st: Standard error of prediction minus constant?

[Berk Sensoy <berksensoy@gmail.com>]

Hi everyone

Suppose I run

y = a + bx

the predict command with the stdp option  will produce the standard
errors of the predicted values yhat

But what I want is the standard errors of yhat - ahat, or in other
words the standard errors of bhat times x.  How do I do this?

Thanks

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