[R] R formula

[tzygmund mcfarlane]

You got the order of the arguments wrong:
##################################
library(systemfit)
eqDemand <- consump ~ price + income
eqSupply <- consump ~ price + farmPrice + trend
fitsur <- systemfit(list(demand=eqDemand, supply=eqSupply), "SUR", data=Kmenta)
summary(fitsur)
##################################

On Tue, Aug 18, 2009 at 9:48 AM, Anwesha Chakrabarti<c.anwesha at gmail.com> wrote:
> 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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>
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