Hi
I was trying to estimate simultaneous equation system in R using systemfit.
I used the following commands
>library(systemfit)
> data(Kmenta)
> attach(Kmenta)
 >eqDemand<-consump~price+income
> eqSupply<-consump~price+farmprice+trend
> fitsur<-systemfit("SUR",list(demand=eqDemand, supply=eqSupply))
and got the following error messege

Error in systemfit("SUR", list(demand = eqDemand, supply = eqSupply)) :
argument 'formula' must be an object of class 'formula' or a list of objects
of class 'formula'

Can anyone tell me how to overcome this problem?

regards
Anwesha

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