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Alpha is also a function of the number of items, so shorter scales will often have lower reliability estimates yet still be preferable in many situations because they are lower burden. An alternative way of thinking about internal consistency is that it is the extent to which all of the items of a test measure the same latent variable. The ...
Cronbach's alpha (Cronbach's ), also known as tau-equivalent reliability or coefficient alpha (coefficient ), is a reliability coefficient and a measure of the internal consistency of tests and measures. [1] [2] [3] It was named after the American psychologist Lee Cronbach.
Peterson and Seligman repeated this process until Cronbach's alpha for all scales exceeded 0.70. The researchers added three reverse-scored items in each of the 24 scales as well. The researchers added three reverse-scored items in each of the 24 scales as well.
Cronbach's alpha (internal reliability) measures the extent to which all the questions in a section measure the same construct/factor consistently. The five factors of the PIWBS showed excellent internal reliability, with Cronbach's alphas all above α = 0.85. The minimum accepted standard of internal reliability is α = 0.70.
It is a special case of Cronbach's α, computed for dichotomous scores. [2] [3] It is often claimed that a high KR-20 coefficient (e.g., > 0.90) indicates a homogeneous test. However, like Cronbach's α, homogeneity (that is, unidimensionality) is actually an assumption, not a conclusion, of reliability coefficients.
For the reliability of a two-item test, the formula is more appropriate than Cronbach's alpha (used in this way, the Spearman-Brown formula is also called "standardized Cronbach's alpha", as it is the same as Cronbach's alpha computed using the average item intercorrelation and unit-item variance, rather than the average item covariance and ...
Likert scales typically range from 2 to 10 – with 3, 5, or, 7 being the most common. [14] Further, this progressive structure of the scale is such that each successive Likert item is treated as indicating a 'better' response than the preceding value. (This may differ in cases where reverse ordering of the Likert scale is needed).
The SSQ respondents use a 6 -point Likert scale to indicate their degree of satisfaction with the support from the above people ranging from "1 - very dissatisfied" to "6 - very satisfied". [ 2 ] The Social Support Questionnaire has multiple short forms such as the SSQ3 and the SSQ6.
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