## Non linear least squares for a system of equations

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sofiafi
Posts: 3
Joined: Wed May 01, 2019 7:19 am

### Non linear least squares for a system of equations

Hi, I am new to Eviews and I am trying to estimate 3 parameters using 3 non linear equations. I clicked on Object -> System and specified the 3 equations as well as the initial values for the 3 parameters. However, after I click Estimate, there is no option for NLLS in the Estimation method. If I choose OLS will Eviews automatically run the NLLS method because the equations are nonlinear? Is there another way to estimate the 3 parameters using NLLS in Eviews?

EViews Gareth
Fe ddaethom, fe welon, fe amcangyfrifon
Posts: 12261
Joined: Tue Sep 16, 2008 5:38 pm

### Re: Non linear least squares for a system of equations

EViews will automatically use Nlls

sofiafi
Posts: 3
Joined: Wed May 01, 2019 7:19 am

### Re: Non linear least squares for a system of equations

Thank you. When I click estimate I get an error message "no valid observations in equation".

EViews Gareth
Fe ddaethom, fe welon, fe amcangyfrifon
Posts: 12261
Joined: Tue Sep 16, 2008 5:38 pm

### Re: Non linear least squares for a system of equations

Sounds like you have all NAs for data or at the initial parameter values

sofiafi
Posts: 3
Joined: Wed May 01, 2019 7:19 am

### Re: Non linear least squares for a system of equations

Do you mean NAs while estimating? Because there are no NAs in my data. How do I overcome this problem?

Thank you

EViews Gareth
Fe ddaethom, fe welon, fe amcangyfrifon
Posts: 12261
Joined: Tue Sep 16, 2008 5:38 pm

### Re: Non linear least squares for a system of equations

Hard to say without the data and specification