Callender and Osburn (Educational and Psychological Measurement,
1977, 37, 819-825) developed a method for estimating maximized lambda4, the
greatest split-half reliability coefficient among all possible split halves
for a scale. The method is quite tedious to do by hand, and the authors
At 01:49 PM 11/19/01 -0500, Wuensch, Karl L wrote:
Callender and Osburn (Educational and Psychological Measurement,
1977, 37, 819-825) developed a method for estimating maximized lambda4, the
greatest split-half reliability coefficient among all possible split halves
for a scale
Dennis asked how do we know what a test's true reliability is?
Osburn knew because he simulated true-score covariance matrices and
from these obtained observed score covariance matrices as a function of the
true-score matrices and hypothetical values of reliability. More details
are in
