Cronbach's alpha measures internal consistency of tests and measures. Named after American psychologist Lee Cronbach. First published in 1951 with additional derivation
Reliability and validity are essential for measuring social science constructs. A reliable but invalid scale may measure the wrong construct. A valid but unreliable scale may measure the wrong construct inconsistently
Reliability measures consistency of a measure, while validity indicates accuracy. A measurement can be reliable without being valid, but validity usually indicates reliability. Reliability is easier to assess than validity but more important
Cronbach's alpha measures internal consistency of tests between 0 and 1. Reliability indicates consistency of test measurements, not validity. Alpha is easier to calculate than test-retest reliability estimates
Scale developed to assess adult spiritual well-being in Turkey. Initial 49-item scale reduced through expert feedback. Final scale contains 29 items across three dimensions
Validity measures how well a test accurately assesses its intended construct. A valid test ensures results accurately reflect the dimension being assessed