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Statistics::Basic::StdUser3Contributed Perl DocumeStatistics::Basic::StdDev(3)

NAME
       Statistics::Basic::StdDev - find	the standard deviation of a list

SYNOPSIS
       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:

	   use Statistics::Basic qw(:all nofill);

	   my $sth = $dbh->prepare("select col1	from data where	something");
	   my $len = 20;
	   my $std = stddev()->set_size($len);

	   $sth->execute or die	$dbh->errstr;
	   $sth->bind_columns( my $val ) or die	$dbh->errstr;

	   while( $sth->fetch )	{
	       $std->insert( $val );
	       if( defined( my $s = $std->query	) ) {
		   print "StdDev: $s\n";
	       }

	       # This would also work:
	       # print "StdDev:	$s\n" $std->query_filled;
	   }

METHODS
       new()
	   The constructor takes a list	of values, a single array ref, or a
	   single Statistics::Basic::Vector as arguments.  It returns a
	   Statistics::Basic::StdDev object.

	   Note: normally you'd	use the	mean() constructor, rather than
	   building these by hand using	"new()".

       query_mean()
	   Returns the Statistics::Basic::Mean object used in the standard
	   deviation computation.

       _OVB::import()
	   This	module also inherits all the overloads and methods from
	   Statistics::Basic::_OneVectorBase.

OVERLOADS
       This object is overloaded.  It tries to return an appropriate string
       for the calculation or the value	of the computation in numeric context.

       In boolean context, this	object is always true (even when empty).

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 2012 Paul Miller -- Licensed under the	LGPL

SEE ALSO
       perl(1),	Statistics::Basic, Statistics::Basic::_OneVectorBase,
       Statistics::Basic::Vector

perl v5.24.1			  2012-01-23	  Statistics::Basic::StdDev(3)

NAME | SYNOPSIS | METHODS | OVERLOADS | AUTHOR | COPYRIGHT | SEE ALSO

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