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.\" ========================================================================
.\"
.IX Title "Statistics::Basic::Mean 3pm"
.TH Statistics::Basic::Mean 3pm "2012-01-23" "perl v5.14.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
Statistics::Basic::Mean \- find the mean of a list
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
Invoke it this way:
.PP
.Vb 1
\&    my $avg = mean(1,2,3);
.Ve
.PP
Or this way:
.PP
.Vb 2
\&    my $v1  = vector(1,2,3);
\&    my $avg = avg($v1);
.Ve
.PP
And then either query the values or print them like so:
.PP
.Vb 3
\&    print "The mean of $v1: $avg\en";
\&    my $mq = $avg\->query;
\&    my $m0 = 0+$avg;
.Ve
.PP
Create a 20 point moving average like so:
.PP
.Vb 1
\&    use Statistics::Basic qw(:all nofill);
\&
\&    my $sth = $dbh\->prepare("select col1 from data where something");
\&    my $len = 20;
\&    my $avg = mean()\->set_size($len);
\&
\&    $sth\->execute or die $dbh\->errstr;
\&    $sth\->bind_columns( my $val ) or die $dbh\->errstr;
\&
\&    while( $sth\->fetch ) {
\&        $avg\->insert( $val );
\&        if( defined( my $m = $avg\->query ) ) {
\&            print "Mean: $m\en";
\&        }
\&
\&        # This would also work:
\&        # print "Mean: $avg\en" if $avg\->query_filled;
\&    }
.Ve
.SH "METHODS"
.IX Header "METHODS"
.IP "\fB\f(BInew()\fB\fR" 4
.IX Item "new()"
The constructor takes a single array ref or a single
Statistics::Basic::Vector as arguments.  It returns a
Statistics::Basic::Mean object.
.Sp
Note: normally you'd use the \fImean()\fR
constructor, rather than building these by hand using \f(CW\*(C`new()\*(C'\fR.
.IP "\fB\f(BI_OVB::import()\fB\fR" 4
.IX Item "_OVB::import()"
This module also inherits all the overloads and methods from
Statistics::Basic::_OneVectorBase.
.SH "OVERLOADS"
.IX Header "OVERLOADS"
This object is overloaded.  It tries to return an appropriate string for the
calculation or the value of the computation in numeric context.
.PP
In boolean context, this object is always true (even when empty).
.SH "AUTHOR"
.IX Header "AUTHOR"
Paul Miller \f(CW\*(C`<jettero@cpan.org>\*(C'\fR
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2012 Paul Miller \*(-- Licensed under the \s-1LGPL\s0
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIperl\fR\|(1), Statistics::Basic, Statistics::Basic::_OneVectorBase, Statistics::Basic::Vector