[Control charts--a useful graphical tool for the analysis of process variation over time].

@article{Andersen2009ControlCU,
  title={[Control charts--a useful graphical tool for the analysis of process variation over time].},
  author={S. E. Andersen and Johan Kjaergaard},
  journal={Ugeskrift for laeger},
  year={2009},
  volume={171 11},
  pages={895-8}
}
Most hospital work can be seen as linked processes. Designed to examine process performance, control charts allow distinction between two types of variation. While processes that exhibit special cause variation are unstable and should be improved by eliminating special causes, processes exhibiting only common cause variation are predictable and should be… CONTINUE READING