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L-S 관리도 (L-S Control Chart)
정의
중심선 및 관리한계선
- $$ \mathrm{UCL} = \left( \frac{\overline{L}+\overline{S}}{2} \right) + \left( \frac{1}{2} + 3 \frac{e_{3}}{d_{2}} \right) \overline{R} = \overline{M} + A_{9} \cdot \overline{R} $$
- $$ \mathrm{LCL} = \left( \frac{\overline{L}+\overline{S}}{2} \right) - \left( \frac{1}{2} + 3 \frac{e_{3}}{d_{2}} \right) \overline{R} = \overline{M} - A_{9} \cdot \overline{R} $$