ABSTRACT Life as a student living away from home brings academic experiences into a new social environment, making the ability to manage oneself and interact with others part of everyday life. Within this context, the study describes assertive behavior and psychological well-being while also examining the relationship or contribution of assertive behavior to psychological well-being among students living away from home in Banjarmasin. A quantitative approach with a correlational design was employed with 110 students living away from home who were selected through purposive sampling. Data were collected using the psychological well-being short scale and an assertive behavior scale, each consisting of 18 items with four response options. The analysis was conducted using simple linear regression with the assistance of JASP. The results revealed a positive and significant predictive relationship between assertive behavior and psychological well-being, with R = 0.504, R² = 0.254, and p < 0.001. The value of R² indicates that assertive behavior contributed 25.4% to the variation in psychological well-being, while the remaining 74.6% was not explained by the model. These findings position assertive behavior as one personal resource associated with the psychological well-being of students living away from home, while also indicating that this condition is shaped by factors beyond the variables examined, which contribute to students’ experiences of adaptation, social relationships, and functioning. ABSTRAK Kehidupan sebagai mahasiswa perantau membawa pengalaman akademik ke dalam lingkungan sosial yang baru, sehingga kemampuan mengelola diri dan berinteraksi menjadi bagian dari keseharian. Dalam konteks tersebut, penelitian ini menggambarkan perilaku asertif dan psychological well-being sekaligus menguji hubungan atau kontribusi perilaku asertif terhadap psychological well-being mahasiswa perantau di Kota Banjarmasin. Pendekatan kuantitatif dengan desain korelasional digunakan pada 110 mahasiswa perantau yang dipilih melalui purposive sampling. Data diperoleh melalui psychological well-being short scale dan skala perilaku asertif, masing-masing terdiri atas 18 item dengan empat pilihan respons. Pengujian dilakukan menggunakan regresi linear sederhana dengan bantuan JASP. Hasil analisis memperlihatkan hubungan prediktif yang positif dan signifikan antara perilaku asertif dan psychological well-being, dengan R = 0,504, R² = 0,254, dan p < 0,001. Nilai tersebut menunjukkan bahwa perilaku asertif memberikan kontribusi sebesar 25,4% terhadap variasi psychological well-being, sementara 74,6% lainnya belum terjelaskan dalam model. Temuan ini menempatkan perilaku asertif sebagai salah satu sumber daya personal yang berkaitan dengan kesejahteraan psikologis mahasiswa perantau, sekaligus menegaskan bahwa kondisi tersebut terbentuk melalui faktor lain di luar variabel yang dikaji, yang turut membentuk pengalaman adaptasi, relasi sosial, dan keberfungsian mahasiswa.
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