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I I remember correctly Settefield collated all historical estimations for C regardless of their age experimental methodology or accuracy of error bands. He then, almost without exception, took the upper limits of the error bands and some very old and wildly wrong guesstimates and produced a curve that suggested an exponential fall off from roughly 7 days after creation (where C remains suspiciously constant) to a steady flat state round about the time C started being measured by atomic clocks. How convenient it is that C reached a steady state round about the time we developed the tech to accurately measure it.
Basically it was the typical creationist's game of taking spurious data and bending it till it gives the desired result.
Setterfield was selective in the data which he used, he did not account for error bars when fitting his curve, and he had no physical motivation for the unusual functional form that he chose.
FYI, Setterfield's claim that the speed of light has changed was debunked long ago by Aardsma, another young-earth Creationist:
Has the Speed of Light Decayed?
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