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Hi and thanks to all R developers and helpers, I wanrt to take the 1 and 3 dimensions of this object to create a new one without the years and with the next functions to do some specific calculations: > str(PMpa) num [1:499105, 1:60, 1:12] 29.8 55.8 29.7 25.1 25 ... - attr(*, "dimnames")=List of 3 ..$ punt: NULL ..$ any : chr [1:60...

Hello everyone, I have 3 variables Y, X1 and X2. Each variables lies between 0 and 1. I want to do a constrained regression such that a>0 and (1-a) >0 for the model: Y = a*X1 + (1-a)*X2 I tried the help on the constrained regression in R but I concede that it was not helpful. Any help is greatly appreciated -- Thanks, Jim. [[alternative HTML version deleted]]