This function provides three types of approximations of the distribution
function of Spearman's rho. Besides the two approximations
used in `cor.test(,method="spearman")`

, which are AS89 and the t-distribution,
this function allows to use precomputed null distribution for `n <= 22`

.
See `spearman.test`

for the details of the algorithm used to compute this
null distribution.

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`s` |
The observed value of S statistics |

`n` |
The number of observations. |

`lower.tail` |
If TRUE (the default), the probability of |

`approximation` |
Selection of the method of approximation of the distribution function. |

See `spearman.test`

for more detail.

Depending on `lower.tail`

, either the probability of `S <= s`

or of `S >= s`

is computed, where S is the statistics
`sum((rank(x) - rank(y))^2)`

.

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