Steve, Thanks for the reply. I should've used my more complicated example, because what you're saying is accurate. They would cancel out. I'll use a few actual numbers here. I have 2 long linear combinations of numbers that I can get down to this formula: 9* (x1) + 3*( x4 ) = 0 The reason why the 9 and the 3 are important is that they are indicators of time (months), so if I omit those constants, I am allowing x1, for example, to have the same "effect" as x4, for example. x1 and x4 in this example are each something that reflects a 1 month change. So in order to talk about the estimated effect of that 9 month time period, I need to multiply x1 by 9. Similarly in order to talk about the estimated effect of the entire 3 month time period, I need to multiply the x4 by 3. I'm trying to use this test to compare the actual predicted values I calculated. Thanks in advance for any suggestions or comments if I'm thinking about this in the wrong way!

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