Kriminalitas merupakan salah satu masalah sosial ekonomi yang sampai saat ini belum terselesaikan di Indonesia. Meski Indonesia masuk kategori negara yang aman dikunjungi, kenyataannya masih banyak masyarakat Indonesia yang mengalami tindak kriminalitas. Penyelesaian masalah sosial ekonomi ini menjadi sangat penting karena menyangkut keamanan dan kenyamanan masyarakat. Penelitian ini bertujuan mengidentifikasi faktor-faktor yang memengaruhi tingkat kriminalitas di Indonesia dan menentukan model terbaik dari setiap provinsi dengan membandingkan antara model regresi data panel dan model Geographically Weighted Panel Regression (GWPR). Data penelitian ini terdiri atas 34 provinsi di Indonesia dari tahun 2016 sampai 2020. Analisis yang digunakan adalah analisis regresi data panel dan GWPR. Hasil analisis menunjukkan model adaptive kernel gaussian GWPR merupakan model terbaik dengan sebesar 69,89% dan AIC sebesar 167,4585. Pemodelan GWPR menghasilkan persamaan model dan peubah berpengaruh signifikan untuk setiap provinsi. Secara umum terdapat lima peubah yang berpengaruh signifikan terhadap tingkat kriminalitas, yaitu persentase penduduk miskin, tingkat pengangguran terbuka, Produk Domestik Regional Bruto atas dasar harga konstan per kapita, indeks pembangunan manusia, dan rata-rata lama sekolah.
Kesehatan lingkungan merupakan bagian daripada kesehatan masyarakat pada umumnya. Jika setiap provinsi dikaitkan dengan pencapaian indikator kesehatan lingkungan, maka pencapaiannya tidak akan sama. Pengelompokan provinsi akan mempermudah pemerintah untuk menentukan prioritas bagi pembangunan kesehatan lingkungan di Indonesia. Pengelompokan provinsi pada penelitian ini menggunakan analisis gerombol. Metode yang digunakan adalah k-rataan karena memiliki rasio simpangan baku terkecil dibandingkan dengan metode analis gerombol lainnya. Hasil pengelompokan yang diperoleh adalah empat gerombol. Gerombol pertama terdiri dari satu provinsi yang memiliki karakteristik pencapaian indikator PLM tinggi dan pencapaian indikator SBS terkecil. Gerombol kedua terdiri dari enam provinsi yang memiliki pencapaian indikator SBS tinggi dan pencapaian indikator PLM terkecil. Gerombol ketiga terdiri dari 20 provinsi yang memiliki karakteristik pencapaian indikator TFU tinggi dan pencapaian indikator PLM terkecil. Gerombol keempat terdiri dari tujuh provinsi yang memiliki karakteristik pencapaian indikator PKAM tinggi dan pencapaian indikator PLM terkecil.
National examination scores can be a basis for the government to make a mapping of education quality in order to increase it. The mapping can be done by using fuzzy cluster analysis. The objective of this experiment is to cluster districts/cities in Indonesia based on national examination score in natural and social science in 2014/2015 until 2017/2018 school year by using the fuzzy c-means method. The evaluation criteria that will be used are the standard deviation ratio, silhouette coefficient, and Xie Beni index. The best cluster size is two clusters, A and B. The clustering result shows cluster A has a higher mean from each subject than cluster B. Therefore, cluster A will be categorized as good, whereas cluster B as bad. The proportion of districts/cities that belong to cluster A decreased each year. The final cluster result can be determined by the mean of its degree of membership from those four school years. The analysis results show that the distribution of education quality is dominated in Java Island and squatter cities. East Nusa Tenggara, West Sulawesi, Central Sulawesi, and North Kalimantan don’t have any districts/cities belong to cluster A.
The identification of the cluster of consumer goods sector companies is enough important study to examine the characteristics of the company based on its marketing management factors. This study seeks to cluster 23 consumer goods sector companies based on 4 marketing management factors, which are production costs, promotion costs, distribution costs, and sales value in 2012-2016. There are two parts of clustering that are carried out, the clustering of consumer goods sector companies based on the time series pattern for each marketing management factor with the ward method, and clustering of consumer goods sector companies using multivariate panel data using the k-means method. The results of the clustering for each marketing management factor using the ward method produced 2 groups in each factor, with cluster 2 having an average of each factor greater than group 1. The companies found in cluster 2 were PT Indofood CBP Sukses Makmur, PT Indofood Sukses Makmur, PT Mayora Indah, PT Unilever Indonesia Tbk, PT Handjaya Mandala Sampoerna Tbk, International Investama Tbk, PT Kalbe Farma Tbk, and PT Tempo Scan Pacific Tbk. On the other hand, clustering of multivariate panel data produced 6 groups where group 5 is the cluster with the highest average on each factor. Group 5 consists of PT Indofood Sukses Makmur and PT Handjaya Mandala Sampoerna Tbk. The company with the highest value in multivariate panel data is also found in the results of the cluster with the highest value for each marketing management factor.
The transfer function model is a time series forecasting model that combines several characteristics ofthe ARIMA model one variable with several characteristics of regression analysis. This model is used to determine the effect of an explanatory variable (input series) on the response variable (output series). This study uses a transfer function model to analyze the effect of the exchange rate on Jakarta Islamic Index. The transfer function model is structured through several stages, starting from modelidentification, estimation of the transfer function model, and model diagnostic testing. Based on the transfer function model, Jakarta Islamic Index was influenced by Jakarta Islamic Index in one and two days earlier and the exchange rate in the same period and one to two days earlier. The forecasting MAPE value of 0.6529% shows that the transfer function model obtained is good enough in forecasting.
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