Testing the eqaulity of two coefficient in the model

[cmli4]

When we are testing the eqaulity of two coefficient in the model .
let's say B2=B3

H_0:B2=B3
H_A:B2 not equal B3

Assume using F-test

Why should we force B2 and B3 to be equal by summing up variable X2 and X3 .
Then do regression .

Why don't we multiply X2 and X3 instead???And run a regression ,then use it as our restricted model??

[Dragan]

Why don't we multiply X2 and X3 instead???And run a regression ,then use it as our restricted model??

cmli4: The answer is obvious. Just look at the F-Ratio in my previous response to your question:

http://www.talkstats.com/showthread.php?t=13631