Without more known about the underlying science,
it is difficult to comment.
But one answer is that you don't necessarily need
to do anything special. It is the conditional distribution
of response given predictors that is the stochastic side
of modelling, not the unconditional distribution. Besides,
a spike near the middle is not much of a pathology compared
with one at an extreme.
Incidentally, claims to urgency usually don't work: see
the well meant advice at
http://www.catb.org/~esr/faqs/smart-questions.html#urgent
Nick
n.j.cox@durham.ac.uk
Francesca Gagliardi
> I would be grateful if anyone could give me suggestions on
> how to deal with
> a dependent variable that has a mass point at zero and is continuosly
> distributed over negative and positive values. In such a
> case, which is the
> most appropriate model to estimate?
>
> It is really important for me to solve this problem as soon
> as possible and
> I thank in advance for any help you would give me on this matter.
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