Measurement quality has recently been highlighted as an important concern for advancing a
cumulative psychological science. An implication is that researchers should move beyond …

A common way to form scores from multiple-item scales is to sum responses of all items.
Though sum scoring is often contrasted with factor analysis as a competing method, we …

Cronbach's alpha (α) is a widely-used measure of reliability used to quantify the amount of
random measurement error that exists in a sum score or average generated by a multi-item …

Measurement is fundamental to all research in psychology and should be accorded greater
scrutiny than typically occurs. Among other claims, McNeish and Wolf (Thinking twice about …

Across all sciences, the quality of measurements is important. Survey measurements are
only appropriate for use when researchers have validity evidence within their particular …

Empirical studies in psychology commonly report Cronbach's alpha as a measure of internal
consistency reliability despite the fact that many methodological studies have shown that …

Cronbach's alpha as a reliability estimate for a set of items has been repeatedly criticised.
Using McDonald's omega or the Greatest Lower Bound (GLB) has been suggested instead …

Reliability is a fundamental problem for measurement in all of science. Although defined in
multiple ways, and estimated in even more ways, the basic concepts seem straightforward …

The Cronbach's alpha is the most widely used method for estimating internal consistency
reliability. This procedure has proved very resistant to the passage of time, even if its …

The current conventions for test score reliability coefficients are unsystematic and chaotic.
Reliability coefficients have long been denoted using names that are unrelated to each …