I am trying to estimate the a set of two parameters of a CES function:

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`Y = (((AL*L)^C(1)+(AK*K)^C(1))^(C(2)/C(1))+(AE*E)^C(2))^(1/C(2))`

The iteration stops abruptly due to division by 0. Can I limit the range of parameters to non-zero values?

I used the

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`param`

thank you.