I don't have access to this journal. What significance
procedure justifies their claim?
Nick
[email protected]
[email protected]
> Elizabeth said:
> Using former posts from Statlist, I've found I need to use
> the command intreg because a Tobit will not produce robust
> st. errors.
>
> I want just let you know something related to this issue
> (althought no Stata code is provided):
>
> Quote from the abstract: "this paper attempts to apply
> symmetrically trimmed least squares estimation as a
> semi-parametric estimation of the Tobit model in order to
> model firms' R&D expenditures with zero values. The result of
> specification test indicates the semi-parametric estimation
> outperforms the parametric ML estimation significantly."
>
> Full reference:
> Scientometrics, Vol. 69, No. 1 (2006) 57�67
> A semi-parametric modeling of firms' R&D expenditures with zero values
> SEUNG-HOON YOO & HYE-SEON MOON
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
