Calculates the difference between the proportion of minorities in populaiton and the proportion of minorities among the representatives.

1 | ```
diffScore(Z,R)
``` |

`Z` |
Population vector |

`R` |
Vector for the representatives |

The majority group must be in first position of the vector. All groups in positions 2 to n are considered minority groups; no test is applied to check whether the groups are numerical minorities.

Difference in proportions

Didier Ruedin

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