@Reference(authors="F. J. Rohlf",title="Methods of comparing classifications",booktitle="Annual Review of Ecology and Systematics",url="http://dx.doi.org/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) / Math.sqrt((m - tie) * m);
}

@ Reference ( authors = "F. J. Rohlf" , title = "Methods of comparing classifications" , booktitle = "Annual Review of Ecology and Systematics" , url = "http://dx.doi.org/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 ) / Math . sqrt ( ( m - tie ) * m ) ; }
compute the tau correlation measure
