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constrain eta?

NLME eta BSV

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#1 William R. Wolowich

William R. Wolowich

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Posted 06 July 2018 - 01:12 PM

Is there any way to constrain eta in NLME or does that violate some aspect of the diff solver? I sometimes get a subject with an eta that is magnitudes too large.



#2 smouksassi1

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Posted 06 July 2018 - 02:07 PM

Hi William, you can always use a transformation that constrains the parameter space to say [a-b] instead of [-inf,+inf].

But you need also to see why the individual subject data is giving you this very far ETA.

Having constraints on the ETA distribution is a departure from the normality or lognormality of your parameter distribution 

 

 

In simulation mode you can reject an eta and keep simulating but this require elaborate simulate statement
e.g. https://github.com/m...solve/issues/53mrgsolve has this functionality.
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