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Statistics::Basic::StdDev.3pm
Langue: en
Version: 2009-05-02 (debian - 07/07/09)
Section: 3 (Bibliothèques de fonctions)
NAME
Statistics::Basic::StdDev - find the standard deviation of an arraySYNOPSIS
Invoke it this way:my $stddev = stddev(1,2,3);
Or this way:
my $v1 = vector(1,2,3); my $std = stddev($v1);
And then either query the values or print them like so:
print "The stddev of $v1: $std\n"; my $sq = $std->query; my $s0 = 0+$std;
Create a 20 point ``moving'' stddev like so:
my $sth = $dbh->prepare("select col1 from data where something"); my $len = 20; my $std = stddev(); $std->set_size($len); $sth->execute or die $dbh->errstr; $sth->bind_columns( my $val ) or die $dbh->errstr; my $count = $len; while( $sth->fetch ) { $std->insert( $val ); if( -- $count <= 0 ) { print "StdDev: $std\n"; } }
The full details are probably in the base module. If you have questions, just let me know.
AUTHOR
Paul Miller "<jettero@cpan.org>"I am using this software in my own projects... If you find bugs, please please please let me know. :) Actually, let me know if you find it handy at all. Half the fun of releasing this stuff is knowing that people use it.
COPYRIGHT
Copyright 2009 Paul Miller --- Licensed under the LGPLSEE ALSO
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