# Apply a function to subsets

### Description

Generic functions for applying a function to subsets of a data set.

### Usage

1 2 3 |

### Arguments

`x` |
the |

`design` |
a character, logical or numeric vector specifying the variables (columns) used for subsetting. |

`fun` |
a function to be applied to the subsets. |

`simplify` |
a logical indicating whether the results should be simplified to a vector or matrix (if possible). |

`...` |
additional arguments to be passed to |

### Value

For `simApply`

a `data.frame`

.

For `simSapply`

, a list, vector or matrix (see `sapply`

).

### Methods for function simApply

`x = "data.frame", design = "BasicVector", fun = "function"`

apply a function to subsets given by the variables (columns) in

`design`

.`x = "data.frame", design = "Strata", fun = "function"`

apply a function to subsets given by

`design`

.

### Methods for function simSapply

`x = "data.frame", design = "BasicVector", fun = "function"`

apply a function to subsets given by the variables (columns) in

`design`

.`x = "data.frame", design = "Strata", fun = "function"`

apply a function to subsets given by

`design`

.

### Author(s)

Andreas Alfons

### See Also

`sapply`

### Examples

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