This is Perl module Statistics::Zscore. INSTALLATION Statistics::Zscore installation is straightforward. If your CPAN shell is set up, you should just be able to do % cpan Statistics::Zscore Download it, unpack it, then build it as per the usual: % perl Makefile.PL % make && make test Then install it: % make install DOCUMENTATION Statistics::Zscore documentation is available as in POD. So you can do: % perldoc Statistics::Zscore to read the documentation online with your favorite pager. takeshi miki