A paper by R.N. Rodriguez (“Health 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 “area of opportunity.” Construct an appropriate control chart to monitor the rate at which CAT scans are performed at this clinic.
Answer to relevant QuestionsReconsider the insurance claim data in Table 7E.1. Set up an np control chart for this data and plot the data from Table 7E.1 on this chart. Compare this to the fraction nonconforming control chart in Exercise 7.3. In Table ...Consider the two processes shown in Table 8E.1 (the sample size n = 5). Specifications are at 100 ± 10. Calculate Cp, Cpk, and Cpm and interpret these ratios. Which process would you prefer to use? A normally distributed process has specifications of LSL = 75 and USL = 85 on the output. A random sample of 25 parts indicates that the process is centered at the middle of the specification band, and the standard deviation ...Consider the piston ring data in Table 6.3. Estimate the process capability assuming that specifications are 74.00 ±0.035 mm. A product is packaged by filling a container completely full. This container is shaped as shown in the figure. The process that produces these containers is examined, and the following information collected on the three ...
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