spec.pred.func: Special Predictor Function for Dataprep
Description
This function is called by dataprep to handle special predictors
in the process of setting up the dataset to be loaded into synth.
It should not be called manually by the normal user.
Abadie, A. and Gardeazabal, J. (2003) Economic Costs of Conflict: A Case Study of the Basque Country
American Economic Review 93 (1) 113--132
http://ksghome.harvard.edu/~.aabadie.academic.ksg/ecc.pdf
Abadie, A., Diamond, A., Hainmueller, J. (2007) Synthetic Control Methods
for Comparative Case Studies: Estimating the Effect of California's Tobacco Control Program
NBER Technical Working Paper no 335http://www.people.fas.harvard.edu/~jhainm/
##---- Should be DIRECTLY executable !! ----##-- ==> Define data, use random,##-- or do help(data=index) for the standard data sets.## The function is currently defined as