The functions or variables listed here are no longer part of 'gdata'.

1 | ```
aggregate.table(x, by1, by2, FUN=mean, ...)
``` |

`x` |
data to be summarized |

`by1` |
first grouping factor. |

`by2` |
second grouping factor. |

`FUN` |
a scalar function to compute the summary statistics which can
be applied to all data subsets. Defaults to |

`...` |
Optional arguments for |

`aggregate.table(x, by1, by2, FUN=mean, ...)`

should be replacede
by `tapply(X=x, INDEX=list(by1, by2), FUN=FUN, ...)`

.

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