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Statistical process control in nursing research.
Denise F Polit1, Wendy Chaboyer
1Humanalysis, Inc., 75 Clinton Street, Saratoga Springs, NY 12866; Griffith University School of Nursing, Gold Coast, Australia.
Research in Nursing & Health
|November 19, 2011
Summary
Statistical Process Control (SPC) offers a robust method for analyzing intervention effects in time series data, overcoming challenges in quasi-experimental research. This approach helps distinguish normal variation from significant changes, aiding in the evaluation of innovations like nursing practice improvements.
Area of Science:
- Nursing
- Health Services Research
- Biostatistics
Background:
- Quasi-experimental designs are common when randomization is not feasible in intervention studies.
- Time series designs offer strong quasi-experimental evidence but face technical and analytic challenges.
- Statistical Process Control (SPC) presents an alternative analytic method for time series intervention data.
Purpose of the Study:
- To provide an overview of Statistical Process Control (SPC).
- To illustrate the application of SPC in evaluating a nursing practice improvement intervention.
- To highlight SPC as a tool for analyzing variation in time series data.
Main Methods:
- Utilized control charts to differentiate common cause variation from special cause variation.
- Applied SPC methodology to analyze data from a nursing practice improvement study.
- Employed time series analysis principles within the SPC framework.
Main Results:
- Demonstrated SPC's capacity to identify statistically significant changes resulting from interventions.
- Illustrated how SPC distinguishes random fluctuations from intervention-induced effects.
- Showcased the practical utility of SPC in a real-world nursing context.
Conclusions:
- Statistical Process Control (SPC) is a viable and powerful analytic approach for quasi-experimental time series research.
- SPC facilitates the interpretation of intervention effects by analyzing variation.
- The study supports the adoption of SPC for evaluating healthcare innovations and practice changes.
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