I get it; you love Perl, are fascinated by the language, cheer for its success, and feel it should have more tutorials.

You're also interested in learning how to deal with CSV and STATA data. You're familiar with PDL and PDL::Stats, so you also know about CPAN.

I'm a little bewildered why you haven't used http://search.cpan.org to discover Text::CSV and Parse::Stata::DtaReader. They both come with decent documentation, and the modules' authors wrote the documentation for the purpose of assisting users in learning to utilize these tools.

The Perl community, like most informal programming communities, relies on every day users, like yourself, for producing tutorials in the specific areas of their own interest. I suggest you read the documentation on those modules, search, research, practice, try, and learn. Once you've become comfortable with the problem domain, contribute that tutorial yourself.

If I were to write a tutorial for you, that's what I would have to do; read, search, research, practice, try, and learn... then contribute. But in the end I would have learned more in producing a tutorial than you would learn reading it. Don't deprive yourself the opportunity to maximize your own learning. If it interests you, and you are willing to put in the work to learn, then you will qualify yourself to contribute a tutorial. That's how people "give back" in the Perl community.