Reliability of Difference Scores 2.1
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Publisher: Marley W. Watkins
File size: 1.26MB
OS: Windows Vista, 2003, XP, 2000, 98, Me, NT
Date added: 2009-10-27
Homepage: http://www.public.asu.edu/~mwwatkin/Watkins3.html
Category: Home & Education
Reliability of Difference Scores 2.1 Description
"A standalone Windows program that calculates the reliability of difference score"
A standalone Windows program that calculates the reliability of difference scores, given the reliability of two tests and the correlation Between those two tests.
A difference score is obtained by subtracting one test score from another test score. For example, a student's IQ Test score and Reading test score. This might be interpreted as the difference between ability and achievement.
A difference score is, like the test scores from which it was calculated, unreliable to some extent. Its reliability will be a function of the reliability of the tests used in its computation and the correlation between the scores from the two tests used in its computation as per: Rd = (.5 (Rxx + Ryy) - Rxy) รท 1 - Rxy. you can free download Reliability of Difference Scores 2.1 now.
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