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06-05-2012 07:37 AM

Hi,

I am using bound statement in proc model to restrict the sign of a coefficient for e.g Coeff (b) > 0. In the output it shows, coeff of b as 1.0e-8 which i thought meant solution with this bound couldn't be found but also in that output i have coefficient of that bound which is positive. Could you please help me how we interpret this?

Thanks in advance for all the help.

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06-05-2012 08:05 AM

Since you bound the parameter to be greater than zero, the estimate is indeed greater than zero. Unfortunately, its effect is essentially zero, and if you removed the bound, it may very likely be negative. I would consider reparameterizing the model so that one of two things happens: you don't need a bounds statement, or the parameter b is not included. Since I can imagine that the model is fairly complex, this may be much more difficult to do than to simply say "Parameter b has no effect."

Steve Denham