Description Usage Arguments Details Value See Also Examples

A data frame is split according to some variables in a formula, and a sample of a certain fraction of each is drawn.

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`formula` |
A formula defining the grouping of the data frame. |

`frac` |
The part of data to be sampled. |

`replace` |
Is the sampling with replacement. |

`data` |
A data frame. |

`systematic` |
Should sampling be systematic. |

If systematic=FALSE (default) then frac gives the fraction of data sampled. If systematic=TRUE and frac=.2 then every 1/.2 i.e. every 5th observation is taken out.

A dataframe.

`summaryBy`

, `orderBy`

,
`splitBy`

, `transformBy`

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