search for: chrysain

Hi, I would like to run random Forest classification algorithm and check the accuracy of the prediction according to different training and testing schemes. For example, extracting 70% of the samples for training and the rest for testing, or using 10-fold cross validation scheme. How can I do that? Is there a function? Thanks a lot, Chrysanthi. [[alternative HTML version deleted]]

Dear all, I want to work with R in an optimization problem and I was wondering if there are any available solvers. I found RCplex package but downloading it, I get problems. Why? Is it not free? are there any other solvers available? many thanks! -- View this message in context: http://r.789695.n4.nabble.com/Cplex-solver-and-optimization-in-R-tp3703385p3703385.html Sent from the R help

Hello, I am a phd student in Bioinformatics and I am using the Random Forest package in order to classify my data, but I have some questions. Is there a function in order to visualize the trees, so as to get the rules? Also, could you please provide me with the code of "randomForest" function, as I would like to see how it works. I was wondering if I can get the classification having

...ynou Thiam Gueye Rue de Thies Point E, BP 15702 CP 12524 Dakar Fann Senegal Phone: +221 33 869 3986 Email: f.wouterse@cgiar.org     [[alternative HTML version deleted]] ------------------------------ Message: 82 Date: Wed, 8 Jul 2009 19:38:23 +0100 From: "Chrysanthi A." <chrysain@gmail.com> Subject: [R] heatmap.2: question regarding the "raw z-score" To: r-help@r-project.org Message-ID:     <66b602900907081138h1a579341u1789a9a8988e4e@mail.gmail.com> Content-Type: text/plain Hi, I am analysing gene expression data using the heatmap.2 function in R and I...

Dear all, I am working with randomForest package and I am interested in examining the "Gini importance" measures that are used as a general indicator of feature relevance. Is there a possibility of getting the Gini measure that is being estimated in each tree by the output of the getTree() function? Thanks a lot, Chrysanthi [[alternative HTML version deleted]]

Hi, I am analysing gene expression data using the heatmap.2 function in R and I was wondering what is the formula of the "raw z-score" bar which shows the colors for each pixel. According to that post: https://mailman.stat.ethz.ch/pipermail/r-help/2006-September/113598.html, it is the (actual value - mean of the group) / standard deviation. But, mean of which group? Mean of the gene