Efektivitas Faktor Pengontrol Linier pada Analisis Kerentanan Gerakan Tanah Menggunakan Metode Logistic Regression (Studi Kasus: Kabupaten Sumedang, Jawa Barat). = The Effectiveness of Linear Conditioning Factor in Landslide Susceptibility Analysis Using Logistic Regression Method (Case Study: Sumedang Regency, West Java).