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The Spearman–Brown prediction formula, also known as the Spearman–Brown prophecy formula, is a formula relating psychometric reliability to test length and used by psychometricians to predict the reliability of a test after changing the test length. [1] The method was published independently by Spearman (1910) and Brown (1910). [2] [3]
The package hermiter [20] computes fast batch estimates of the Spearman correlation along with sequential estimates (i.e. estimates that are updated in an online/incremental manner as new observations are incorporated). Stata implementation: spearman varlist calculates all pairwise correlation coefficients for all variables in varlist.
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The Spearman, an alternate title for the Shaw Brothers film Flag of Iron; Spearman–Brown prediction formula, a formula relating psychometric reliability; Spearman's rank correlation coefficient, a non-parametric test statistic
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Charles Edward Spearman, FRS [1] [3] (10 September 1863 – 17 September 1945) was an English psychologist known for work in statistics, as a pioneer of factor analysis, and for Spearman's rank correlation coefficient.
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Closely related to Spearman's hypothesis is the hypothesis that the magnitude of certain group differences correlates with within-group heritability estimates. Arthur Jensen and J. Phillippe Rushton , for example, reported in 2010 that the found psychometric meta-analytic correlation between g-loadings and heritability estimates was 1.