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A side-sensitive synthetic chart combined with an X chart

2014; Taylor & Francis; Volume: 52; Issue: 11 Linguagem: Inglês

10.1080/00207543.2013.879221

1366-588X

Marcela Aparecida Guerreiro Machado, Antônio Fernando Branco Costa,

Advanced Statistical Methods and Models

The synthetic chart combined with an chart (Synthetic- chart) signals when a sample point falls beyond the control limits or when a second point, not far from the first one, falls beyond the warning limits, no matter whether one of them falls above the centreline and the other falls below. The side-sensitive Synthetic- chart (SS Synthetic- chart) does not signal when the points beyond the warning limits are on opposite sides of the centreline. In this article, we show that the performance of the Synthetic- chart improves when it is side-sensitive; depending on the magnitude of the shift, the chart signals 30% faster.