Methods for returning the first parts of an object

Get the first-order inclusion probabilities from a vector of probability weights.

1 | ```
inclusionProb(prob, size)
``` |

`prob` |
a numeric vector of non-negative probability weights. |

`size` |
a non-negative integer giving the sample size. |

A numeric vector of the first-order inclusion probabilities.

This is a faster C++ implementation of
`inclusionprobabilities`

from package `sampling`

.

Andreas Alfons

1 2 | ```
pweights <- sample(1:5, 25, replace = TRUE)
inclusionProb(pweights, 10)
``` |

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