in reply to Annoying error although module is installed

In addition to the import techniques described above you may instead specify the module in the call:

use Statistics::Basic::StdDev;
my $stddev = Statistics::Basic::StdDev::stddev(1,2,3);

print $stddev."\n";

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which helps maintenance in a large script by making it clear where stddev comes from.

Premature optimization is the root of all job security

In Section Seekers of Perl Wisdom