cops | R Documentation |
Returns a vector similar to coefs() comprising the centre of the parameter space (COPS) values, given a fitted VGLM regression.
cops(object, ...)
copsvglm(object, beta.range = c(-5, 6),
tol = .Machine$double.eps^0.25,
dointercepts = TRUE, trace. = FALSE,
slowtrain = FALSE, ...)
object |
A |
beta.range |
Numeric.
Interval for the numerical search.
After a little scaling, it is effectively
fed into |
tol |
Numeric.
Fed into |
dointercepts |
Logical.
Compute the COPS for the intercepts?
This should be set to |
trace. |
Logical. Print a running log? This may or may not work properly. |
slowtrain |
Logical.
If |
... |
currently unused but may be used in the future for further arguments passed into the other methods functions. |
For many models, some COPS values will be
Inf
or -Inf
so that manual checking is needed,
for example, poissonff
.
Each value returned may be effectively
that of beta.range
or NA
.
The answers returned by this function only
make sense if the COPSs are in the
interior of the parameter space.
A named vector, similar to coefvlm
.
If trace.
then a list is returned,
having a componennt comprising a
matrix of function evaluations used by
optimize
.
This function is experimental and can be made to run more efficiently in the future.
Thomas W. Yee.
Yee, T. W. (2021). Some new results concerning the Hauck-Donner effect. Manuscript in preparation.
hdeff
.
coefvlm
,
coef
.
## Not run: data("xs.nz", package = "VGAMdata")
data1 <-
na.omit(xs.nz[, c("age", "cancer", "sex")])
fit1 <- vglm(cancer ~ age + sex, binomialff,
data = data1)
cops(fit1)
## End(Not run)
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