otutab_counts2freqs command
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11-Aug-2018 New paper describes octave plots for visualizing alpha diversity.

12-Jun-2018 New paper shows that one in five taxonomy annotations in SILVA and Greengenes are wrong.

18-Apr-2018 New paper shows that taxonomy prediction accuracy is <50% for V4 sequences.

05-Oct-2017 PeerJ paper shows low accuracy of closed- and open-ref. QIIME OTUs.

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24-Nov-2016
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USEARCH v11

otutab_counts2freqs command

See also
  OTU table
  OTU commands
  Making an OTU table (otutab command)

Convert OTU table from counts to frequencies. The input file must be in QIIME classic format.

The output file is specified by the -output option.

The output file is formatted in a modified QIIME classic format where the values are floating-point frequencies in the range 0.0 to 1.0.

Note that most USEARCH commands do not support OTU tables with frequencies. You can convert from frequencies to counts by using the otutab_freqs2counts command.

Example

usearch -otutab_counts2freqs otutable_counts.txt -output otutable_freqs.txt