US Patent Number
6718221
Publication Date
4-6-2004
Abstract
The method comprises establishing the number of subsets of a dataset that have a range of the difference between any two datapoints within the dataset, and computing a control chart for the range based thereon. In another aspect, a software program for accomplishing the method of the present invention is provided. The method of the invention allows monitoring variability of a product being produced by a particular piece of machinery, of a process conducted by the machinery, or of a product stream generated thereby, accurately detecting changes in variability in real time. The true distribution of the data is reflected, and the desired result is achieved without requiring an inordinate number of computations.
Assignees
University of Kentucky Research Foundation, Lexington, KY (US)
Application Number
10/442,330
Filing Date
05/21/2003
Recommended Citation
Stromberg, Arnold J., "Nonparametric Control Chart for the Range" (2004). Statistics Faculty Patents. 1.
https://uknowledge.uky.edu/statistics_patents/1
