EViews.com

Hi,
I am trying to estimate the optimal lag length in a VAR estimation. However, when I open the lag length window I don't understand how is expressed the estimation sample. I would like to input as estimation sample 1985q1 2016q1, the problem is that when I write those dates in the estimation sample box and press ok EViews tells me that this date expression is "illegal". And when I click on lag length this is what comes out in the estimation sample box:

VAR Type:

unrestricted VAR
Vector Errror Correction
Bayesian VAR

Estimation sample :
1 125


Lag intervals for Endogenous:
1 2

Endogenous Variables:

Exogenous Variables:
c

Could you please help me to figure it out what does it mean and how I have to write the estimation period?
Thank you.

Have you correctly specified workfile structure?

All my data are expressed as it follows 1985 Q1 to 2016 Q1. I've also checked the spreadsheet.

I meant the structure of Eviews workfile. In the upper left corner of the workfile, range should display 1985Q1 2016Q1 in your case.

Thank you I have fixed the problem as you suggested.