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Are you asking us to do your homework? This is not a homework list. For the t-test look in any introductory R manual. For the histograms, look in the lattice library. HTH Daniel -- View this message in context: http...

You can just tell the function to create 1000 random numbers. See ?runif for the specifics. The arguments are n, min, and max. 'n' is the one you are looking for. Da. -- View this message in context: http://r.789695...

Hi, I have seen a discussion in the R-help asking whether nonparametric manova has been implemented in R yet. This discussion is form March 2006 and there seemed to be no package or function implemented at the time. Has...

You can specify the weights=... argument in the lm() function as vector of weights, one for each observation. Should that not do what your are trying to do? HTH, Daniel -- View this message in context: http://r.789695.n4.nabble...

Does anything speak against selecting only x where x$B<20 and then splitting it by x$C? split(x[!x$B<20,],x$C) HTH, Daniel -- View this message in context: http://r.789695.n4.nabble.com/Split-data...

?plot ?points You will probably need to get some R basics down as to how to index certain subsets of your data. This you find in any introductory R manual. HTH, Daniel -- View this message in context: http://r.789695...

If you want perfect equality, split the data in good and bad and sample from the two samples individually. On average, however, random sampling from the entire data will reproduce the proportion of good and bad in the data. hth...

Hi, pick up any introductory manual of which there are many online. It so happens that the functions for mean and sd are called mean() and sd(). If you want to know how to use them type ?mean or ?sd...

Not satisfactory in which sense? The survreg(Surv(Value,Censoring)~indvars+strata(id)) should/may work. For a discussion of Tobit fixed effects, see also Greene's website: http://pages.stern.nyu.edu/~wgreene/publications.htm under "Fixed Efects and...

Hi, I am trying to extract some numbers from a text string. The problem is that the delimiting symbols are identical so that I do not know how to tell "sub" between which of them to extract. The string looks...

You can define a function that does just that: sum the 1s in Acc and divide by the length of Acc. Then use tapply to apply the function for each subject. f=function(x){sum(as.numeric(as.character(x...

Hi, assuming your production figures are in a square matrix, where points with no production take zero and points with production take the production figure, you could use image() This is the most basic approach I would think. Daniel -- View...

Atte, note the similarity between what Greg described and a bootstrap. The difference to a true bootstrap is that in Greg's version you subsample the population (or in other instances the data). This is known as subsampling bootstrap and...

these websites seem to have the data. though I have not checked for completeness. the rsssf in particular is seems to be concerned with collecting and archiving these kinds of football data: http://www.rsssf.com/tablesw/worldcup.html http...

They seem to have a workaround. I don't know whether anything better is available by now. http://www.mathworks.com/matlabcentral/newsreader/view_thread/163726 HTH, Daniel sarak wrote: > > Is it possible for anyone to upload a youtube video...

There is the plm package for linear panel models. Further, since estimation of fixed effects models rests on the within-subject or -object variance, the R-squared of interest is typically the within R-squared, not the overall or between...

Hi, you should be able to do most of your summaries using tapply() or aggregate(). for your example, tapply(d$Acc,list(d$Sample),table) Here tapply takes Acc, "splits" it by Sample, and then tables Acc (which returns how...

Hi, Why does the second example on ?parcoord help page not help you with that? ?parcoord ir <- rbind(iris3[,,1], iris3[,,2], iris3[,,3]) parcoord(log(ir)[, c(3, 4, 2, 1)], col = 1 + (0:149)%/%50) If that does...

Why would that be preferable to dropping the variables after importing the whole dataset? Daniel sassorauk wrote: > > Is it possible to import only certain variables from a SPSS file. > > I know that read.spss in the foreign library will bring...

Say you have the string x in a matrix x<-c('a,..gGGtTaac<!T','caaGGTT,,.!!@CC') x<-matrix(x) remove all punctuation: x1<-gsub('[[:punct:]]','',x) x1 convert all letter to lowercase x2<-gsub('(\\w*)','\\L\\1',x1,perl=T...