A statistical measure of internal consistency reliability that indicates how closely related a set of items are as a group. Values range from 0 to 1, with higher values indicating that items in a scale measure the same underlying construct.
Named after Lee Cronbach who introduced this coefficient in 1951, though the mathematical foundation was developed earlier. 'Alpha' refers to the Greek letter α used in the statistical formula, and it became the gold standard for assessing scale reliability in psychology.
It's like checking if all questions on a 'happiness scale' actually measure happiness rather than random things! A Cronbach's alpha of .70 is considered acceptable, but .90+ means your items are almost measuring the same thing—sometimes too similar to be useful.
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