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`SiteStatistics`

computes site-wise statistics, including:

- Number of sites without gap,
- Number of complete sites (no gap, no unresolved character),
- Number of complete sites with only one state (constant sites),
- Number of complete sites with only two states (biallelic sites),
- Number of complete sites with only three states (triallelic sites),
- Number of complete sites with all four states (quadriallelic sites),
- Number of parsimony-informative sites.

The statistics are computed for a given subset of species (typically forming a ingroup).

maf.filter= \ [...], SequenceStatistics( \ statistics=(\ \ [...], SiteStatistics( \ species=species1), \ [...]), \ ref_species=species1, \ file=data.statistics.csv), \ [...] |

`species={list}`

A list of species to be considered in the statistics calculations.