Vita Ratnasari
Jurusan Statistika Institut Teknologi Sepuluh Nopember

Published : 7 Documents
Articles

Found 7 Documents
Search

ESTIMATION AND STATISTICAL TEST IN BIVARIATE BINARY PROBIT MODEL Ratnasari, Vita; Purhadi, Purhadi; Ismaini, Ismaini; Suhartono, Suhartono
Jurnal ILMU DASAR Vol 12 No 1 (2011)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (191.357 KB)

Abstract

One of the models that can be used to analyze two binary response variables data is bivariate binary probit model. This paper tried to estimate the parameters of bivariate binary probit model using Maximum Likelihood Estimationmethod, whereastoget the statistical test using Maximum Likelihood Ratio Test method.
PEMODELAN PERSENTASE KRIMINALITAS DAN FAKTOR-FAKTOR YANG MEMPENGARUHI DI JAWA TIMUR DENGAN PENDEKATAN GEOGRAPHICALLY WEIGHTED REGRESSION (GWR) Simamora, Panji Anugrah; Ratnasari, Vita
Jurnal Sains dan Seni ITS Vol 3, No 1 (2014)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat (LPPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23373520.v3i1.6107

Abstract

Kejahatan atau kriminalitas merupakan perbuatan seseorang yang dapat diancam hukuman berdasarkan KUHP atau undang-undang serta peraturan lainnya di Indonesia. Pada tahun 2010 Polda Jawa Timur menduduki peringkat keempat jumlah kriminalitas tertinggi di Indonesia setelah Polda Metro Jaya, Polda Sumatera Utara dan Polda Jawa Barat. Perbedaan karakteristik geografis menyebabkan perbedaan atau keterikatan faktor ekonomi, sosial, budaya yang juga berpengaruh pada tindakan kriminalitas di setiap daerah. Karena itu penelitian ini akan memodelkan persentase kriminalitas dan faktor-faktor yang mempengaruhinya di Provinsi Jawa Timur dengan pendekatan Geographically Weighted Regression (GWR). Dari hasil penelitian ini didapatkan bahwa adanya pengaruh spasial dalam pemodelan persentase kriminalitas di Jawa Timur. Pemilihan pembobot dilakukan dengan cara memilih pembobot yang memiliki nilai AIC terkecil yaitu fix gaussian. Wilayah yang berdekatan cenderung memiliki kesamaan faktor-faktor yang mempengaruhi persentase kriminalitas di Jawa Timur. Variabel kepadatan penduduk dan persentase penduduk migran berpengaruh signifikan pada sebagian besar kabupaten/kota di Jawa Timur. Model GWR menghasilkan R2 sebesar 86,95 persen lebih besar dari model OLS yaitu 54,1 persen.`
PENGELOMPOKKAN KELURAHAN DI KOTA SURABAYA BERDASARKAN KRITERIA PEMBENTUKAN KAMPUNG KELUARGA BERENCANA Khotimah, Khusnul; Ratnasari, Vita; Ratna, Madu
Jurnal Sains dan Seni ITS Vol 7, No 2 (2018)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat (LPPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23373520.v7i2.35272

Abstract

Salah satu upaya yang dilakukan BKKBN untuk membumikan kembali program KKBPK adalah dengan terus membangun Kampung KB di seluruh wilayah Indonesia. Kampung KB merupakan satuan wilayah setingkat RW, dusun atau setara, yang memiliki kriteria tertentu, dimana terdapat keterpaduan program kependudukan, keluarga berencana, dan pembangunan keluarga dan pembangunan sektor terkait. Penelitian ini bertujuan untuk mengelompokkan kelurahan di Kota Surabaya berdasarkan kriteria pembentukan Kampung KB menggunakan analisis klaster sehingga diharapkan dapat membantu untuk menentukan wilayah yang akan dijadikan Kampung KB. Pengelompokkan yang dihasilkan, selanjutnya akan dilakukan analisis One Way MANOVA untuk mengetahui apakah terdapat perbedaan antar kelompok yang terbentuk berdasarkan kriteria pembentukan Kampung KB. Hasil analisis klaster menunjukkan bahwa terbentuk lima kelompok kelurahan di Kota Surabaya berdasarkan kriteria pembentukan Kampung KB serta metode pengelompokkan yang terbaik adalah metode ward?s. One Way MANOVA memberikan hasil bahwa terdapat perbedaan rata-rata antar kelompok kelurahan yang terbentuk berdasarkan kriteria pembentukan Kampung KB.
Model Probit Spasial pada Faktor-Faktor yang Mempengaruhi Klasifikasi IPM di Pulau Jawa Puspita, Feni Ira; Ratnasari, Vita; Purhadi, Purhadi
CAUCHY Vol 2, No 4 (2013): CAUCHY
Publisher : Mathematics Department, Maulana Malik Ibrahim State Islamic University of Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18860/ca.v2i4.3116

Abstract

Human pembagunan Index (HDI) is a composite index that includes three basic dimensions of human development is considered to reflect the status of the populations basic abilities of health, educational attainment, and purchasing power. Data IPM classified into four, namely low, lower middle, upper middle, and high. Therefore, determining the HDI can be done with the data probit regression approach. In the data found that there were similarities between the HDI value of geographically adjacent regions which resulted in the classification of the adjacent HDI same region. This is presumably due to the inter-regional dependency. This phenomenon is suspected because of the spatial dependencies can be described through spatial methods. From the explanation above, the HDI of data in this study are based on the spatial probit regression method are compared with the probit method. This study aims to assess the predictors for estimating parameters and testing parameters were applied to the data classification IPM in Java. MCMC is used as a method of estimating the parameters in the assessment. While the assessment test parameters used are 25% to 75% of the estimated parameters
ANALISIS BIAYA UNTUK PEMILIHAN SUMBER DAYA LISTRIK UTAMA RUMAH POMPA GREGES Yudiono, Yudiono; Lasminto, Umboro; Ratnasari, Vita
Journal of Civil Engineering Vol 33, No 1 (2018)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (710.178 KB) | DOI: 10.12962/j20861206.v33i1.4564

Abstract

The central government through the Directorate of Environmental Sanitation Development (PPLP) of the Directorate General of Human Settlements of the Ministry of Public Works and Public Housing participated in the implementation of drainage of Surabaya by providing assistance for the construction of Greges pump house. The pump house Greges as one of the pump house located in Surabaya, is one of the drainage system controllers around Bozem Morokrembangan area especially the flow of water along the Greges channel which is also an outlet for several channels. In the aid of the pump house choose to use Genset as the main power source (SDL). While the Government of Surabaya always wants the use of SDL from PLN. The purpose of this study was to analyze the use of SDL to meet the needs of the Greges Pump House by performing the cost analysis required for the Greges pump house for the use of Genset and PLN power sources, and determining the better SDL selection that would be used to meet the needs of the Greges pump house. Based on the analysis of costs, the use of generators is better than PLN in the investment cost analysis. Based on PLN operational cost analysis is better than generator. In the first year period the total cost for the use of PLN is Rp. 5.102.223.905 greater than the generator Rp. 4.789.084.970,16,, in the second year the cost of using PLN approaches the generator cost, and on the third and so the use of generator is higher than the PLN.
ANALISIS KUALITAS LAYANAN BONGKAR MUAT DI PT TERMINAL PETIKEMAS SURABAYA DENGAN METODE SERVQUAL DAN QFD Bastian, Endhy; Ratnasari, Vita; Achmadi, Fuad
JURNAL AKUNTANSI DAN MANAJEMEN Vol 2 No 1 (2018): AUGUST
Publisher : UNUSA Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33086/amj.v2i1.65

Abstract

  PT Terminal Petikemas Surabaya (TPS) has become one of the port services company has been trusted by various Indonesian and international companies in the management of international and domestic containers as well as various other loading and unloading services. PT TPS in providing international container management services is required to adjust its service level in accordance with international standards. Based on the Key Performance Indicator (KPI), the performance of PT TPS compared to some international ports in terms of Trund-Around Time (TRT), Gross Mover Per Hour (GMPH), and Berth Move Per Hour (BMPH) are still far behind with ports in UAE, Asia Pacific and India. The low performance of PT TPS based on the three indicators shows that the quality of service PT TPS still needs to be repaired. In this research, perception analysis and customer expectation with Service Quality (SERVQUAL) method to measure service quality of PT TPS. The gap between perception and customer expectation from Service Quality (SERVQUAL) is improved by Quality Function Deployment (QFD) method. And based on the two analysis, the preparation of strategies that should be applied by PT TPS to improve the quality of service. The results obtained show that all dimensions have satisfaction level “satisfied” which means that customers value the services provided by PT TPS is enough to meet expectations but still not maximal. Furthermore, Cartesius diagram analysis showed that there are 5 indicators that need improvement either immediately. The QFD analysis is performed to determine the recommended improvements on 5 indicators. Indicators that require top priority are indicators related to the competence of officers, especially administrative officers. So the management recommendation is to make Standard Operating Procedure (SOP) for each activity in port for administration officer
ANALISIS KUALITAS LAYANAN BONGKAR MUAT DI PT TERMINAL PETIKEMAS SURABAYA DENGAN METODE SERVQUAL DAN QFD Bastian, Endhy; Ratnasari, Vita; Achmadi, Fuad
JURNAL AKUNTANSI DAN MANAJEMEN Vol 2 No 1 (2018): Accounting and Management Journal
Publisher : UNUSA Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33086/amj.v2i1.65

Abstract

  PT Terminal Petikemas Surabaya (TPS) has become one of the port services company has been trusted by various Indonesian and international companies in the management of international and domestic containers as well as various other loading and unloading services. PT TPS in providing international container management services is required to adjust its service level in accordance with international standards. Based on the Key Performance Indicator (KPI), the performance of PT TPS compared to some international ports in terms of Trund-Around Time (TRT), Gross Mover Per Hour (GMPH), and Berth Move Per Hour (BMPH) are still far behind with ports in UAE, Asia Pacific and India. The low performance of PT TPS based on the three indicators shows that the quality of service PT TPS still needs to be repaired. In this research, perception analysis and customer expectation with Service Quality (SERVQUAL) method to measure service quality of PT TPS. The gap between perception and customer expectation from Service Quality (SERVQUAL) is improved by Quality Function Deployment (QFD) method. And based on the two analysis, the preparation of strategies that should be applied by PT TPS to improve the quality of service. The results obtained show that all dimensions have satisfaction level ?satisfied? which means that customers value the services provided by PT TPS is enough to meet expectations but still not maximal. Furthermore, Cartesius diagram analysis showed that there are 5 indicators that need improvement either immediately. The QFD analysis is performed to determine the recommended improvements on 5 indicators. Indicators that require top priority are indicators related to the competence of officers, especially administrative officers. So the management recommendation is to make Standard Operating Procedure (SOP) for each activity in port for administration officer