{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,4]],"date-time":"2026-05-04T13:38:03Z","timestamp":1777901883825,"version":"3.51.4"},"reference-count":23,"publisher":"SAGE Publications","issue":"3","license":[{"start":{"date-parts":[[1997,3,1]],"date-time":"1997-03-01T00:00:00Z","timestamp":857174400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["SIMULATION"],"published-print":{"date-parts":[[1997,3]]},"abstract":"<jats:p>This article describes a simulation to compare the effectiveness of Variable Sampling Intervals (VSI) with Fixed Sampling Intervals (FSI). This comparison is made using both techniques in conjunction with Shewhart X-bar charts and data that are unknowingly positively autocorrelated. Simulation was essential to providing these research results because to date no theoretical solution addresses the performance of the VSI Shewhart X-bar chart when the data are autocorrelated. Control limits, calculated from initial sample observations, are utilized. The use of VSI is found to cause a quicker time to signal for an out of control process. We conclude that while the use of variable sampling intervals is advantageous when a large shift in the mean is expected, the VSI procedure is more sensitive to the impact of autocorrelation.<\/jats:p>","DOI":"10.1177\/003754979706800303","type":"journal-article","created":{"date-parts":[[2007,3,18]],"date-time":"2007-03-18T03:46:49Z","timestamp":1174189609000},"page":"164-174","source":"Crossref","is-referenced-by-count":0,"title":["A Simulation Study for Comparing Fixed with Variable Sampling Interval Shewhart X-Bar Control Charts in the Presence of Undetected Autocorrelated Data"],"prefix":"10.1177","volume":"68","author":[{"given":"Howard R.","family":"Clayton","sequence":"first","affiliation":[{"name":"University of North Texas Business Computer Information Systems Department Denton, TX"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Martha M.","family":"Harvey","sequence":"additional","affiliation":[{"name":"Midwestern State University Division of Business Administration Wichita Falls, TX"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Victor R.","family":"Prybutok","sequence":"additional","affiliation":[{"name":"University of North Texas Business Computer Information Systems Department Denton, TX"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[1997,3,1]]},"reference":[{"key":"atypb1","first-page":"30","author":"Saniga, Erwin M.","year":"1977","journal-title":"Quality Progress"},{"key":"atypb2","first-page":"58","author":"Modarress, B.","year":"1989","journal-title":"Production and Inventory Management Journal Second Quarter"},{"key":"atypb3","volume-title":"Statistical Quality Control","author":"Grant, E.L.","year":"1988","edition":"6"},{"key":"atypb4","volume-title":"Introduction to Statistical Quality Control","author":"Montgomery, D.C.","year":"1991","edition":"2"},{"key":"atypb5","first-page":"181","volume":"30","author":"Reynolds, 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