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There is now a CONTENT FREEZE for Mercury while we switch to a new platform. It began on Friday, March 10 at 6pm and will end on Wednesday, March 15 at noon. No new content can be created during this time, but all material in the system as of the beginning of the freeze will be migrated to the new platform, including users and groups. Functionally the new site is identical to the old one. webteam@gatech.edu
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A preliminary Cusum chart based on individual observations is developed from
the uniformly most powerful test for the detection of linear trends. This
Cusum chart is compared with several of its alternatives which are based on
the likelihood ratio test and on transformations of standardized recursive
residuals on which for instance the Q-chart methodology is based. It turns
out that the proposed Cusum chart is not only superior in the detection of
linear trend out-of-control conditions, but also in the detection of other
out-of-control situations considered in this paper. Approximate control
limits, determined from simulation, and an example of its use in practice
are given for the proposed Cusum chart. (Joint work with Ronald Does,
University of Amsterdam).
