... incomplete gamma function gammq in§6 .2. In particular, equation (6 .2. 18) gives the probability Q that the chi-squareshould exceed a particular value χ 2 by chance, where ν = N − M is the number ... logarithm,namely,Ni=1[yi− y(xi)] 2 2σ 2 − N log ∆y (15.1.4)Since N, σ,and∆yare all constants, minimizing this equation is equivalent tominimizing (15.1 .2) .What we see is that least-squares ... IN C: THE ART OF SCIENTIFIC COMPUTING (ISBN 0- 521 -43108-5)Copyright (C) 1988-19 92 by Cambridge University Press.Programs Copyright (C) 1988-19 92 by Numerical Recipes Software. Permission is...