Dear all,



*is there a simple way in R to add parameter restrictions to linear mixed
effects models. Specifically I would like to restrict slope coefficients to
be*

*b1<0 and 0<b2< -b1 and 0<b3< -b1-b2 and … and 0<b7< -b1-b2-b3-b4-b5-b6.*

* *

*Can I use lmeControl, optim, optimx? And How?*

* *

*Thanks,*

*Shu*

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