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L</weight> was provided and L</want_sum_weight> specified).

=item C<weight2>

A piddle containing the sum of the square of the weights in each bin
(only if L</weight> was provided and L</want_sum_weight2> specified).

=item C<mean>

A piddle containing the (possibly weighted) mean of the data in each bin.

=item C<dmin>

=item C<dmax>

Piddles containing the minimum and maximum values of the data in each bin.

=item C<imin>

=item C<nbins>

The index value associated with the first in-bounds index
in the statistics piddles, and the number of in-bounds bins.

=back

=head3 References

=over

=item [Chan83]

Chan, Tony F., Golub, Gene H., and LeVeque, Randall J., Algorithms for
Computing the Sample Variance: Analysis and Recommendations, The
American Statistician, August 1983, Vol. 37, No.3, p 242.

=item [West79]

D. H. D. West. 1979. Updating mean and variance estimates: an improved
method. Commun. ACM 22, 9 (September 1979), 532-535.

=item [Higham]

Higham, N. (1996). Accuracy and stability of numerical
algorithms. Philadelphia: Society for Industrial and Applied
Mathematics.

=item [Robinson]

Robinson, E.L., Data Analysis for Scientists and Engineers, 2016,
Princeton University Press. ISBN 978-0-691-16992-7.

=item [Bevington]

Bevington, P.R., Robinson, D.K., Data Reduction and Error Analysis for
the Physical Sciences, Second Edition, 1992, McGraw-Hill, ISBN
0-07-91243-9.

=back

=head1 BUGS AND LIMITATIONS

No bugs have been reported.

=head1 AUTHOR

Diab Jerius, E<lt>djerius@cpan.orgE<gt>

=head1 COPYRIGHT AND LICENSE

Copyright 2008 Smithsonian Astrophysical Observatory

CXC::PDL::Bin1D is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at
your option) any later version.

This program is distributed in the hope that it will be useful,
but without any warranty; without even the implied warranty of
merchantability or fitness for a particular purpose.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see L<http://www.gnu.org/licenses/>.

=head1 SUPPORT

=head2 Bugs

Please report any bugs or feature requests to bug-cxc-pdl-bin1d@rt.cpan.org  or through the web interface at: L<https://rt.cpan.org/Public/Dist/Display.html?Name=CXC-PDL-Bin1D>

=head2 Source

Source is available at

  https://gitlab.com/djerius/cxc-pdl-bin1d

and may be cloned from

  https://gitlab.com/djerius/cxc-pdl-bin1d.git

=head1 SEE ALSO

Please see those modules/websites for more information related to this module.

=over 4

=item *

L<CXC::PDL::Bin1D.pd|CXC::PDL::Bin1D.pd>

=back

=head1 AUTHOR

Diab Jerius <djerius@cpan.org>

=head1 COPYRIGHT AND LICENSE

This software is Copyright (c) 2021 by Smithsonian Astrophysical Observatory.