This function implements the original definition of the three-dimensional Kolmogorov-Smirnov test by Peacock (1983). This test is not the widely used Fasano-Franceschini test (1987). The latter is a variant the Peacock test.

1 | ```
peacock3(x, y)
``` |

`x` |
x is the object representing the first sample. x should be able to be converted a matrix, where each row represents a sample point. If the object cannot be converted to a matrix, the function will stop and throw an error message. Pleaste note that only the first three columns of the matrix will be used, and the rest columns are just ingored. |

`y` |
Similar to x, y is the object representing the second sample. |

the value of the test statistic

Yuanhui Xiao

1 2 3 4 |

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