Filtering of genes based on number of non-available expression values.
This function can be used to exclude genes with a large number of expression values not available.
filter.NA(eset,thres=0.25)
eset |
object of the class “ExpressionSet”. |
thres |
threshold for excluding genes. If the percentage
of missing values (indicated by NA in the expression matrix)
is larger than |
The function produces an object of the ExpressionSet class. It is the same as the input eset object, except for the genes excluded.
Matthias E. Futschik (http://www.sysbiolab.eu)
if (interactive()){
data(yeast) # data set includes 17 measurements
yeastF <- filter.NA(yeast) # genes are excluded if more than 4 measurements are missing
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