Sains Malaysiana 30: 87-106 (2001) Pengajian Kuantitatif/ Quantitative Studies
A Modified Nonparametric Univariate Control Chart for Location Based on the Trimmed Mean
Moustafa O, Abu-Shawiesh Department of Staistics College of Management Sciences and Planning King Faisal University, P.O. Box 1760 Al-Ahsa 31982, Kingdom of Arab Saudi
Mokhtar B. Abdullah School of Mathematical Sciences Faculty Science and Technology Universiti Kebangsaan Malaysia 43600 UKM Bangi Selangor D.E. Malaysia
ABSTRAK
Rencana ini mengemukakan ubahsuaian kepada had kawalan dan garis tengah Carta Kawalan Hodges-Lehmann yang dicadangkan oleh Alloway dan Raghavachari (1991). Ubahsuaian ini dilakukan dengan menggantikan median purata Walsh dengan min terpangkas-a
ABSTRACT
This paper develops a modified approach to the computation of control limits and central line for the Hodges-Lehmann control chart proposed by Alloway & Raghavachari (1991). The modified approach is based on replacing the median of the Walsh averages by the a-trimmed mean,
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dalam penganggar Hodges-Lehmann. Contoh berangka ditunjukkan bagi menerangkan kaedah baru ini. Prestasinya dibandingkan dengan prestasi kaedah Alloway & Raghavachari (1991) menerusi kajian simulasi.
