R: Compute Approximate Quantiles of Non-Central t Distribution

qtAppr {DPQ} | R Documentation

## Compute Approximate Quantiles of Non-Central t Distribution

### Description

Compute quantiles (inverse distribution values) for the non-central t distribution. using Johnson,Kotz,.. p.521, formula (31.26 a) (31.26 b) & (31.26 c)

Note that `qt(.., ncp=*)` did not exist yet in 1999, when MM implemented `qtAppr()`.

### Usage

    qtAppr(p, df, ncp, lower.tail = TRUE, log.p = FALSE, method = c("a", "b", "c"))

### Arguments

`p` | vector of probabilities.
`df` | degrees of freedom > 0, maybe non-integer.
`ncp` | non-centrality parameter delta; ....
`lower.tail, log.p` | logical, see, e.g., `qt()`.
`method` | a string specifying the approximation method to be used.

### Value

...

### Author(s)

Martin Maechler, 6 Feb 1999

### See Also

`qt`.

### Examples

      ## TODO

[Package DPQ version 0.4-4 Index]