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In this paper we used an expected cost model for a process whose mean is controlled by X(bar) chart and whose variance is controlled by an R chart in the Textile Industry Oeste Ltda. in the State of Santa Catarina. The expected cost comprises the fixed and variable costs of sampling, the cost of investigating and correcting the process when at least one control chart indicates that the process parameters...
Currently considerable attention has been given to the effect of data correlation on statistical process control (SPC). Use of traditional SPC methods when observations are correlated often leads to misleading conclusions as to whether or not the process is under control. The objective of this paper is to develop an algorithm to adjust a model ARMA(p,q), for calculate the run length distribution (RLD),...
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