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
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. The