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-----Original Message-----
From: Phys-l [mailto:phys-l-bounces@phys-l.org] On Behalf Of
brian whatcott
Sent: Saturday, June 22, 2013 9:14 AM
To: Phys-L@Phys-L.org
Subject: Re: [Phys-L] Indicators of quality teaching
I found this explanation helpful.Perhaps you will indulge me a little
further:
Is the standard deviation calculated from the pre test, or
from the post test results?
Is the maximum possible score selected for the pre test, or
for the post test?
Brian Whatcott
On 6/22/2013 12:03 AM, John Clement wrote:
STD is standard deviation, which is calculated from theaggregate of scores.
Max score would be the maximum score attainable. So if you use theBut if the test is converted to a percentage then the max
raw score and there are 23 questions the max would be 23.
score would be 100.
get effect sizes greater than 1.
John M. Clement
Houston, TX
On 6/21/2013 7:19 PM, John Clement wrote [in part]:
Effect size = (post - pre)/STD
An effect size of 1 is considered enormous and many studies do not
get effect sizes larger than .5. Many PER practicioners
skewed by the
But this definition of gain has the problem that it is
homogeneity. Just a straight post-pre has a large dependencesize of the pre-test and also is highly dependent on class
on the pre test. So Hake came up with Hake gain or normalized gain.
Normalized Gain = (post-pre)/(max score - pre)
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