Isnaini Mahuda
Universitas Sultan Ageng Tirtayasa

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Analysis of Gojek Service User Segmentation Among FT UNTIRTA Students Using the RFM Method Dinda Dwi Anugrah Pertiwi; Regina Dwirahma Alisya; Andhika Muhamad Ichsan; Faula Arina; Isnaini Mahuda
Theta: Journal of Statistics Vol 2, No 1 (2026): Available Online in March 2026
Publisher : Faculty of Engineering, Univesitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/tjs.v2i1.39312

Abstract

The development of transportation and application-based services highlights the importance of user behavior analysis as a basis for data-driven marketing strategies. This study analyzes the segmentation of GOJEK service users (GoRide, GoCar, and GoFood) among students of the Faculty of Engineering, Sultan Ageng Tirtayasa University (FT UNTIRTA) using the Recency, Frequency, and Monetary (RFM) approach. Primary data were collected through questionnaires distributed to 105 active GOJEK users using purposive sampling. Data were analyzed through pre-processing, standardization, determination of the optimal number of clusters using the Elbow method, and clustering using the K-Medoids algorithm, which was selected over K-Means and K-Median due to its robustness against outliers, suitability for non-normally distributed RFM data, and use of actual data points as cluster centers for more interpretable segmentation results. The results showed that the optimal number of clusters for each service was three, classified as loyal, active, and passive customers. In GoRide, the distribution was 15 loyal, 32 active, and 16 passive users; in GoCar, 16 loyal, 10 active, and 35 passive users; and in GoFood, 25 loyal, 1 active, and 52 passive users. Loyal clusters are characterized by low recency and high frequency and monetary values, active clusters show medium usage rates, and passive clusters exhibit low frequency and transaction values. These results demonstrate that the RFM and K-Medoids combination is effective in identifying behavioral differences among GOJEK users, as validated by the Silhouette Score and Davies-Bouldin Index confirming cluster compactness and separation quality, and can serve as a basis for formulating more targeted marketing strategies in the student environment.
Application of the TARCH Model for Stock Price Prediction: Evidence from PT Bank Rakyat Indonesia (BRI) Tbk Putri Dina Sari; Faula Arina; Aulia Ikhsan; Isnaini Mahuda; Syarif Abdullah; Patricia Pingkan Kumenap; Regina Dwirahma Alisya
Theta: Journal of Statistics Vol 1, No 2 (2025): Available Online in September 2025
Publisher : Faculty of Engineering, Univesitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/tjs.v1i2.35930

Abstract

Stock price volatility is a crucial aspect in capital market analysis because it can influence investment decisions. The GARCH model is commonly used to model volatility, but this model assumes that positive and negative shocks affect volatility symmetrically. In practice, particularly in banking stocks, asymmetric effects are often observed, with negative shocks having a greater impact on volatility than positive shocks. To address this issue, this study uses the Threshold ARCH (TARCH) model, which is capable of capturing asymmetric effects. The research data consists of the daily closing prices of PT Bank Rakyat Indonesia (BRI) Tbk shares from January 2, 2015, to September 12, 2025. The results show that the TARCH model is more appropriate than the symmetric GARCH model, as the asymmetry coefficient is significant, indicating the presence of leverage in BRI shares. Therefore, the TARCH model can be used to forecast BRI stock volatility and provide more accurate information for investors and analysts in anticipating market risks.