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...a = a0 + a1z b= b0 + b1z x and z are variables y the variable that I am trying to modelise a0, a1, b0 and b1 are parameters to determine. I am wondering if I can use nls and if so how do I have to write my command ? Thanks in advance for your help. Cyrille Barn??rias Adjoint au chef d'??chelon interr??gional de Caen Inventaire forestier national 73 rue Marie Curie 14 200 H??rouville Saint-Clair France Tel : 02.31.47.71.53