rig {VGAM} | R Documentation |
Estimation of the parameters of a reciprocal inverse Gaussian distribution.
rig(lmu = "identity", llambda = "loge", emu=list(), elambda=list(), imu = NULL, ilambda = 1)
lmu, llambda |
Link functions for mu and lambda .
See Links for more choices.
|
imu, ilambda |
Initial values for mu and lambda .
A NULL means a value is computed internally.
|
emu, elambda |
List. Extra argument for each of the links.
See earg in Links for general information.
|
See Jorgensen (1997) for details.
An object of class "vglmff"
(see vglmff-class
).
The object is used by modelling functions such as vglm
,
and vgam
.
This distribution is potentially useful for dispersion modelling.
T. W. Yee
Jorgensen, B. (1997) The Theory of Dispersion Models. London: Chapman & Hall
y = rchisq(n=100, df=14) # Not 'proper' data!! fit = vglm(y ~ 1, rig, trace=TRUE) fit = vglm(y ~ 1, rig, trace=TRUE, eps=1e-9, cri="c") summary(fit)