Description Usage Arguments Details Value Author(s) References See Also

This function calculates the effective number of parties with incomplete data, as introduced by Taagepera (1997). It can be used to estimate the effective number of groups in a population.

1 | ```
neffIncomp(x)
``` |

`x` |
Population vector, the residual category (‘other’) needs to be last |

This function calculates the number of effective parties if data are incomplete, i.e. if there is a residual category (‘other’). This function can be used to enumerate the effective number of parties, but also the effective number of groups in a population or representative body.

Note that the residual category is assumed to be the last item in the population vector. The best estimate (`Neff`

) may be incorrect if certain small parties or groups are listed for historical (or other) importance. In this case, the error range would be underestimated.

Returns a list: `Neff`

gives the best estimate (in the absence of other information), `simple`

does not square the residual category, `low`

treats the residual category a group on its own, `least`

assumes the groups in the residual category to be at least as big as the smallest group given, and `high`

excludes the residual category.

Didier Ruedin

Taagepera, R. (1997) Effective Number of Parties for Incoplete Data. Electoral Studies 16(2): 145-51.

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