[R] License for including datasets in packages

[Arne Henningsen]

Dear All,

I would like to publish a function for 'heckit' estimations together with two 
examples from Greene's and Wooldridge's econometric textbooks. 
These examples use the dataset of Mroz (1987) that is also available in John 
Fox' "car" package. However, not all variables that are used in my examples 
are available in the "car" package. Therefore, I want to put the full Mroz 
dataset in my package. This full dataset can be downloaded from some internet 
sites (e.g. pages.stern.nyu.edu/~wgreene/Text/econometricanalysis.htm, 
www.stata.com/texts/eacsap/), but I did not find any license information. 

Whom do I have to ask wether I am allowed to put these data in a GPLed R 
package? (Mr. Mroz, Mr. Greene, STATA, University of Michigan (PSID), . . . )

@John: Do you have any license information on these data?

Thanks,
Arne

-- 
Arne Henningsen
Department of Agricultural Economics
University of Kiel
Olshausenstr. 40
D-24098 Kiel (Germany)
Tel: +49-431-880 4445
Fax: +49-431-880 1397
ahenningsen at agric-econ.uni-kiel.de
http://www.uni-kiel.de/agrarpol/ahenningsen/