This function calculates the group-mean reliability from a linear mixed effects (lme) model. If group sizes are identical, the group-mean reliabilty estimate equals the ICC(2) estimate from an ANOVA model. When group sizes differ, however, a group-mean reliability estimate is calculated for each group based on the group size. The group-mean reliability estimate for each group is based upon the Spearman-Brown formula, the overall ICC, and group size for each group.

1 | ```
GmeanRel(object)
``` |

`object` |
A Linear Mixed Effect (lme) object. |

`ICC` |
Intraclass Correlation Coefficient |

`Group` |
A vector containing all the group names. |

`GrpSize` |
A vector containing all the group sizes. |

`MeanRel` |
A vector containing the group-mean reliability estimate for each group. |

Paul Bliese paul.bliese@moore.sc.edu

Bliese, P. D. (2000). Within-group agreement, non-independence, and reliability: Implications for data aggregation and Analysis. In K. J. Klein & S. W. Kozlowski (Eds.), Multilevel Theory, Research, and Methods in Organizations (pp. 349-381). San Francisco, CA: Jossey-Bass, Inc.

Bartko, J.J. (1976). On various intraclass correlation reliability coefficients. Psychological Bulletin, 83, 762-765.

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