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Fuzzy T2 Hotelling (T_f^2 ) Control Chart Kesumawati, Ayundyah; Mashuri, Mashuri; Irhamah, Irhamah
Eksakta: Jurnal Ilmu-Ilmu MIPA VOLUME 14, ISSUE 1, February 2014
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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Abstract

Statistical Process Control (SPC) is a method used to monitor a process for identifying special causes of variation and necessary to improve the process. One technique commonly used in the SPC is to determine whether the process is stable or not, both the mean and variability. Multivariate control charts are used if necessary to control together two or more related quality characteristics. Sometimes in a process production there is a lack of precision in the calculation, especially if the data used in the form of either data or qualitative attributes. Fuzzy set theory, specifically discusses the development of concepts and techniques related to the sources of uncertainty or imprecision in nature. Control charts are constructed by transforming crisp numbers into fuzzy numbers can be an alternative to obtain representative results of several variables in which there are several quality characteristics. Transformation of some functions, which are used in this study is Fuzzy Median Transformation (FMT). The advantages of FMT is that it can be used for the data in the form of asymmetry. This paper will discuss about the algorithm for  Fuzzy T2  Hotelling control chart and its application to the production data of PT. IGLAS (Persero). From the results of the application of Fuzzy T2  Hotelling control chart got that out of the 5 variables that were analyzed, the dominant variables that lead to out of control is variable bottle molding process
Analisis Kepuasan Pelanggan Terhadap Pelayanan Astra Motor Yogyakarta Bagian H1 Penjualan Unit Sepeda Motor Abdullah, Ahmad Husain; Kesumawati, Ayundyah
STATISTIKA: Forum Teori dan Aplikasi Statistika Vol 18, No 2 (2018)
Publisher : Program Studi Statistika Unisba

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Abstract

Kepuasan pelanggan dapat dijadikan sebagai acuan seberapa mampu perusahaan memenuhi nilaiharapan pelanggan. Pelanggan yang benar-benar setia terhadap produk barang/jasa akan sangatpotensial memperngaruhi perilakunya sehingga dapat memicu repeat order dan juga word-of-mouthadvertisers. Penelitian ini bertujuan untuk mengetahui tingkat kepuasan pelanggan terhadappelayanan Astra Motor Yogyakarta bagian pemasaran H1 (Penjualan). Selain itu juga inginmengetahui apakah terdapat perbedaan yang signifikan antara tiap variabel demografi pelangganterhadap tingkat kepuasan yang diberikan. Total responden yang diamati menggunakan tele surveiyaitu sebanyak 414 pelanggan. Hasil analisis faktor konfirmatori diperoleh keputusan bahwa 5dimensi pelayanan yang terdiri dari tangible, responsiveness, assurance, empathy, dan reliabilitytelah valid untuk mewakili 16 indikator pertanyaan. Menggunakan metode normalisasi min-maksdiperoleh hasil bahwa seluruh responden merasa puas terhadap 5 dimensi kualitas pelayanan.Kemudian hasil pengujian Kruskal Wallis diperoleh keputusan terdapat perbedaan kelompok kota,provinsi, jenis pekerjaan, dan tingkat pendapatan responden dengan tingkat kepuasan yangdiberikan terhadap 5 dimensi kualitas pelayanan Astra Motor Yogyakarta bagian pemasaran H1.