A paper by R.N. Rodriguez (Health Care Applications of Statistical Process Control: Examples Using the SAS® System,

A paper by R.N. Rodriguez (€œHealth Care Applications of Statistical Process Control: Examples Using the SAS® System,€ SAS Users Group International: Proceedings of the 21st Annual Conference, 1996) illustrated several informative applications of control charts to the health care environment. One of these showed how a control chart was employed to analyze the rate of CAT scans performed each month at a clinic. The data used in this example are shown in Table 7E.21. NSCANB is the number of CAT scans performed each month and MMSB is the number of members enrolled in the health care plan each month, in units of member months. DAYS is the number of days in each month. The variable NYRSB converts MMSB to units of thousand members per year, and is computed as follows: NYRSB = MMSB (Days/30)/12000. NYRSB represents the €œarea of opportunity.€ Construct an appropriate control chart to monitor the rate at which CAT scans are performed at this clinic.

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TABLE 7E.21 Data fer Exercise 7.79 MonthNSCANB MMSB Days NYRSB lan 94 Fch. 9426,903 Mach 94 71 Apt. 94 May 94 un 94 4,185 3 2.18208 July 94 4 Aug, 94 57 2,092 3 224681 Sept. 94 4925,958 32.16317 Oct 94 6325957 3 2.23519 Nov. 4 Dec. 94 25,838 2.31105 25,895 3 .3596 20,289 2.19075 20,149 2.25172 26142 31 22512 25 020 2.16000 62 25,907 31 223088 25,7543 2.30382 25,696 28 2.07636 2536วิ 31 228754 Fc. 95 March 9 89