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R programming and usage, R news, R tips and tutorialsenSat, 23 May 2015 05:17:41 GMTvBulletin60http://www.talkstats.com/images/misc/rss.pngStatistics Help @ Talk Stats Forum - R
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Double hierarchical models on MCMCglmm
http://www.talkstats.com/showthread.php/60944-Double-hierarchical-models-on-MCMCglmm?goto=newpost
Fri, 22 May 2015 16:12:38 GMTI am new using R and I need a model to fit both the mean and the SD of the model (similar to the Double hierarchical generalized linear models). Is...I am new using R and I need a model to fit both the mean and the SD of the model (similar to the Double hierarchical generalized linear models). Is it possible to perform using the MCMCglmm package? I already have a model for the mean, but I couldn't manage to module the SD.
]]>RVelhttp://www.talkstats.com/showthread.php/60944-Double-hierarchical-models-on-MCMCglmmR Programming
http://www.talkstats.com/showthread.php/60934-R-Programming?goto=newpost
Fri, 22 May 2015 01:20:40 GMTHello there,
I wanted to learn R programming over this summer hence I registered for the R programming course on Coursera. I understood most part...Hello there,

I wanted to learn R programming over this summer hence I registered for the R programming course on Coursera. I understood most part of the lecture but I'm having a hard time with the assignments.

Till now I can write small functions such as calculating mean of a vector or an array. I can also use arguments such as lapply, sapply, rbind etc.

I am not very handy with coding in R. I get completely stuck.

What should I do to learn gradually?

Can anyone tell me what to do step by step. I'm an average student pursuing my masters in Engineering Management at UNC Charlotte.
]]>Rvarun1220http://www.talkstats.com/showthread.php/60934-R-ProgrammingPolynomial Linear Contrast in R
http://www.talkstats.com/showthread.php/60933-Polynomial-Linear-Contrast-in-R?goto=newpost
Thu, 21 May 2015 23:09:22 GMTHello,
I would like to perform a polynomial linear contrast to test for the linear relationship of a variable made of counts with a factor made of...Hello,

I would like to perform a polynomial linear contrast to test for the linear relationship of a variable made of counts with a factor made of 5 levels (0.2; 0.5; 1; 2; 5). I know how to do that in SPSS, but not in R. So far, I have performed a GLM with a negative binomial distribution (that's what fits my response variable best). Any suggestion about how to code a polynomial linear contrast in R?