R Computer Program for The S2 Control Chart

To monitor the process variability, the s chart is frequently used. However, the center line of this chart is not an unbiased estimator of the process standard deviation. To avoid this problem, the s2 chart may be used instead of the s chart because its center line is an unbiased estimator for the process variance. The paper presents the conceiving of a computer program for the s2 chart. The program is developed by means of the R language. After presenting the way in which the program was developed, the paper presents the results obtained after running it.