Model functions
inv() function
inv(v[r])
forms the reciprocal of v + r.
This may also be used to transform the response variable.
log() function
log(v[r]
forms the natural log of v + r.
This may also be used to transform the response variable.
pow() function
pow(v,p[,r]
raises v + r.to power p.
This may also be used to transform the response variable.
This is equivalent to natural log transformation if
p is zero.
sqrt() function
sqrt(v[r])
forms the square root of v + r.
This may also be used to transform the response variable.
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