vgCheckPars {VarianceGamma} | R Documentation |
Given a putative set of parameters for the variance gamma distribution, the functions checks if the parameters are in the correct range, and if the set has the correct length of 4.
vgCheckPars(param, ...)
param |
Numeric. Putative parameter values for a Variance Gamma distribution. |
... |
Further arguments for calls to all.equal . |
The vector param
takes the form c(c, sigma, theta, nu)
.
If either sigma
or nu
is negative, then an error message
is returned.
If the vector param
has a length not equal to 4, then an error
message is returned.
A list with components:
case |
Whichever of 'error' or 'normal' is
identified by the function. |
errMessage |
An appropriate error message if an error was found,
the empty string "" otherwise. |
David Scott d.scott@auckland.ac.nz, Christine Yang Dong c.dong@auckland.ac.nz
vgCheckPars(c(0,1,0,1)) # normal vgCheckPars(c(0,0,0,1)) # error vgCheckPars(c(0,1,0,-2)) # error vgCheckPars(c(0,1,0)) # error