How Do You Interpret Control Chart Results

As we mentioned earlier, you can interpret your control chart results using the same approach used for run charts except that now you have another way to identify possible special cause signals in your data. You will know you have a likely special cause signal when one or more points fall outside the upper or lower control limits.

Figures 22.13, 22.14, and 22.15 illustrate special cause signals occurring in control charts.

FIGURE 22.13. SPECIAL CAUSE SIGNAL: EIGHT CONSECUTIVE POINTS ON SAME SIDE OF CENTER LINE.

FIGURE 22.13. SPECIAL CAUSE SIGNAL: EIGHT CONSECUTIVE POINTS ON SAME SIDE OF CENTER LINE.

(Limits based on readings prior to medication change.)

(Limits based on readings prior to medication change.)

FIGURE 22.14. SPECIAL CAUSE SIGNAL: SIX CONSECUTIVE POINTS TRENDING IN THE SAME DIRECTION (UPWARD IN THIS CASE).

FIGURE 22.14. SPECIAL CAUSE SIGNAL: SIX CONSECUTIVE POINTS TRENDING IN THE SAME DIRECTION (UPWARD IN THIS CASE).

Day

FIGURE 22.15. SPECIAL CAUSE SIGNAL: A POINT OUTSIDE A CONTROL LIMIT.

Medicatior

increased

- , . . .

15 17 Day

19 21 23 25 27 29 31

11 13

15 17 Day

19 21 23 25 27 29 31

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