-Gaussian errors with gnls
I have been using the nls function to fit some simple non-linear regression models for properties of graphite bricks to historical datasets. I have then been using these fits to obtain mean predictions for the properties of the bricks a short time into the future. I have also been calculating approximate prediction intervals. The information I have suggests that the assumption of a normal
2009 Mar 13
6
R multiline expression grief
Dear all. After much grief I have finally found the source of some weird discrepancies in results generated using R. It turns out that this is due to the way R handles multi-line expressions. Here is an example with R version 2.8.1: ---------------------------------------------------- # R-script... r_parse_error <- function () { a <- 1; b <- 1; c <- 1; d <- a + b + c; e
2009 Mar 14
1
multiple hypothesis testing
...> > possible to get R to generate a warning that several lines of an > > expression are potentially being ignored, perhaps by turning on a > > strict mode which requires the semi-colons? > > > > Thank you, > > > > Paul > > > > > > -- > Nashi Power. > http://nashi.podzone.org/ > Registered address: 7 Trescoe Gardens, Harrow, Middx., U.K. > > > > ------------------------------ > > Message: 24 > Date: Fri, 13 Mar 2009 06:26:38 -0700 (PDT) > From: Ross Culloch <ross.culloch@dur.ac.uk> > Subject: Re: [...