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...3 + s(age), family=Gamma(link ="identity"), weights=days) If I add for example an additional variable, say M7, the error-message occures. If I add M7 in combination with for example M8 it works. Does somebody know, how to supply starting values or how to handle this problem. I didn?t suxceed by adding control=gam.control(spIterType="outer"), or by sp=137722.1 Thank you very much, Bj?rn