Get cell means for unique groups of covariates

Get number of units in each cell

1 | ```
getCellSizes(x, n, factor.groups)
``` |

`x` |
a matrix-like object containing the covariates. |

`n` |
the total number of units. |

`factor.groups` |
a factor of unique groups of covariates. |

the number of units in each cell.

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