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class 24 supplement

# class 24 supplement - HJudgment based only on facts may be...

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Click to edit Master subtitle style HA 4315:  Class 24 Course Objectives: 1. Describe two methods used to identify common/special cause variation within a data set. 2. Explain common/special cause variation, as identified by a Run Chart with the Mean shown. 3. Compute probability statistics using the Normal Distribution and z-score to identify common/special cause variation. 4. Apply these process variation evaluation techniques to practical examples in healthcare administration. “Judgment based only on facts may be viewing the future through a rear view window.” - Ray E. Brown, Healthcare Administrator and Professor

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Special vs. Common Cause Variation n Review of definitions q Common (Chance) Cause Variation q Special (Assignable) Cause Variation n Methods to determine if change in the process is occurring by chance vs. management’s QI implementations: q Run Chart with the Mean. q Normal Distributions and the z-score.
Run Chart with the Mean n Example: data regarding accidents per month. n Management had previously requested a 25% accident decrease in 2007. n There was a 29% decrease in accidents from 2007 to 2008. n Is this QI?

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Run Chart with the Mean (con’t) n Same data in a Run Chart (no mean):
Run Chart with the Mean (con’t) n Same data, Run Chart with the Mean Identify Special Cause Variation: 9 or more consecutive points on one side of the mean. 7 consecutive points either increasing or decreasing. 14 consecutive points that alternate up and down. From: Coach’s Guide to the Memory Jogger. Question: is Special Cause Variation present in this process?

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Run Chart with the Mean (con’t) n No special causes are present in the process from 2007 to 2008. n Any QI attempts by the management were unsuccessful. q 29% accident decrease was due to chance (common cause variation). q 1/3 of the time this process variation may occur simply by chance alone. n Management can now use this data (and the calculated process mean) to create QI methods to lower the mean in the future.
n A second method exists to determine if process change is due to special or common cause variation within the system. n

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class 24 supplement - HJudgment based only on facts may be...

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