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Hi, Thanks in advance for the help. I have a few vectors and I need to get all the combinations of the vector values. Normally I would use a few for-loops to do that. e.g x1_c(1,3,5) x2_c(2,5,6) for (i in x1) { for (j in x2) { ... }} My problem is that I don't know how many vectors there are ahead of time, so I don't know how many for-loops I need. Any

Hello all, I have a very simple set of data and I would like to analyze them with probit analysis. The data are: X Event Trial 100 8 8 75 8 8 50 6 8 25 4 8 10 2 8 0 0 8 I want to estimate the value of X that will give a 95% hit rate (Event/Trial) and the corresponding 95% CI. Anyone can offer some help? Thanks!! -

How does R compute the p-value in the Wilcoxon Rank Sum Test? If I have the test statistics, can I get the p-value using the function pwilcox? Thanks -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the

Hello everyone, Does anyone know if I can do Breslow Day Test for the homogeneity of odds ratio in R? Thanks! - Jacqueline

Dear list, I have a simple question. If I need to run linear regression on a subset of the dataset, will the following two commands give the same output: lm(y ~ as.factor(x1) + as.factor(x2), data, subset = z==Z[1]) and lm(y ~ as.factor(x1) + as.factor(x2), data[data$z==Z[1],] ) I have got different results running the two commands. Am I missing something here, or it there a bug on the

Hi all, Suppose I have a vector Fruits <- c('Apple','Orange','Pear','Banana','Mango') I want to print the statement "The fruits in the basket are: Apple, Orange, Pear, Banana, Mango" If I do: print(paste('The fruits in the basket are:',Fruits)) The output is: [1] "The fruits in the basket are: Apple" "The fruits in

Hi all, I am trying to run the k-means cluster analysis using the function kmeans in the package cluster. The data are: x = c(-0.26, -0.23, -0.05, -0.20, 0.30, -0.84, -0.10, -0.12, 0.10, -0.31, -0.19, 0.18, -0.26, -0.23, -0.37, -0.23) I've got two different solutions when I ran this function over a few times: kmeans(x, centers=2) The first solution gives the following: $cluster [1]

Hi, The help file on princomp says that 'The signs of the columns of the loadings and scores are arbitrary, and so may differ between differnt programs for PCA, and even between different builds of R'. Does anyone know 1. Whether this applys to all functions like svd, eigen ... etc? 2. During a leave-one-out cross step, I notice the loadings also change sige when a different

Hi, I know there must be a way to do this, but I went through a couple 'Intro to R' books and didn't see how to do this. How do I move/copy objects from one work space to another? I have been saving the objects I want to move/copy separately then load them into another work space. Is there a more direct way to do this? Thanks! Anne [[alternative HTML version deleted]]

Hi, I have a problem using the function 'reshape' for the following dataset: input: X Y Z T.U.1 T.U.2 T.V.1 T.V.2 1.00 1.00 A 24.94 24.74 34.65 35.33 1.00 3.00 A 26.03 25.87 25.76 26.12 1.00 1.00 B 24.76 24.63 34.34 34.48 1.00 3.00 B 26.15 25.98 25.96 25.66 2.00 1.00 A 24.40 24.26 34.55