wald test sum of coefficients

[rbriceno]

Hello. I am running a regression (OLS) with the following representation: TIR = C(1) + C(2)*LIQ090 + C(3)*LOG(DUR) + C(4)*DR1 + C(5)*MON + C(6)*LIQ090*MON + C(7)*DR1*MON + C(8)*DR1*LIQ090

I want to test that the sum of C(2), C(6) and C(8) is negative. I tried with a joint Wald test using C(2) + C(6) +C(8) = 0, but then the question is: if I have a rejection of the null is the sum positive or negative? (I understand the test is two-tailed so both directions are possible).

Is there a way to test if the sum of the 3 coefficients is negative? I'm using Eviews 7.

Thanks.

[EViews Gareth]

http://forums.eviews.com/viewtopic.php?f=4&t=5266