similar to: Use of 'by' function with FUN=mean

Hi, I want to get a clean succinct list of all levels for all my factor variables. I have a dataframe that's something like #1 below. This is just an example subset of my data and my actual dataset has 70 variables. I know how to narrow down my list of variables to just my factor variables by using #2 below (thanks to Bert Gunter). I can also get list of all levels for all my factor

Hi, I want to do a chi square test and I have two tab delimited text files with Expected and Observed values to compare. Each file contains only the values and are 48 rows by 116 columns. I have managed to do something with them, but I don't think it is right as I got a p value of 1. In this case I used the read.table() function to read the values from the files. But I don't know if

Hi John (and other authors of ChoiceModelR package), I am experiencing a weird thing when using the function choicemodelr under R3.0.1. Before I updated to R3.0, I had used choicemodelr unde R2.15. It was always as fast or faster than exactly the same task in Sawtooth software. Now, I've tried to run it under R3.0.1. It seems to be doing the job. But something is slowing it down dramatically.

I'm using caret to assess classifier performance (and it's great!). However, I've found that my results differ between R2.* and R3.* - reported accuracies are reduced dramatically. I suspect that a code change to kernlab ksvm may be responsible (see version 5.16-24 here: http://cran.r-project.org/web/packages/caret/news.html). I get very different results between caret_5.15-61 +

Hi every one How are you? after a days and searching in forums i still can not find some things that helping me to connect Rails with postgre SQL of course those are helpful but not for a stupid person like me :D So i need my friends helping me here and advice me to how can i connect this two things (ROR and Postgre Sql) I need your help so much My eyes going blind because of searching and

Hi I am running R2.15.2 64-bit on Windows 7, using RODBC 1.3-6, MySQL5.5.20, MySQL Connector 5.5.2 - these are the latest 64-bit versions AFAIK. sqlQuery and sqlSave work fin as expected, but in a long session with a few sqlSave() calls, I get an error, for example: Error in sqlSave(channel = channel, dat = USArrests[, 1, drop = FALSE], : HY000 1461 [MySQL][ODBC 5.2(w)

No soy del área informática por lo que me ha costado entender Rails (Se html, css y php (nivel básico) ) Estoy buscando a alguien de Santiago, Chile que esté interesado en capacitarme (pagado por su puesto) Gracias -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to

Hello, I am using function makePSOCKcluster to make parallel computation on 3 EC2 Amazon machines. I have a passwordless between machines and ssh is correct. In the R 2.15.1 release this function works correctly. Installing R 3.0.1 on my EC2 machines makePSOCKcluster does not produce the cluster. If I run the function with outfile="" option, I obtain this message Error in

I had a bunch of examples of byte code compiles in something I was writing. Changed to 3.0.2 and the advantage of compiler disappears. I've looked in the NEWS file but do not see anything that suggests that the compile is now built-in. Possibly I've just happened on a bunch of examples where it does not help, but experiences of a year ago do not seem to remain valid now. Just wondering if

Hi everybody. I'm trying to fit a weibull survival model with a spline basis for the predictor, using the survival library. I've noticed that it doesn't seem to be possible to use the aic method to choose the degrees of freedom for the spline basis in a parametric regression (although it's fine with the cox model, or if the degrees of freedom are specified directly by the user),

*Statistician * ?34,000 to ?39,000 (2 year contract position) WALTHAM Centre for Pet Nutrition, Leicestershire, UK The WALTHAM Centre for Pet Nutrition is the global hub of nutritional expertise for Mars Petcare, with a remit to deliver ?high-quality, innovative science conducted in a caring way?. You?ll join a talented team of statisticians, setting and supporting the roll-out of best practice

*Statistician * *?34,000 to ?39,000 (2 year contract position)* *WALTHAM Centre for Pet Nutrition, Leicestershire, UK* The WALTHAM Centre for Pet Nutrition is the global hub of nutritional expertise for Mars Petcare, with a remit to deliver ?high-quality, innovative science conducted in a caring way?. You?ll join a talented team of statisticians, setting and supporting the roll-out of best

Hi Strange to Rails.Read the tutorial on Scaffold.Can i generate a Simple form without using Scaffold? John -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to

Dear Sir, Many thanks for your reply. I have a query. I have a whole set of distributions which should be made normal / homoscedastic. Take for instance the warpbreaks data set. We have the following boxplots for the warpbreaks dataset: a. boxplot(breaks ~ wool) b. boxplot(breaks ~ tension) c. boxplot(breaks ~ interaction(wool,tension)) d. boxplot(breaks ~ wool @ each level of tension) e.

Dear Ashim, I?ll address your questions briefly but they?re really not appropriate for this list, which is for questions about using R, not general statistical questions. (1) The relevant distribution is within cells of the wool x tension cross-classification because it?s the deviations from the cell means that are supposed to be normally distributed with equal variance. In the warpbreaks data

Dear all, glht (from the multcomp package) needs a term and a model component in it's fitted model. In fitted models from e.g. repeated measurements ANOVAs I do not find neither model nor term. Is it possible to build together a model and term component myself, so that glht will work for repeated measurements ANOVAs? If so, how would I do that? Best regards, Michael Zehetleitner

I'm interested in restricting the pairwise comparisons of interaction effects in a multi-way factorial ANOVA, because I find comparisons of interactions between all different variables different to interpret. For example (supposing a p<0.10 cutoff just to be able to use this example): > summary(fm1 <- aov(breaks ~ wool*tension, data = warpbreaks)) Df Sum Sq Mean Sq F

I am still struggling to map a character string to an object name and vice versa in R. I thought the as.name() function might work, but observe the following behaviour ... > attach(warpbreaks) > levels(tension) [1] "L" "M" "H" > levels(as.name("tension")) NULL > objectname<-as.name("tension") > objectname tension >

Hi, I am seeking help with an error when running the example from R Documentation for TukeyHSD. The error occurs with any example I run, from any text book or website. thank you... > plot(TukeyHSD(fm1, "tension")). Error in plot(confint(as.glht(x)), ylim = c(0.5, n.contrasts + 0.5), ...) : error in evaluating the argument 'x' in selecting a method for function

Dear R-Helpers, I was calling the TukeyHSD function and not getting confidence intervals or p-values. It turns out this was caused by missing data and the fact that I had previously turned on R Commander (Rcmdr). John Fox knew that Rcmdr sets na.action to na.exclude, which causes the problem. If you have this problem, you can either exit Rcmdr before calling TukeyHSD or you can set na.action to