library( systemfit )
data( kmenta )
attach( kmenta )
demand <- q ~ p + d
supply <- q ~ p + f + a
inst <- ~ d + f + a
labels <- list( "demand", "supply" )
system <- list( demand, supply )
## perform 2SLS on each of the equations in the system
fit2sls <- twostage.systemfit( system, inst, labels, kmenta )
## print the results
print( fit2sls )
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