```Date: Mon, 2 Jul 2007 21:43:30 -0400 Reply-To: Wensui Liu Sender: "SAS(r) Discussion" From: Wensui Liu Subject: Re: simultaneous equation model questions Comments: To: rong.guo@gmail.com In-Reply-To: <1183386311.779863.323810@w5g2000hsg.googlegroups.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed yes, I think you can still use proc model, or proc nlmixed. On 7/2/07, rong.guo@gmail.com wrote: > On Jun 28, 4:10 pm, shilin...@yahoo.com wrote: > > On Jun 28, 12:20 pm, rong....@gmail.com wrote: > > > > > > > > > Greetings! > > > > > I am doing a project that needs to run asimultaneousequation model. > > > Since this is the first time I deal withsimultaneousequation, I have > > > some questions and any help on this is highly appreciated! > > > > > Let me briefly introduce what I am doing here. There are two decision > > > variables: "percentage to buy" and "premium", which will be the > > > dependent variable in theequations, so there are two linearequations > > > in thissimultaneousmodel. "percentage to buy" and "premium" each > > > depends on some variables, and at the same time, they also depend on > > > each other. > > > > > I listed all the variables in theequationsto illustrate the > > > relationship. As you can see, premium and pct_buy are the dependent > > > variable in one equation, but they are also independent variable in > > > the other equation. And the 2equationsshare a common independent > > > variable "offer", and they each also has its own independent > > > variable. > > > > > equation 1: > > > dependent variable: pct_buy > > > independent variables: offer, liquidity, premium > > > > > equation 2: > > > dependent variable: premium > > > independent variables: offer, size, pct_buy > > > > > I need to run asimultaneousequation to reflect this scenario. I am > > > thinking that PROC CALIS might be able to help me, and tried to set up > > > a model, but I am sure it is not complete. Can anyone please take a > > > look and let me know if I am on the right track, and give me some > > > hints on improving the model setup? > > > > > proc calis data= bank.offer; > > > var premium pct_buy offer size liquidity; > > > lineqs > > > premium = b1 offer + b2 size + b3 pct_buy + e1, > > > pct_buy = b4 offer + b5 liquidity + b6 premium + e2; > > > run; > > > > > Thanks so much! > > > > > Rong > > > > I am not sure for proc calis , but I am sure the proc model can do it > > -- wthich is in SAS/ETS pakage. > > > > HTH > > Thanks for your reply. I looked over PROC MODEL, and looks like it > handles nonlinear equations. The 2 equations in my model are either > both OLS models, or one is OLS, and the other is PROBIT. In such case, > can I still use PROC MODEL? > > THANKS! > -- WenSui Liu A lousy statistician who happens to know a little programming (http://spaces.msn.com/statcompute/blog) ```

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