A filter to select genes based on there being a gap.
gapFilter looks for genes that might usefully discriminate
between two groups (possibly unknown at the time of filtering).
To do this we look for a gap in the ordered expression values. The gap
must come in the central portion (we exclude jumps in the initial
Prop values or the final
Alternatively, if the IQR for the gene is large that will also pass
our test and the gene will be selected.
The size of the gap required to pass the test.
The size of the IQR required to pass the test.
The proportion (or number) of samples to exclude at either end.
As stated above we are interested in
A function that returns either
FALSE depending on
whether the vector supplied has a gap larger than
Gap or an IQR
(inter quartile range) larger than
IQR. For computing the gap we
want to exclude a proportion,
Prop from either end of the sorted
values. The reason for this requirement is that genes which differ in
expression levels only for a few samples are not likely to be interesting.
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