NAME

SYNOPSIS

    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

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

AUTHOR

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

SEE ALSO