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help for sbri 
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Spearman-Brown reliability

        sbri [, obs(#) format(%fmt) ]

Description

    sbri calculates the Spearman-Brown reliability. It must be used after
    xtreg with the mle (maximum-likelihood random-effects estimator) option.
    It is an immediate command.

Options

    obs(#) specifies the number of repeated measurements. The default is
        e(g_avg).

    format(%fmt) specifies the display format for presenting numbers. The
        default is %3.2f.

Examples

    use http://www.stata-press.com/data/r9/auto7
    loneway mpg manufacturer_grp if nummake == 4
    xtreg mpg if nummake == 4 , i(manufacturer_grp) mle
    sbri

Authors

    Nicola Orsini, Division of Nutritional Epidemiology, IMM, Karolinska
    Institutet, Sweden

Also see
 
    Manual:  [U] 23 Estimation and post-estimation commands,
             [U] 29 Overview of Stata estimation commands,
             [XT] xtreg

    Online:  help for loneway , xtreg