docs: @Reference(authors = "F. J. Rohlf", title = "Methods of comparing classifications", //
        booktitle = "Annual Review of Ecology and Systematics", //
        url = "https://doi.org/10.1146/annurev.es.05.110174.000533", //
        bibkey = "doi:10.1146/annurev.es.05.110174.000533")
    public double computeTau(long c, long d, double m, long wd, long bd) {
      double tie = (wd * (wd - 1) + bd * (bd - 1)) >>> 1;
      return (c - d) / FastMath.sqrt((m - tie) * m);
      // return (4. * c - m) / m;
    }