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2010 Dec 27
1
R-code to generate random rotation matrix for rotation testing
...dent standard-normal entries
R <- matrix(rnorm(16),ncol=4)
R <- qr.Q(qr(R, LAPACK = TRUE))
# Z shall be a random matrix with the same mean and covariance structure as Y
Z <- crossprod(R,Y)
}
#####
A suggestion for the procedure exists (in Dorum et al. http://www.bepress.com/sagmb/vol8/iss1/art34/ , end of chapter 2.1), but a hint to a (fast) implementation would be greatly appreciated.
Best regards and a happy new year,
Martin Krautschke
-----------------------
Martin Krautschke
Student at University of Vienna
--
Sicherer, schneller und einfacher. Die aktuellen Internet-Browse...
2007 Sep 03
0
buglet?? in nlme:::corRatio documentation
...Mats},
title = {Pixel-level Signal Modelling with Spatial Correlation for
Two-Colour
Microarrays},
journal = {Statistical Applications in Genetics and Molecular Biology},
year = {2005},
volume = {4},
number = {1}
timestamp = {2007.09.03},
url = {http://www.bepress.com/sagmb/vol4/iss1/art6}
}
2008 Jul 14
1
Analysis of poorly replicated array data
Greetings,
I have "inherited" a cDNA macroarray dataset that is structured as follows.
Three different stressors were tested. For each stressor, there are two
treatments (control and stressed). For each treatment, two biological
replicates exist, and these are paired (i.e., there is a stressed array for
colony A and a control array from this same colony). For one of these
samples,