SPLITHALF: Stata module to compute split-half reliability

Ariel Linden ()
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Ariel Linden: Linden Consulting Group, LLC

Statistical Software Components from Boston College Department of Economics

Abstract: splithalf computes split-half reliability to assess the internal consistency of a scale or test composed of multiple items. It involves dividing the items into two halves (which can be performed either deterministically or randomly) and computing the correlation between the total scores for each half. A high correlation suggests that the items are measuring the same underlying construct. splithalf computes (1) the correlation between the two half scores, (2) the Spearman-Brown prophecy formula to estimate full-scale reliability from the half-test correlation and (3) the Horst reliability coefficient which adjusts for unequal-length halves.

Language: Stata
Requires: Stata version 11
Keywords: split half reliability; correlation; Spearman-Brown prophecy; Horst coefficient (search for similar items in EconPapers)
Date: 2025-10-18
Note: This module should be installed from within Stata by typing "ssc install splithalf". The module is made available under terms of the GPL v3 (https://www.gnu.org/licenses/gpl-3.0.txt). Windows users should not attempt to download these files with a web browser.
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http://fmwww.bc.edu/repec/bocode/s/splithalf.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/s/splithalf.sthlp help file (text/plain)

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