Chau,
I recall a gamma chart as a statistical tool comparing two variables in a
matrix format. You use a "P" table (columns, I think) and a "Q" table
(rows, I think) to exhaust all potential combinations. You construct the
"P" table by multiplying each number by a summed set of numbers below
and to the right. You construct the "Q" table by multiplying each number
by the summed set of numbers below and to the left. You can then
determine the correlation between the variable by using the formula:
gamma = (P-Q)/(P+Q)
The resulting number can show either a positive or negative correlation.
The magnitude of the number determines the strength of the correlation.
(0-.34 is weak, .35-.74 is moderate, .75-1.0 is strong)
Does that help?
Regards,
Tom O'Rourke
Total Quality Organization
Bowie, MD
On Thu, 6 May 1999, Chau Nguyen wrote:
> I was asked to create a Gamma chart, and really have no idea where to find
> more information about this type of chart. I know that "gamma" belongs to
> physics, but other than that, i'm clue less.
--"Tom O'Rourke" <torourke@polaris.umuc.edu>
Learning-org -- Hosted by Rick Karash <rkarash@karash.com> Public Dialog on Learning Organizations -- <http://www.learning-org.com>