firm identifier
=1 if major merger
employees in 1000s
return on stock, %
patents applied for
patents granted
price common stock
R&D expend, current mill $
R&D expend, 1972 mill $
stock of R&D
sales, current mill. $
4 digit industry
72 through 81
log(1+rnd)
log(sales)
log(1+patents)