salary. 1990 salary, thousands $
pcsalary. percent change salary, 89-90
sales. 1990 firm sales, millions $
roe. return on equity, 88-90 avg
pcroe. percent change roe, 88-90
ros. return on firm's stock, 88-90
indus. =1 if industrial firm
finance. =1 if financial firm
consprod. =1 if consumer product firm
utility. =1 if transport. or utilties
lsalary. natural log of salary
lsales. natural log of sales