Hello,

I have a question about the formula of the density function for "sstd"
distribution implemented in rugarch package.

For example, assuming:
> z=-1
> g=2
> v=3
shouldn't the formula:
> 2/(g+g^(-1)) * ddist("std", y=(g*z), mu=0, sigma=1, shape=v)
return the same result as:
> ddist("sstd", y=z, mu=0, sigma=1, skew=g, shape=v)
 according to the transformation (58) presented in "Introduction to the
rugarch package (Version 1.2-1)" (page 15)?

 I'm getting different results... perhaps because I don't understand
correctly the mechanism of obtaining the "sstd" density.
 What formula should I use then, if I want to obtain "sstd" density using
the "std" density function?

Best regards,
Weronika

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