User: Tom R. Fahland

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Posts by Tom R. Fahland

<prev • 6 results • page 1 of 1 • next >
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Answer: A: KNN, SVM, and randomForest - How to predict samples without category
... By definition, in supervised learning you always train (with known catagories), then run your unbiased data through for prediction. Both CV and train/test partitions are good for choosing parameters and optimizing the algorithms. I have just completed a study predicting dose expsoure with good reasu ...
written 15.2 years ago by Tom R. Fahland60
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Answer: A: Hierarchical clustering and shrinking centroids...
... Tan I have been doing a lot of classification using PAMR, as well as LDA and SVM's. The overused phrase the data is what it is is valid here. I look at highly correlated samples that mis-classify, and they are usually the same with differnet classification algorithms. Sometimes I don't get really g ...
written 15.3 years ago by Tom R. Fahland60
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Classification question
... All I had a quick question about how you might best solve a classification problem. I have some ideas, but wanted to run it by the group to see their thoughts. I have animal data containing different doses of a substance and also have multiple time points for each dose (with replicates). I am inte ...
dose written 15.5 years ago by Tom R. Fahland60
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Answer: A: reading in a text file
... Just read the file in as a dataframe, read.table, then you can use data.matrix to convert to numerical data. Tom Fahland -----Original Message----- From: Jamila Ahdidan [mailto:jammam2@yahoo.com] Sent: Friday, March 05, 2004 06:12 To: Bioconductor@stat.math.ethz.ch Subject: [BioC] reading in a text ...
written 15.6 years ago by Tom R. Fahland60
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Answer: A: mas5calls now almost like affymetrix's
... I had a question relating to comparing a couple different normalizations (like mas5 vs rma). If I used the default affy software, it produces P,M,A values for each (as does mas5value call) expression measurement. But what is a good method to reject measurements after rma is called since that doesn't ...
written 15.6 years ago by Tom R. Fahland60
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Answer: A: trouble installing "affy" package
... I got that error also. I installed Biobase by the usual "R CMD.." method, then affy and it worked for me. (don't ask me why). PS. What package(s) do people find the most useful for general Gene expression data analysis once they have normalized data. I'm looking at supclust, pamr, etc from R Cran a ...
written 15.6 years ago by Tom R. Fahland60

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