These methods are a convenience short-cuts to
take samples from `data.set`

or `importer`

objects.
They result in a data set (`data.set`

object)
the rows of which are a sample of the complete
object.

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`x` |
a data frame. |

`size` |
an (optional) numerical value, the sample size,
defaults to the total number of rows of |

`replace` |
a logical value, determines whether sampling takes place with or without replacement. |

`prob` |
a vector of sampling probabities or NULL. |

A data frame.

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