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\newblock R package version 3.1-7.

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\newblock {\em Test theory: {A} unified treatment}.
\newblock L. Erlbaum Associates, Mahwah, N.J.

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\newblock {R Foundation for Statistical Computing}, Vienna, Austria.

\bibitem[\protect\astroncite{Revelle}{2016}]{psych}
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\newblock {\em psych: Procedures for Personality and Psychological Research}.
\newblock Northwestern University, Evanston,
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\newblock R package version 1.6.4.

\bibitem[\protect\astroncite{Revelle and Zinbarg}{2009}]{rz:09}
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\newblock Coefficients alpha, beta, omega and the glb: comments on {Sijtsma}.
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\bibitem[\protect\astroncite{Zinbarg et~al.}{2005}]{zinbarg:pm:05}
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\bibitem[\protect\astroncite{Zinbarg et~al.}{2006}]{zinbarg:apm:06}
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