# Math Help - Summing Regressors in a regression

1. ## Summing Regressors in a regression

Can you sum the co-efficients on regressors to get a better approximation of something? And then get the 95% confidence interval?

If so how would you do this?

To me this would be a problem as you can't sum standard errors which are necessary for getting the confidence interval? So you would need the standard errors of the sum of the regressors???