Not a function: “one to many“. In other words, let’s say you had one x-value that maps to many y-values. For example, — in coordinate notation — (2,1) and (2,10). If the first number (the x-value) repeats,
equation and therefore how they are calculated from the fitting parametersaandbin Excel. This only applies to the Excel version of the USL, where an inversion transformation is necessary because Excel cannot fit a rational function by default. Tools like R and Mathematica do not have this ...