[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]
RE: st:Transformation for skewed variables with negative values?
Also, partially echoing Jeph Herrin, if everything is negative,
consider reversing signs. Sign is often a convention.
However, I would want really good grounds
for shifting origins, even if the origin were conventional.
That is, if x everywhere is greater than a, then (x - a) is
positive, but if a is just empirically determined, it can be
difficult to interpret (x - a) or to compare results with other
> I agree with Joseph's general stance on this question.
> Also, consider the alternative of a non-identity link
> and a -glm-, which often offers the advantages of
> a transformation without the disadvantages.
> However, more generally, I will add a plug for
> my package -transint- from SSC, which is just
> a help file with various comments on transformations.
> You can install it using -ssc-.
* For searches and help try: