Abstract
It is vital to choose the right supplier to reduce cost and provide high-quality products. However, a gap remains because the supplier’s process is mainly measured using qualitative and intangible criteria. Further, with technological advances, the measurement of quality characteristics is transforming through smart data sensors. With a specific time or space measurements can be done at high frequency. The functional relationships between the measures or profiles can be established. The profiles indicate the pattern in the data. The literature focused on the case when quality characteristics are described by linear profile and consider symmetric tolerance. However, in a real-world application, nonlinear profiles and asymmetric tolerance is frequently found. This study proposed multiple comparisons with the best and the difference test statistic methods to select the best suppliers when the quality characteristics are described by nonlinear profile with asymmetric tolerances. A Monte Carlo simulation study is conducted, computer programs are written in the R programming language. The result indicated in terms of rejecting inferior suppliers, the multiple comparisons with the best method perform better than the difference test statistics. With the proposed methods, managers can make decisions using a single, easy-to-understand index. Also, these methods can handle any number of suppliers. For the convenience of a decision-maker, critical values, and profile size requirements are provided. An illustrative example is included to give a better insight into the proposed methods.
Highlights
The global business situation is aggressively competitive; it requires companies to manufacture ‘‘defect-free’’ products [1]
A gap remains because the quality is mainly measured using qualitative and intangible criteria
For linear profiles with one-sided specifications, the multiple comparisons with the best (MCB) method based on process capability indices (PCIs) is provided by [47] to compare the process yields of multiple suppliers
Summary
The global business situation is aggressively competitive; it requires companies to manufacture ‘‘defect-free’’ (zero defect) products [1]. Quality is the decisive criteria for evaluating supplier’s performances and supplier selection [6]. The literature is lacking to study supplier selection for nonlinear profiles [24]. The study of supplier evaluation and selection for the nonlinear profile with asymmetric tolerance is needed. This study proposed multiple comparisons with the best (MCB) and difference statistics with Bonferroni correction methods. A Monte Carlo simulation study with 100,000 replications is conducted to determine the critical values, selection power, and required number of profiles for the proposed methods.
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