'------------ SUR Estimation ------------ 
INPATH C:\Program Files\Betahat4.0
OPEN POOL20.DT1
USE 1 20

'Define equations.
GE_EQ.LS    GE_INVEST      CONSTANT GE_VALUE      GE_STOCK      / NOESTIMATE
WEST_EQ.LS  WEST_INVEST    CONSTANT WEST_VALUE    WEST_STOCK    / NOESTIMATE
GM_EQ.LS    GM_INVEST      CONSTANT GM_VALUE      GM_STOCK      / NOESTIMATE
CHRY_EQ.LS  CHRY_INVEST    CONSTANT CHRY_VALUE    CHRY_STOCK    / NOESTIMATE
STEEL_EQ.LS USSTEEL_INVEST CONSTANT USSTEEL_VALUE USSTEEL_STOCK / NOESTIMATE

'Linear SUR.  The default iters over Sigma is 1 unless the SITERS option is used.  This way a linear
'   SUR doesn't give FIML results by accident.
SYSTEM GE_EQ WEST_EQ GM_EQ CHRY_EQ STEEL_EQ