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cigrainger/gist:b04cac5fea921267ddc2

Created August 14, 2014 15:28
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gistfile1.py
for firm in pd.unique(firms.bvdid):
firms.ix[((firms.bvdid==firm)&(firms.year==2004)),'stock'] = firms.stock[(firms.bvdid==firm)&(firms.year==2004)] + firms.patents[(firms.bvdid==firm)&(firms.year==2004)]
for i in range(2005,2014):
firms.ix[((firms.bvdid==firm)&(firms.year==i)),'stock'] = firms.stock[(firms.bvdid==firm)&(firms.year==i-1)] + firms.patents[(firms.bvdid==firm)&(firms.year==i)]
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