Fira Dwi Ananda; Assyifa Rahman Hakim; Indra Budiansah; Rien Ritawidya; Deni Hardiansyah. THE EFFECTS OF INTRA-INDIVIDUAL VARIABILITY SETTING ON THE ACCURACY OF TIME-INTEGRATED ACTIVITY CALCULATIONS USING NONLINEAR MIXED-EFFECTS MODELING. PROSIDING SNF 2025, 14, FA 24-31.