Page "Psychometrics" Paragraph 21

Internal consistency, which addresses the homogeneity of a single test form, may be assessed by correlating performance on two halves of a test, which is termed split-half reliability ; the value of this Pearson product-moment correlation coefficient for two half-tests is adjusted with the Spearman – Brown prediction formula to correspond to the correlation between two full-length tests.

Perhaps the most commonly used index of reliability is Cronbach's α, which is equivalent to the mean of all possible split-half coefficients.

Other approaches include the intra-class correlation, which is the ratio of variance of measurements of a given target to the variance of all targets.