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66 PCB007 MAGAZINE I SEPTEMBER 2025 comprehensive curve-fitting software system for Windows. A toolbox of over 35 built-in models can model XY data, including: Interpolation (spine) Linear regression models • Linear, quadratic, and polynomials to the 16th order Nonlinear regression models • Exponential, modified exponential, logarithmic, reciprocal logarithm, vapor pressure, power, modified power, shifted power, geometric, modified geometric, root, Hoerl, modified Hoerl, reciprocal, reciprocal quadratic, Bleas- dale, Harris, exponential association, satura- tion growth, Gompertz, logistic, Richards, MMF, Weibull, sinusoidal, Gaussian, hyper- bolic, heat capacity, and rational function H A P PY 'S T EC H TA L K # 4 3 Figure 3 shows the model used to simulate the PCB first-pass yield (FPY) 2 . You can also build custom regression models with the 15 additional models provided: Bacon, Watts, Bent Hyperbola, BET, Beta distri- bution, Cauchy, Chapman-Richards, Freundlich, Gamma, generalized hyperbola, Gunary, inverse, Langmuir, log normal, Lorentz equation, sum of exponentials, truncated Fourier series, and the two-parameter bell. Moreover, you can compare the fit of various models, or let the software pick the best for you. You can download it from several websites featuring shareware software. Summary Per the SixSigma tutorial 3 , "Always keep in mind that Engineering Statistics (ES) should be purpose- driven. Be clear on the organization's vision for the future and stay focused on it. ES can be a powerful F i g u re 3 : C u r ve E x p e r t s c re e n s : a ) X Y d at a i n p u t w i t h ra n k i n g of t h e to p 27 m o d e l s to t h e X Y d at a ; b) G ra p h of t h e X Y d at a w i t h t h e f i t te d m o d e l d i s p l aye d i n c ; c) S e l e cte d m o d e l i nfo r m at i o n of c o ef f i c i e nt s , h i sto r y, c ova r i a n c e, re s i d u a l s , a n d c o m m e nt s . a. b. c. ▼