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Returns starting values and limits (boundaries) for the parameters of
distance functions. This function is called by
other routines in Rdistance, and is not intended to
be called by the user. Replace this function in the global
environment to change boundaries and starting values.
startLimits(ml)A list containing the following components
Vector of starting values for parameters of the likelihood and expansion terms.
Vector of lower limits for the likelihood parameters and expansion terms.
Vector of upper limits for the likelihood parameters and expansion terms.
Vector of names for the likelihood parameters and expansion terms.
The length of each vector in the return is:
(Num expansions) + 1 + 1*(like %in% c("hazrate")) + (Num Covars).
Either a Rdistance 'model frame' or an Rdistance
'fitted object'. Both are of class "dfunc".
Rdistance 'model frames' are lists containing components
necessary to estimate a distance function, but no estimates.
Rdistance 'model frames' are typically
produced by calls to parseModel.
Rdistance 'fitted objects'
are typically produced by calls to dfuncEstim.
'Fitted objects' are 'model frames'
with additional components such as the parameters estimates,
log likelihood value, convergence information, and the variance-
covariance matrix of the parameters.
dfuncEstim
data(sparrowDf)
# Half-normal start limits
modList <- parseModel(
data = sparrowDf
, formula = dist ~ 1
, likelihood = "halfnorm"
)
startLimits(modList)
# Half-normal with expansions
modList <- parseModel(
data = sparrowDf
, formula = dist ~ 1
, likelihood = "halfnorm"
, expansions = 3
)
startLimits(modList)
# Hazard rate start limits
modList$likelihood <- "hazrate"
startLimits(modList)
# Neg exp start limits
modList$likelihood <- "negexp"
startLimits(modList)
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