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EMPLOYEE VOLUNTARY ATTRITION PREDICTION AT PT.XYZ: ENSEMBLE MACHINE LEARNING APPROACH WITH SOFT VOTING CLASSIFIER Bey Lirna, Cagiva Chaedar; Trimono, Trimono; Damaliana, Aviolla Terza
Jurnal Teknik Informatika (Jutif) Vol. 5 No. 5 (2024): JUTIF Volume 5, Number 5, Oktober 2024
Publisher : Informatika, Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52436/1.jutif.2024.5.5.2007

Abstract

This research addresses the complexity of employee attrition challenges at PT.XYZ. The main objective is to develop a predictive system for potential voluntary employee attrition by focusing on an in-depth analysis of the factors contributing to attrition at PT.XYZ. The research utilizes data containing information on the job history of PT.XYZ employees from 2018 to 2023. The method employed in the research is a soft voting ensemble classifier model, incorporating SVM, decision tree, and logistic regression, supported by relevant literature. Analysis and exploration of historical data of PT.XYZ employees are conducted to identify key factors influencing employees' decisions to leave the company. Careful data preprocessing is carried out to ensure dataset quality before applying it to the soft voting classifier model. The results of the soft voting classifier modeling used in this research achieve excellent accuracy in both training and testing datasets with respective accuracy percentages of 99% and 98%. Based on the final results of applying the soft voting classifier model, it is expected to provide deep insights and solutions to enhance employee retention at PT.XYZ.
Predicting Price and Risk ICBP Stocks Using GRU and VaR Ryan Dana, Alvin; Trimono, Trimono; Idhom, Mohammad
IJCCS (Indonesian Journal of Computing and Cybernetics Systems) Vol 19, No 1 (2025): January
Publisher : IndoCEISS in colaboration with Universitas Gadjah Mada, Indonesia.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijccs.101974

Abstract

The economy plays a vital role in maintaining a country’s stability and progress, where stock investments serve as a primary financial instrument to enhance societal welfare. In Indonesia, interest in stock investments, especially in the essential food sector, continues to grow due to its long-term profit potential. This study combines stock price prediction with risk analysis using a Gated Recurrent Unit (GRU) model and Value at Risk (VaR) calculation based on historical simulation. The GRU model is selected for stock price prediction due to its ability to capture complex, fluctuating patterns and adapt to market changes, while VaR is used to measure potential maximum loss at a 95% confidence level. The findings indicate a potential loss of IDR 65.785, demonstrating that this approach can provide a risk estimate by combining future predicted prices with historical data. Thus, this approach offers guidance for investors in understanding potential profits and risks in stock assets. The integration of GRU-based predictions and historical simulation VaR is expected to support more informative and prudent investment decision-making, particularly in facing the dynamic and risky stock market conditions.
Analisis Sentimen Penggunaan Galon BPA Menggunakan Seleksi Fitur Chi-Square Dan Algoritma Support Vector Machine Aurelia, Cenditya Ayu; Trimono, Trimono; Mas Diyasa, I Gede Susrama Susrama
Jurnal Ilmiah Teknologi Informasi Asia Vol 18 No 2 (2024): Volume 18 nomor 2 2024 (8)
Publisher : LP2M Institut Teknologi dan Bisnis ASIA Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Air Minum Dalam Kemasan (AMDK) menjadi elemen utama bagi keseimbangan tubuh. Adanya berita tentang bahaya galon yang mengandung BPA menimbulkan kekhawatiran di masyarakat terutama di platform media sosial Twitter sehingga menimbulkan keresahan masyarakat terhadap dampak negatif yang disebabkan dari penggunaan galon BPA. Hal tersebut menciptakan perdebatan antara dua pihak yang terdiri dari masyarakat yang mendukung penggunaan galon BPA dan masyarakat yang mendukung penggunaan galon non-BPA dari produk air minum tertentu. Penelitian ini melakukan analisis sentimen untuk mengelompokkan pendapat masyarakat terkait penggunaan galon menggunakan algoritma Support Vector Machine dan seleksi fitur Chi-Square. Hasil dari penelitian menunjukkan bahwa penerapan seleksi fitur Chi-Square meningkatkan akurasi hingga 0.95 pada kernel Linear dan RBF dengan 239 prediksi yang tepat dan 13 prediksi yang tidak tepat
ANALISIS FAKTOR EKSTERNAL YANG MEMPENGARUHI FREKUENSI PEMBELIAN PADA APLIKASI SHOPEE MENGGUNAKAN REGRESI DUMMY Rhomaningtias, Lina; Khairunisa, Adenda; Trimono, Trimono
JATI (Jurnal Mahasiswa Teknik Informatika) Vol. 9 No. 2 (2025): JATI Vol. 9 No. 2
Publisher : Institut Teknologi Nasional Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/jati.v9i2.12735

Abstract

Penelitian ini bertujuan untuk menganalisis pengaruh faktor-faktor eksternal seperti diskon, harga, kemudahan akses, iklan, dan rating terhadap frekuensi pembelian pada aplikasi e-commerce Shopee. Faktor-faktor ini dipilih karena merupakan aspek yang sering dipertimbangkan oleh konsumen dalam membuat keputusan pembelian di platform e-commerce. Penelitian ini menggunakan desain kuantitatif dengan pendekatan regresi dummy pada data yang dikumpulkan melalui kuesioner daring dari 63 responden. Pendekatan regresi dummy dipilih karena memungkinkan peneliti untuk menganalisis pengaruh variabel kategorik terhadap variabel dependen numerik. Hasil analisis menunjukkan bahwa diskon, kemudahan akses, iklan, dan rating memiliki pengaruh positif dan signifikan terhadap frekuensi pembelian, sementara harga memiliki pengaruh negatif yang signifikan. Model regresi yang digunakan mampu menjelaskan 76,8% variasi dalam frekuensi pembelian, sementara 23,2% sisanya dapat dijelaskan oleh faktor lain yang tidak dianalisis dalam penelitian ini. Penelitian ini memberikan kontribusi penting bagi pemilik platform e-commerce dalam merancang strategi pemasaran yang lebih efektif, serta memberikan wawasan bagi konsumen dalam memanfaatkan promosi dan memilih produk dengan harga kompetitif.
Prediction of Purchase Volume Coffee Shops in Surabaya Using Catboost with Leave-One-Out Cross Validation Nariyana, Calvien Danny; Idhom, Mohammad; Trimono, Trimono
Jurnal Ilmiah Teknik Elektro Komputer dan Informatika Vol. 11 No. 1 (2025): March
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/jiteki.v11i1.30610

Abstract

Indonesia's coffee consumption grew from 265,000 tons in 2015 to 294,000 tons in 2020. Averaging 2% annual growth with a projected 368,000 tons by 2024. One of the coffee businesses is coffee shops, Coffee shop businesses often struggle to attract customers quickly, risking low purchase volume within their first five years. In their first year, challenges include management, company size, service quality, and customer preferences.  This study adopts a quantitative approach and new solutions to develop a purchase prediction application based on machine learning and strategy to enhance purchase volumes for three coffee shops in Surabaya. It utilizes CatBoost, with LightGBM as a comparison, across multiple coffee shop locations. LOOCV (Leave-One-Out Cross-Validation) is used in this model to address research limitations, such as data overfitting and biases, while enhancing evaluation accuracy. As a result, the study established CatBoost as the superior model for purchase prediction, providing insights and practical applications in business forecasting. The Catboost model achieved an MAE of 0.91 and MAPE of 15%, outperforming LightGBM’s MAE of 1.13 and MAPE of 18%. These results confirmed CatBoost’s effectiveness for the coffee shop industry with good accuracy. This research also contributes to helping coffee shop owners in Surabaya understand market characteristics, such as the most profitable coffee types and high-customer-density locations. Additionally, it aids in optimizing purchase volume to leverage profit by developing new strategies based on prediction result.  In conclusion, CatBoost accurately predicts purchase volume, helping coffee shops identify target markets and refine strategies based on customer preferences.
PREDIKSI PERMINTAAN DARAH DI UTD KOTA SURABAYA MENGGUNAKAN METODE HYBRID ARIMA-ANFIS Oktaviani, Sheny Eka; Trimono, Trimono; Damaliana, Aviolla Terza
Jurnal Lebesgue : Jurnal Ilmiah Pendidikan Matematika, Matematika dan Statistika Vol. 6 No. 1 (2025): Jurnal Lebesgue : Jurnal Ilmiah Pendidikan Matematika, Matematika dan Statistik
Publisher : LPPM Universitas Bina Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46306/lb.v6i1.938

Abstract

Blood supply is a crucial aspect for UTD which must meet the demand for blood for those who need it. UTD Surabaya City faces challenges in meeting blood needs caused by the uncertainty of blood demand which varies and is individualized according to the recipient's clinical condition which has an impact on the quality of UTD Surabaya City services, thus creating challenges in meeting blood needs optimally. Therefore, it is necessary to predict blood demand to assist UTD Surabaya City in ensuring adequate blood stock, planning the blood stock needs that will be requested, and avoiding stock overstocks and stock shortages. To overcome this, blood demand is predicted using the Autogressive Moving Average (ARIMA) and Adaptive Neuro Fuzzy Inference System (ANFIS) approaches. This combination of the ARIMA-ANFIS method combines the advantages of ARIMA in capturing linear patterns and ANFIS in handling non-linear patterns from ARIMA residuals. The prediction results from the ANFIS model will be added to the prediction results from the ARIMA model to obtain a hybrid ARIMA-ANFIS model. The ARIMA-ANFIS model is used to predict the number of blood requests by combining ARIMA predictions and residuals modeled using ANFIS. This process includes stationarity analysis, selecting the best ARIMA model, residual modeling with ANFIS, as well as performance evaluation using MAPE to ensure prediction accuracy. The best ARIMA (6,1,0) model was obtained with the lowest AIC value of -153.838, then from the ARIMA modeling results the residuals were obtained as input for ANFIS modeling. Analysis shows that the ARIMA-ANFIS hybrid model has better performance, with a MAPE value of 5.28%, compared to the ARIMA model which only achieved a MAPE of 6.21%.
MODEL VECTOR AUTOREGRESSIVE (VAR) UNTUK PREDIKSI INDEKS HARGA KONSUMEN, HARGA BERAS, DAN INFLASI KOTA SURABAYA Suprapto, Rheinka Elyana; Trimono, Trimono; Aviolla Terza Damaliana
Jurnal Lebesgue : Jurnal Ilmiah Pendidikan Matematika, Matematika dan Statistika Vol. 6 No. 1 (2025): Jurnal Lebesgue : Jurnal Ilmiah Pendidikan Matematika, Matematika dan Statistik
Publisher : LPPM Universitas Bina Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46306/lb.v6i1.965

Abstract

The current global economic conditions face increasingly complex challenges, with projections of economic weakness continuing until 2025. Globalization has reduced the role of domestic factors and strengthened the impact of the global economy on the formation of inflation. From a macroeconomic perspective, the level of economic growth is often used as a leading indicator of a country's success, reflecting continuous changes in the economy with the aim of achieving better conditions over a certain period of time. Historically, the inflation rate in Indonesia tends to be higher compared to other developing countries. Data shows that during the 2010–2020 period, Indonesia's quarterly inflation was consistently higher than other developing countries. This study uses time series data analysis with a multivariate approach that includes three main variables: inflation, rice prices, and the consumer price index (CPI). The method used is Vector Autoregressive (VAR), which is an analysis technique for data with more than one related variable. The results of the analysis show that the VAR method produces a Mean Absolute Percentage Error (MAPE) value of 32.73% for inflation, 6.24% for CPI, and 5.78% for rice prices. These findings indicate that the VAR model has varying levels of accuracy for each variable, with more accurate predictions for CPI and rice prices compared to inflation.
Bakery Industry Training Assistance For Excellent Service Agency (ESA) Training Center Malang Yulistiani, Ratna; Sihananto, Andreas; Kartini, Kartini; Trimono, Trimono
International Journal Of Community Service Vol. 3 No. 1 (2023): February 2023 (Indonesia - Malaysia - Timor Leste)
Publisher : CV. Inara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51601/ijcs.v3i1.171

Abstract

Excellent Service Agency (ESA) is an educational institution for the service and service industry in the city of Malang, which is engaged in training in the hospitality industry, especially in the fields of tourism, hospitality, and selfdevelopment. ESA has difficulties in providing professional HR education in the bakery industry due to a lack of equipment, besides that ESA also lacks insight into food safety to support the quality of bakery products that will be produced, even though safety assurance is one of the determinants of competitiveness in both the domestic and international markets. ESA is also less able to expand its market share because it has not implemented digital marketing. The methods that have been carried out include: 1)Assisting ESA with 5 types of bakery processing equipment for ESA to train more professional human resources in the F&B field; 2). Training on Good Manufacturing Practice (GMP) and Food Sanitation; 3) Training and practice of diversifying bakery and cake processing from wheat flour and composite flour; The results of this activity include increasing understanding and insight for ESA employees and students as well as UPN Veterans East Java students about 1. The Role of Good Manufacturing Practice (GMP) and Food Safety for the Bakery Industry; and 2. Basic Theory and Diversification of Bakery Product from Wheat Flour and Composite Flour.
Customer Transaction Clustering with K-Prototype Algorithm Using Euclidean-Hamming Distance and Elbow Method Kuswardana, Dendy Arizki; Prasetya, Dwi Arman; Trimono, Trimono; Diyasa, I Gede Susrama Mas; Awang, Wan Suryani Wan
International Journal of Advances in Data and Information Systems Vol. 6 No. 2 (2025): August 2025 - International Journal of Advances in Data and Information Systems
Publisher : Indonesian Scientific Journal

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59395/ijadis.v6i2.1381

Abstract

This study aims to cluster customer transactions in a Japanese food stall using the K-Prototype Algorithm with a combination of Euclidean-Hamming Distance and the Elbow method. Facing intense industry competition, this study seeks to understand customer purchasing behavior to increase loyalty and sales. From 9.721 initial entries, 9.705 cleaned and transformed records were analyzed. K-Prototype was chosen because of its ability to handle numeric features (Total Sales, Product Quantity) and categorical features (Payment Method, Order Type, Day Category and Time Category). The combination of Euclidean-Hamming distances was used for distance measurement. The optimal number of clusters was determined using the Elbow method, with the results recommending three clusters as the most optimal number. A Silhouette score of 0.6191 indicates a Good Structure clustering result, effectively identifying three distinct customer grouping: "Loyal Regulars" (49.5%), "Casual Shoppers" (42.3%), and "Premium Shoppers" (8.2%). Statistical validity was also tested using ANOVA and Chi-Square, the results showed significant differences between the clusters in numerical and categorical variables with a p-value <0.0001. The clusters are statistically valid in both numerical and categorical aspects. These insights provide an understanding of customer characteristics and reveal a strategically valuable cluster for targeted marketing.
Prediction Of Loss Risk Investment On The Idx Indonesia: Quantitative Approach With Var And Adj-Es Trimono, Trimono; Fahrudin, Tresna Maulana; Ardiani, Ardia Eva
JURNAL STUDI MANAJEMEN ORGANISASI Vol 22, No 1 (2025)
Publisher : Faculty of Economics and Business | Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jsmo.v22i1.73062

Abstract

Loss is the primary risk associated with any investment. In stock investments, the risk of loss can occur at any time and its magnitude cannot be precisely determined. Improper risk management can negatively impact the investment activities carried out by investors. One way to manage risk effectively and prevent bankruptcy is by estimating the potential future risk. This study aims to predict the risk of loss using the quantitative Value-at-Risk (VaR) model, particularly for stocks listed on IDX Indonesia. VaR has the main advantage of being a simple model that can be applied to various types of financial assets. However, VaR also has a drawback it does not satisfy the subadditivity principle. Therefore, this study also employs the Adjusted-Expected-Shortfall (Adj-ES) model as an improvement to VaR. The VaR and Adj-ES models will be implemented on the stocks AMRT.JK and BBCA.JK. These two stocks are part of the IDX Indonesia 2024 blue chip stocks, with a significant increase in market capitalization. The results show that VaR provides prediction results for the risk of loss in the range of 1.2% - 3.4 for AMRT.JK data, and 1.1 - 3.2% for BBCA.JK data. Referring to the Violation Ratio value, it is known that both VaR and Adj-ES have VR values <1 so it is concluded that the prediction accuracy is very good
Co-Authors Abda Abda Abdullah Abdullah Adam, Cindi Ade Irma Agustian Adiwidyatma, Afdhal Reshanda Aliya Dasa Pramesthi Amanillah, Rahmatul Amri Muhaimin Andreas Nugroho Sihananto Ardiani, Ardia Eva Arif, Farah Yusnaida Arifta, Septia Dini Aurelia, Cenditya Ayu Aviolla Terza Damaliana Aviolla Terza Damaliana Awang, Wan Suryani Wan Azni Aisyah Azzahra, Adelia Ramadhina Bainar Bainar, Bainar Bey Lirna, Cagiva Chaedar Carissa, Savvy Prissy Amellia Damaliana, Aviolla Terza Desy Miftachul Ilmi Arifin Putri Dewi, Ni Luh Ayu Nariswari Di Asih I Maruddani Di Asih I Maruddani Di Asih I Maruddani Diash, Hakam Dzakwan Dinda Putri Arnindi Diyasa, I Gede Susrama Mas Dwi Arman Prasetya Dwi Arman Prasetya Edi Sugiyanto Fahrudin, Tresna Maulana Fairuz Luthfia Winoto Putri, Maretta Faiz, Mochammad Abudrrochman Farkhan Febri Giantara Febriyanti, Alvi Yuana Febyanti, Iin Hadi, Surjo Hadiyan Pradipta, Alvino Hasan Hendri Prabowo Herlina Herlina Hervrizal, Hervrizal I Gede Susrama Mas Diyasa I Gede Susrama Mas Diyasa I Gusti Putu Asto Buditjahjanto Icha Rohmatul Jannah idhom, Mohammad Ikaningtyas, Maharani Ikaningtyas, Maharani Imelda Widya Ningrum Indira Zein Rizqin Insania, Nichlata Irawan, Tanaya Anindita Irma Amanda Putri Kartika Maulida Hindrayani Kartini Kartini Kassim, Anuar bin Mohamed Khairunisa, Adenda Khosyi, Hanun Aufa Nur Kusdani, Kusdani Kuswardana, Dendy Arizki Linggasari, Dienna Eries Lisanthoni, Angela M Zufar Irhab S Putra Maharani Ikaningtyas Maruddani, Di Asih Marwani, Arrum Mas&#039;ad Mas&#039;ad Maulana Pasha, Naufal Ricko Maulidiyyah, Nova Auliyatul Milla Akbarany Baktiar Putri Mohammad Idhom Mohammad Idhom Muhaimin, Amri Muhammad Muharrom Al Haromainy Muhammad Nasrudin Munoto Nabila, Nasywa Azzah Nabilah Selayanti Nafiah, Fajria Ulumin Nariyana, Calvien Danny Nasution, Baktiar Nathania, Vannesa Ningrum, Imelda Widya Ningtiyas, Rona Wulan Novita Anggraini Nugraheni, Setiawati Oktaviani, Sheny Eka Panglima, Talitha Fujisai Prisma Hardi Aji Riyantoko Prismahardi Aji Riyantoko Putra, Andrawana Putri, Irma Amanda Putri, Nabila Rizky Amalia Putri, Nevia Desinta Rafiqah, Lailan Rafli Feandika Nugroho, Muhammad Ratna Yulistiani Renaldi, Sahat Rhomaningtias, Lina Riswanda, Mohammad Nizar Riyantoko, Prismahardi Aji Ryan Dana, Alvin Sabela, Sefilah Naurah Safira Devi, Arsita Safira, Alya Mirza Salma Namira, Alivia Saputra, Wahyu Syaifullah Jauharis Sekar Arum Melati Selly Rizkiyah Sihananto, Andreas Sonhaji, Abdulah Sugiarti, Nova Putri Dwi Suprapto, Rheinka Elyana Susrama Mas Diyasa , I Gede Syamsul Rizal Syukri Syukri Tarno Tarno Taufik, Ikbar Athallah Terza Damaliana, Aviolla Tresna Maulana Fahrudin Utami, Rianti Siswi Utriweni Mukhaiyar Valentina, Tiara Wardah Ariij Adibah Wardah, Salsabila Wibowo, Muhammad Bagas Satrio Widayawati, Eny Widayawati, Eny Widduro, Bagus Widison, Daffin Tanjiro Yuciana Wilandari yuliza, eva Zalfa Assyadida, Azizah