It means you're mixing lists and arrayrefs. You pass variance an arrayref, but you're processing @_ inside the subroutine.

If your lists of numbers are small, just use arrays/lists throughout. Otherwise, make sure you properly dereference your arrayrefs.

I'm sure CPAN has many such modules that will do these calculations for you if you want a tried & tested solution.

In reply to Re: variance calculation by FunkyMonk
in thread variance calculation by cdfd123

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