Programming the statistical procedures from SAS

What to do when two models have exactly same AIC/BIC and variance components estimations?

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What to do when two models have exactly same AIC/BIC and variance components estimations?

I have two models in NLMIXED (one linear-broken line and the other a quadratic broken-line) and they have the exactly same AIC, BIC and variance components. Their AIC, BIC are smaller than other models I am comparing them to. I am using this models to estimate nutritional requirements of animals. Now, I am normally reporting only the estimated requirement of the best fitting model. In this case, should I report both of them? Or there is any further analysis/investigation can be done to find which one is better?

Thank you,

Marcio


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‎07-22-2014 11:42 AM
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Re: What to do when two models have exactly same AIC/BIC and variance components estimations?

I would expect the quadratic to be more easily explainable in biological terms (at least if it is quadratic to a plateau).  Otherwise, linear is simpler to explain--there is an additive response above a certain cut-off.

Steve Denham

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Posts: 62

Re: What to do when two models have exactly same AIC/BIC and variance components estimations?

Hi,

One approach is focusing on the "Story Telling" side of your model.

Best,

Mohammad

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‎07-22-2014 11:42 AM
Respected Advisor
Posts: 2,655

Re: What to do when two models have exactly same AIC/BIC and variance components estimations?

I would expect the quadratic to be more easily explainable in biological terms (at least if it is quadratic to a plateau).  Otherwise, linear is simpler to explain--there is an additive response above a certain cut-off.

Steve Denham

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