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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.
This software provides a comprehensive set of capabilities including frequencies, cross-tabs comparison of means (t-tests and one-way ANOVA), linear regression, logistic regression, reliability (Cronbach's alpha, not failure or Weibull), and re-ordering data, non-parametric tests, factor analysis, cluster analysis, principal components analysis, chi-square analysis and more.
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 .
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.
Cronbach’s alpha; Alpha-if-deleted; Full Pearson correlation matrix (item matrix) with levels of statistical significance; Autopsych also performs several Rasch-based functions, including: Basic Rasch many-facets analysis for differential item functioning (DIF) Fixed item equating for dichotomous item-response matrices; One-way ANOVA
Download QR code; Print/export Download as PDF; ... Excel [53] Maxima No Yes No No Yes No Common Lisp Common Lisp; MLAB: No Yes No Yes Yes No No No PDL: Yes [54] No ...
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 ...
The criteria for factor loadings is 0.70, any items with loadings less than 0.70 may be considered for removal, if removing the items can improve the reliability and validity over the required threshold. Further Construct reliability is assessed using Cronbach Alpha and Composite Reliability, the required value for both is 0.70. [14]