# survregDtest

From survival v3.1-8
by Terry Therneau

##### Verify a survreg distribution

This routine is called by `survreg`

to verify that a distribution
object is valid.

- Keywords
- survival

##### Usage

`survregDtest(dlist, verbose = F)`

##### Arguments

- dlist
the list describing a survival distribution

- verbose
return a simple TRUE/FALSE from the test for validity (the default), or a verbose description of any flaws.

##### Details

If the `survreg`

function rejects your user-supplied distribution
as invalid, this routine will tell you why it did so.

##### Value

TRUE if the distribution object passes the tests, and either FALSE or a vector of character strings if not.

##### See Also

##### Examples

```
# NOT RUN {
# An invalid distribution (it should have "init =" on line 2)
# surveg would give an error message
mycauchy <- list(name='Cauchy',
init<- function(x, weights, ...)
c(median(x), mad(x)),
density= function(x, parms) {
temp <- 1/(1 + x^2)
cbind(.5 + atan(temp)/pi, .5+ atan(-temp)/pi,
temp/pi, -2 *x*temp, 2*temp^2*(4*x^2*temp -1))
},
quantile= function(p, parms) tan((p-.5)*pi),
deviance= function(...) stop('deviance residuals not defined')
)
survregDtest(mycauchy, TRUE)
# }
```

*Documentation reproduced from package survival, version 3.1-8, License: LGPL (>= 2)*

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