# qtAppr

From DPQ v0.3-3
by Martin Maechler

##### Compute Approximate Quantiles of Non-Central t Distribution

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()`

.

- Keywords
- distribution

##### 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

...

##### See Also

`qt`

.

##### Examples

```
# NOT RUN {
## TODO
# }
```

*Documentation reproduced from package DPQ, version 0.3-3, License: GPL (>= 2)*

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