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Many thanks. I appreciate it. Cheers.

Many thanks for directing to me towards detailed discussion on imposing restrictions. I found the relevant specification for me is the following. ai = exp( bi ) / ( exp( b1 ) + exp( b2 ) + ... + exp( bk ) ) , where ai > 0 a1+a2+...+ak=1 Could you please help me to apply this rule in the following mo...

Deal all, Can anyone please help me how to impose a restriction in a linear model? I have the following model in that sum of the coefficients add up to one: y=c(1)*x + (1-c(1))*z. I need to impose another restriction so that both coefficients have to be non-negative. Any comments would be greatly ap...