To easily obtain the entire HYPOELLIPSE distribution, you may wish to download and expand the file: hypoellipse.zip
Table of contents for HYPOELLIPSE.
Description of the weighted regression and quality estimation used in
HYPOELLIPSE.USGS
Open-File Report 84-766 (This is a 20MB pdf
file.)
(This program archive may also be
found here:
ftp://hazards.cr.usgs.gov/LAHR/iaspei_pgms_cd/hypoellipse/ )