[William Lisowski]

All I can tell you is when you have a fixed effects model, any variable that, for every panel, has the same value in every observation within the panel, will be collinear with the fixed effects.

You need to open the Data Browser window and look at your data for some panels and see if this is happening with av_expert or with raverage.

[yang yu]

All I can tell you is when you have a fixed effects model, any variable that, for every panel, has the same value in every observation within the panel, will be collinear with the fixed effects.

You need to open the Data Browser window and look at your data for some panels and see if this is happening with av_expert or with raverage.

Thanks mate. i decide to ignore this variable.