User: Adaikalavan RAMASAMY

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15 years, 11 months ago
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Posts by Adaikalavan RAMASAMY

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Multiple hypothesis correction and pairwise tests
... Dear all, Apologies if this is off-topic but I have been pondering about multiple correction procedures when multiple groups are involved. In a microarray context, say we have 20000 probes/genes and the responses are either Grade 1, 2, 3 (assume all arrays correspond to some tumor). The null hypot ...
microarray written 15.9 years ago by Adaikalavan RAMASAMY80 • updated 15.9 years ago by yuanji@mdanderson.org10
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Answer: A: diff (Beginner's question)
... 3rd line of the "Value" section of help(diff) : " If x is a matrix then the difference operations are carried out on each column separately. " i.e. the difference returned as c( row2 -row1, row3 - row2, row4 - row3, ... ) and naturally row_(n+1) - row_n is undefined as there is no row_(n+1), thus ...
written 16.0 years ago by Adaikalavan RAMASAMY80
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Statisticians - Genome Institute of Singapore
... Genome Institute of Singapore (GIS) Biostatistics Group The Genome Institute of Singapore ( http://www.gis.a-star.edu.sg ) is looking for statisticians who are interested in a wide range of biomedical probems. We are especially interested in hearing from senior researchers interested in leading ...
sequencing genetics cancer written 16.1 years ago by Adaikalavan RAMASAMY80
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Answer: A: Normalization
... The Average Difference value you describe is generated by MAS 4.0 algorithm which fairly outdated. The newer algorithm, MAS 5.0, uses Ideal Mismatch values to force the resulting signal to be very small positive values. [ Even then there is some evidence this algorithm is suboptimal ] Some referenc ...
written 16.1 years ago by Adaikalavan RAMASAMY80
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Answer: A: Searching BioC mailing lists
... Dear all, Running Google Advanced search (http://www.google.com/advanced_search) with the domain as suggested by Gordon works fine for my searching. Thanks to all thos who replied. -- Adaikalavan Ramasamy -----Original Message----- From: Gordon Smyth [mailto:smyth@wehi.edu.au] Sent: Wednesday, O ...
written 16.1 years ago by Adaikalavan RAMASAMY80
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Searching BioC mailing lists
... Is there a search facility for the past BioConductor mails similar to R's search engine (eg http://www.google.com/u/newcastlemaths) ? I managed to find https://www.stat.math.ethz.ch/pipermail/bioconductor/ which seems to be an archive without any search facilities. Can anyone help ? -- Adaikalava ...
written 16.1 years ago by Adaikalavan RAMASAMY80
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Summary: Combining HGU133A & HGU133B data
... Dear all, Many thanks for all your response. I have to agree with Huber and Crispin on normalizing the data before combining it. However Laurent, thank you for the interesting codes. After combining the data, I will look at the correlation of the redundant genes (on Unigene terms) for each A-B pai ...
written 16.2 years ago by Adaikalavan RAMASAMY80
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Combining HGU133A & HGU133B data
... Dear all, I have been asked to analyze the data where samples were hybridized on both HGU133A and HGU133B Affymetrix chips. One option is to analyze the A and B chips seperately but this is not desirable. The other option is to combine both (using something akin to "rbind") to combine these data. ...
hgu133a hgu133b written 16.2 years ago by Adaikalavan RAMASAMY80 • updated 16.2 years ago by Crispin Miller1.1k

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Popular Question 15.9 years ago, created a question with more than 1,000 views. For Combining HGU133A & HGU133B data

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