![]() There was no market for something called “software” and certainly nothing called “apps”, an entrant into the market only a few years old. In the early days programs were developed by the researchers and shared. ![]() Even then the computational ability of even the largest IBM machines is laughable by today’s standards. ![]() Indeed, the use of regression analysis was almost non- existent before the middle of the last century and did not really become a widely used tool until perhaps the late 1960’s and early 1970’s. ![]() This section of this chapter is here in recognition that what we are now asking requires much more than a quick calculation of a ratio or a square root.
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