Number of unique values

[UschiKlute]

After I counted the unique values myself I have noticed that the number for "uniq" seems to be 1 too high. Could you check this, please?
I used the commands
catmandu convert MARC to Breaker --handler marc < file1.mrc > file2.txt
and
catmandu breaker file2.txt > breaker.txt

[phochste]

Hi, from the documentation: https://metacpan.org/pod/Catmandu::Exporter::Stat

* the 'uniq%' and 'entropy' fields are estimated and are normally within 1% of the
  correct value (this is done to keep the memory requirements of this module low)

The use case for the Stats module is for huge datasets where not everything needs to fit into memory. The uniq fields are an approximation of the number of unique values and can be within +/- 1% of the actual value.