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Classically, a Likert scale was composed of the sum of many Likert items (ordinal ratings of the amount of agreement with a statement), where all the items were equally valid. Today the term sometimes is used synonymously with 'ordinal rating scale' (which may be based on only 1 item).

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How did Likert calculate sigma values in his original 1932 paper?

(q in P) { cat (p, q, E(p, q), "\n") p <- p + q } Output: 0 0.13 -1.62727 0.13 0.43 -0.4252946 0.56 0.21 0.4322558 0.77 0.13 0.9857673 0.9 0.1 1.754983 Online sources: Likert
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