[R] Significance testing for paired counts data with small sample size and some genuine zero values

From: michael watson (IAH-C) <michael.watson_at_bbsrc.ac.uk>
Date: Tue, 04 Mar 2008 15:24:29 +0000


Dear All

I will try and keep this succinct! The data is counts of a particular molecule in different cell types taken from the same 5 subjects. The data are paired as they come from the same subject. The aim is to determine whether the cell types differ in terms of the abundance of each of the molecules.

I first thought of a paired two-sample t-test for each pairing of cell types, but cannot log the data due to the presence of zero values.

Next was the idea of the wilcoxon signed-rank test, but that would not work with such small sample sizes.

Two questions:

  1. what is the best way to analyse these data?
  2. (more general) what is the best approach when one wishes to log counts data that contains genuine zero values?

Many thanks
Mick

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