Paul Miller > Statistics-Basic-1.6607 > Statistics::Basic::Mean

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# NAME

Statistics::Basic::Mean - find the mean of a list

# SYNOPSIS

Invoke it this way:

`    my \$avg = mean(1,2,3);`

Or this way:

```    my \$v1  = vector(1,2,3);
my \$avg = avg(\$v1);```

And then either query the values or print them like so:

```    print "The mean of \$v1: \$avg\n";
my \$mq = \$avg->query;
my \$m0 = 0+\$avg;```

Create a 20 point moving average like so:

```    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\n";
}

# This would also work:
# print "Mean: \$avg\n" if \$avg->query_filled;
}```

# METHODS

new()

The constructor takes a single array ref or a single Statistics::Basic::Vector as arguments. It returns a Statistics::Basic::Mean object.

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

_OVB::import()

This module also inherits all the overloads and methods from Statistics::Basic::_OneVectorBase.

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>`