A vector that consists initial values for mu and sigma.
Arguments
ydata
The variable to be modeled
fd
A string that specifies the parent distribution.
sd
A string that specifies the sub-family distribution.
skew
If ture, the starting values will be generated for the finited tailed distribution case.
Details
The start values for the location parameter in a null model are
the median of the empirical distribution, and a starting value for the dispersion parameter based on a
specific quantile of the empirical distribution, specified according to the theoretical distribution
on which the model is based.
The start values for all new predictor coefficients in both the location and dispersion
submodels are assigned the value 0.1.