1. BPS-Statistics of Tapanuli Tengah, Jakarta, North Sumatera, Indonesia
2. Jakarta Smart City, Department of Communication, Informatics, and Statistics, Jakarta, Indonesia
3. Research Center for Data and Information Sciences, Research Organization for Electronics and Informatics, National Research and Innovation Agency, Bandung, West Java, Indonesia
4. Department of Statistical Computing, Polytechnic Statistics STIS, Jakarta, Indonesia