My apologies for lack of clarity and thanks to Chris for clarifying. These
cases are all known to be positive because they were taken from patients that
were shown to have the disease via surgery and/ or autopsy.
One of the open questions that the study would like to address is how best
to dichotomize the results--this is the issue of lumping high and medium or
not. So one in a sense has two diagnostics tests and two ways of aggregating
the high, medium and low results into a positive or negative.
I'm a sociologist/ environmental scientist so forgive my not providing a
description clear to those of you in the clinical and biomedical sciences.
Best,
Tom Dietz
Professor of Sociology and Crop and Soil Sciences
Acting Director of the Environmental Science and Policy Program
Acting Associate Dean for Environmental Science and Policy, College of
Agriculture and Natural Resources, College of Natural Science, College of
Social Science
Michigan State University
Off campus phone: 802-372-4389
Off campus fax: 802-372-4389
Email: [email protected]
Office: 118 Linton
On campus phone: 517-355-0302
On campus fax: 517-353-3355
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
