Near Singular Matrix, dummy trap

[BGstudent]

Hi,

I have the following equation:
"TDA=c firm_size profitability tangibility current_ratio dep_totalassets earnings_volatility year08 year09 year10 year11 year12 year13"
Where yearXX are dummies and after I remove them the regressions run without problems. Also when I exclude the constant C, there is no problem. So it appears there is multicollinearity between the dummies and C.
I need t run OLS, fixed & random effect on the equation above. It is panel data, balanced for 6 years.
This is my first time with EViews, would appreciate any help or advice. I will check previous post as well.

Rado

ps I am using EViews 7.2

[startz]

As you surmise, there is perfect multicollinearity between the year dummies and the constant. Leave one out.

[BGstudent]

Thank you, actually it is only the last dummy year13, I will just drop it.

[startz]

You can probably drop any year, but dropping the last one is fine.