Costa, A. F.B.; Machado, M. A.G. - In: Journal of Applied Statistics 38 (2011) 2, pp. 233-245
For the univariate case, the <italic>R</italic> chart and the <italic>S</italic> -super-2 chart are the most common charts used for monitoring the process dispersion. With the usual sample size of 4 and 5, the <italic>R</italic> chart is slightly inferior to the <italic>S</italic> -super-2 chart in terms of efficiency in detecting process shifts. In this...