# A novel application of the EWMA Wilcoxon signed-rank control chart in the animal feed industry
> Herdiani E.T.

URL kanonis: https://discover.unhas.ac.id/publications/pub_scopus_105006529724
Jurnal / Konferensi: Edelweiss Applied Science and Technology
Tahun terbit: 2025
DOI: https://doi.org/10.55214/25768484.v9i5.7166
ISSN: 25768484
Kuartil SJR: Q4
Citations: 1

## Authors
- Herdiani E.T.

## Abstract
Control charts are essential tools in analysis and decision-making for quality control in production processes. This study aims to develop and evaluate the performance of the Exponentially Weighted Moving Average (EWMA) Wilcoxon Signed-Rank nonparametric control chart in monitoring the fat content of animal feed products, specifically at PT Japfa Comfeed Indonesia Tbk Makassar Unit. This study introduces the EWMA Wilcoxon Signed-Rank method as a nonparametric alternative to address the limitations of the classical EWMA, which relies on the assumption of normal distribution. A comparison was conducted with the EWMA Sign control chart to assess its effectiveness in detecting process anomalies with λ parameter variations of 0.05, 0.3, and 0.8. The results indicate that the EWMA Wilcoxon Signed-Rank control chart demonstrates superior anomaly detection capability compared to the EWMA Sign control chart for all tested λ values. This method is more effective in identifying small changes in the animal feed production process. The conclusion of this study is that the EWMA Wilcoxon Signed-Rank control chart has proven to be a more reliable tool for quality control in the animal feed industry. Implementing this method can enhance accuracy in detecting process deviations, thus helping companies maintain product quality consistency.

## Keywords
- EWMA chart
- Control chart
- Wilcoxon signed-rank test
- Rank (graph theory)
- Chart
- Statistics
- Mathematics
- Shewhart individuals control chart
- Computer science
- Engineering
- Process (computing)
- Combinatorics
- Mann–Whitney U test
- Operating system

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Sumber: Discover Unhas — RIMS Universitas Hasanuddin.
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