Nahar Mim, Faijun
(2022)
Development Of Variable Sampling Interval Run Sum T Chart And Triple Sampling X ̅ Chart With Estimated Process Parameters.
PhD thesis, Perpustakaan Hamzah Sendut.
Abstract
The Shewhart x ̅ control chart is a useful chart in process monitoring. However,
the Shewhart x ̅ chart’s performance is significantly affected if the process standard
deviation is erroneously estimated. To circumvent this problem, the t chart is
commonly used as an alternative to the Shewhart x ̅ chart. The first and second
objectives of this thesis aim at enhancing the performance of the basic t chart by
proposing the variable sampling interval run sum (VSI RS) t charts for monitoring the
mean of a process from a normal distribution, based on known and estimated process
mean, respectively. The Markov chain technique is used to compute the optimal
parameters for the new charts.
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