Calculate the variance of a Net Promoter Score

This function calculates the Net Promoter Score variance, taking a `vector`

of length three, with numbers or proportions of *Detractors*, *Passives*, and *Promoters*, respectively.

1 | ```
npvar(x)
``` |

`x` |
A |

`numeric`

. The variance of the distribution, ranging from 0 to 1.

Brendan Rocks rocks.brendan@gmail.com

`nps.var`

, a version which works on raw Recommend responses

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