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Manual for psimpoll and pscomb
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This option enables a transformation that gives rare types a lower value,
reducing their significance in the analysis. All values for a taxon are
reduced if the overall level of the frequency if the taxon is less than
0.2 times the overall frequency of the most abundant taxon. The measure
of frequency used here is the square of the sum of all the values for the
taxon divided by the sum of the squares of the values.
This option toggles `on' and 'off'.
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