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...8 8 ... $ time : Factor w/ 2 levels "120hr","24hr": 1 1 1 1 2 2 2 1 1 1 ... $ treatment: Factor w/ 2 levels "control","trt": 1 1 1 2 2 1 1 2 1 1 ... $ expREP : Factor w/ 3 levels "expREP1","expREP2",..: 1 1 1 3 1 1 1 1 2 2 ... $ techREP : Factor w/ 3 levels "techREP1","techREP2",..: 3 2 1 1 1 3 1 3 3 2 ... $ Y : num 14.4 14.1 14.2 13.8 14.1 ... Could someone please help with doing something like the following 1. I would like to find the median for each unique combination of factors using the dat...

Dear list, I read the SOM package manual but I don't understand how to perform (for example) 1) the SOM analysis on Iris data 2) with a visualization similar to that of figure 7 in http://www.cis.hut.fi/projects/somtoolbox/package/papers/techrep.pdf Any suggestion? Thanks in advance, Gianandrea -- View this message in context: http://www.nabble.com/Self-Organizing-Map-analysis-tp22306689p22306689.html Sent from the R help mailing list archive at Nabble.com.

Hi All, This is off topic, but we're drawing a blank here.. > In a presentation I'll be giving next week, I want to include a reference > to a good general text on computing sample sizes for standard experiments. > Can anyone recommend a good book to use for this purpose? > > Thanks, > > -Greg LEGAL NOTICE\ Unless expressly stated otherwise, this

Hello, I would like to test some learning algorithms (C5.0, or C4.5) using decision trees or neural network. I didn't find anything in the R documentation for functions to apply on datasets (well, English is not my mother tongue and I have some problems to understand some functions descriptions). Does anybody know where I can find anything about that ? Thank you very much, Thomas

Hi All I am really very interested in starting to use R within our company. I particularly like the open source nature of the product. My company is a medical research company which is part of the University of London. We conduct contract virology research for large pharma companies. My question is how do we validate this software? I wonder if anyone else has had the problem and might be able to