are.pargam.valid: Are the Distribution Parameters Consistent with the Gamma Distribution
Description
The distribution parameter object returned by functions of this package such as by
pargam are consistent with the corresponding distribution,
otherwise a list would not have been returned. However, other
functions (cdfgam, quagam, and
lmomgam require consistent parameters to return the cumulative
probability (nonexceedance), quantile, and L-moments of the distribution,
respectively. These functions internally use the are.pargam.valid
function. The FORTRAN source code of Hosking provides the basis
for the function. The parameters are restricted to the following conditions.
$$\alpha > 0 \mbox{ and } \beta > 0\mbox{.}$$
Usage
are.pargam.valid(para,nowarn=FALSE)
Arguments
para
A distribution parameter list returned by pargam.
nowarn
A logical switch on warning surpression. If TRUE then options(warn=-1) is made and restored on return. This switch is to permit calls in which warnings are not desired as the user knows how to handle the returned value---say in a
Value
TRUEIf the parameters are gam consistent.
FALSEIf the parameters are not gam consistent.
References
Hosking, J.R.M., 1996, FORTRAN routines for use with the method of L-moments:
Version 3, IBM Research Report RC20525, T.J. Watson Research Center,
Yorktown Heights, New York.
Hosking, J.R.M. and Wallis, J.R., 1997, Regional frequency analysis---An
approach based on L-moments: Cambridge University Press.