Thursday, November 1, 2007

Shewhart's PDSA Cycle

[to be continued ...]

W. A Shewart vs the frequentist theory of probability

There is a thesis that "Keynes wrote A Treatise on Probability in opposition to the frequentist theory of probability" in an Oxford Journals article.

Prediction and pragmatism in Shewhart’s theory of statistical control

Author(s): Mark Wilcox
Journal: Management Decision
ISSN: 0025-1747
Year: 2004 Volume: 42 Issue: 1 Page: 152 - 165
DOI: 10.1108/00251740310495090
Publisher: Emerald Group Publishing Limited
Abstract: Dr W.A. Shewhart, “founder” of the modern quality movement and inventor of the control chart, was greatly influenced by the pragmatist philosopher, C.I. Lewis. However, Lewis's influence is less clear. Shewhart did not refer to Lewis in his 1931 book and it was not until the 1939 publication of his lectures that we find references to Lewis. While Shewhart's work has been read and understood by statisticians, this paper argues that to fully understand his work, one needs a background in philosophy of science. To make the point, this paper uncovers similarities between Lewis's pragmatism and Shewhart's invention of the control chart. Not least is a theory of prediction. The paper concludes that Shewhart had formed the core of his theory before reading Lewis, and that Mind and the World Order (Lewis, C.I., Mind and the World Order: Outline of a Theory of Knowledge, Dover Publications, New York, NY, 1929) provided a convenient post hoc rationalisation. The basis for a theory of management by prediction is a significant outcome of this paper.