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Original Message (ID '121622') By Peter Pein:
Hi, tell Mathematica that the parameters are positive: FindFit[data,{((1-((Log[(1+(xX1/RMSX1))])/(Log[(1+((10^6)/RMSX1))])))*(1/(Log[(Exp[1]+((xX1/aX1)^nX1))]))^mX1),And@@Thread[{RMSX1,aX1,nX1,mX1}>0]},{RMSX1,aX1,nX1,mX1},{xX1}] {RMSX1->84.1591,aX1->30.279,nX1->4.97656,mX1->0.485415} hth, Peter