In her Physhare post of 6 Feb 2002 15:28:58-0600 titled "Q about
pretest score", Edie Dukek wrote: "Will someone please e-mail to me
the formula for finding percent of growth comparing results of a
pretest and results of a posttest?"
It's possible that Edie is requesting information on the "average
normalized gain" <g>, defined as the actual gain, %<Gain>, divided by
the maximum possible actual gain, %<Gain>max:
where %<posttest> and %<pretest> are the final (posttest) and initial
(pretest) class percentage averages.
For information on the rationale, use, and history of the normalized
gain see, e.g., Hake (2001) and Hake (2002).
Richard Hake, Emeritus Professor of Physics, Indiana University
24245 Hatteras Street, Woodland Hills, CA 91367
<rrhake@earthlink.net>
<http://www.physics.indiana.edu/~hake>
REFERENCES
Hake, R.R. 2001. "Suggestions for Administering and Reporting
Pre/Post Diagnostic Tests", unpublished; online as ref. 14 at
<http://physics.indiana.edu/~hake/> [TestingSuggestions051801.pdf.,
5/18/01, 44K] (42 references & footnotes, 31 hot-linked URL's].
Hake, R.R. 2002. "Lessons from the physics education reform effort."
Conservation Ecology 5(2): 28; online at
<http://www.consecol.org/vol5/iss2/art28>. "Conservation Ecology," is
a FREE "peer-reviewed journal of integrative science and fundamental
policy research" with about 11,000 subscribers in about 108
countries. The aforementioned issue 5(2) at
<http://www.consecol.org/Journal/vol5/iss2/index.html> contains a
special feature on "Interactive Science Education."