Computes the correlation between a composite and a vector of items.

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`r_mat` |
A correlation matrix. |

`a` |
The items used for composite A specified as a vector of column numbers. |

`wt_a` |
A vector containing the weights of each item in composite A. |

`output` |
Output can be set to "mat", to return a matrix made up of the newly generated correlations appened to the original correlation matrix. |

A vector of correlation coefficients.

Allen Goebl and Jeff Jones

Lord, F.M. & Novick, M.R. (1968). *Statisticl theories of
mental test scores.*, 97-98.

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