Really not sure I can help, but the Spearman-Brown remembered me of:
-l1way- estimates one-way analysis of variance (ANOVA) models and use the random effects ANOVA model to estimate the intra-class (within group) correlation, and the reliability of group averages from the Spearman-Brown prophecy formula
-iclassr- estimates one-way analysis of variance (ANOVA) models and use the random effects ANOVA model to estimate the intra-class (within group) correlation, and the reliability of group averages from the Spearman-Brown prophecy formula (faster but limited to fewer than 376 values of the grouping variable)
-iclassr2- calculates the intra-class correlation for paired measurements or assessments. It also reports the reliability of the mean of the two measurements as estimated from the Spearman-Brown prophecy formula. Missing values are handled by casewise deletion
The are all available from STB-35 sg65 (more on them in http://www.stata.com/products/stb/journals/stb35.pdf).
Nicola
P.S. I'll NOT receive/read any email but the Digest.
At 02.33 03/01/2009 -0500, you wrote:
>Does anyone know of an - ado - file that can calculate the Rwg of James
>et al. (1984), preferably with the maximum variance distribution and the
>Spearman-Brown Correction (as detailed by Lindell and colleagues)?
>
>Reference: James, L. R., Demaree, R. G., & Wolf, G. 1984. Estimating
>within-group interrater reliability with and without response bias.
>Journal of Applied Psychology, 69, 85-98
>
>Lindell, M. K., & Brandt, C. J. (1999). Assessing interrater agreement
>on the job relevance of a test: A comparison of the CVI, T, rwgj, and
>r*wgj indexes. Journal of Applied Psychology, 84, 640-647.
>
>Lindell, M. K., Brandt, C. J., & Whitney, D. J. (1999). A revised index
>of interrater agreement for multi-item ratings of a single target.
>Applied Psychological Measurement, 23, 127-135.
>
>Thanks,
>John.
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