Returns the similarity between two quantitative variables, two qualitative variables or a quantitative variable and a qualitative variable. The similarity between two variables is defined as a square cosine: the square of the Pearson correlation when the two variables are quantitative; the correlation ratio when one variable is quantitative and the other one is qualitative; the square of the canonical correlation between two sets of dummy variables, when the two variables are qualitative.

1 | ```
mixedVarSim(X1, X2)
``` |

`X1` |
a vector or a factor |

`X2` |
a vector or a factor |

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