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Edwin Amenta
Ever since sportswriter Henry Chadwick popularized the box score in the 19th century, baseball fans have had a love affair with statistics. Many can recite records like Joe DiMaggio’s 56-game hitting...
    As soon as we have two or more instruments for measuring the same property the question of equivalence raises its head. This paper provides an operational definition of when two or more instruments are equivalent in practice.  Churchill Eisenhart, Ph.D., while working at the U.S. Bureau...
    In most healthcare settings, workers attend weekly, monthly, or quarterly meetings where performances are reported, analyzed, and compared to goals in an effort to identify trends. Reports often consist of month-to-month comparisons with “thumbs up” and “thumbs down” icons in the margins, as well...
    Within maintenance management, the term MTBF (mean time between failures) is the most important key performance indicator after physical availability. Unlike MTTF (mean time to failure), which relates directly to available equipment time, MTBF also adds up the time spent inside a repair. That is,...
    Managers the world over want to know if things are “in control.” This usually is taken to mean that the process is producing 100-percent conforming product, and to this end an emphasis is placed upon having a good capability or performance index. But a good index by itself does not tell the whole...

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