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An extract from "A Study of NASA Occupational Injuries and Property Damage …, Weiner Associates, Inc, WAI-TR-76.]2.1, Contract No:NASW-2903, Dec. 1976, 122 pgs.

Two programs entitled, "Autocorrelation" and "Day-Count" were written and used to process data presented in this report. The calculator used was a Texas Instruments SR-52. Listings for these programs, which follow, were prepared on Texas Instrument PPX-52 forms. The programs can be readily rewritten for a Hewlett-Packard HP-67 programmable calculator or for any scientific computer. In the latter instance, the programs or major fractions thereof may exist as library subroutines …

An image of a set of data is formed by autocorrelation. The image, which is also a set of data, is, in general, much smoother than the original set. The autocorrelative technique used is both symmetric and conservative in effect.
The objective of an autocorrelation of a set of data is to ascribe to the set, through the means of an image, attributes of a smooth and continuous function, e.g., maxima, minima, periodicity …

The number of days which have (or will have) transpired between two calendar dates is determined, also the number of those days which were used (or will be used) according to a specified weekly schedule.
Because the rate the Earth revolves around the Sun does not divide evenly and conveniently into the rate the Earth rotates on its axis, given two dates it may be a chore to determine the exact number of days between them. Number of days is, of course, a common measure of many things, e.g., biological processes, production machine life …"

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