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Iwa Sungkawa
Bina Nusantara University
Computer Science & IT Engineering Mathematics

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Penerapan Regresi Linier Ganda untuk Mengukur Efisiensi Pola Penggunaan Air Tanah System Rice Intensification (SRI) di Kabupaten Bandung, Subang, dan Karawang Iwa Sungkawa
ComTech: Computer, Mathematics and Engineering Applications Vol. 6 No. 2 (2015): ComTech
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v6i2.2270

Abstract

This paper discusses the application of multiple linear regression to measure the efficiency and success of the pattern of groundwater using System of Rice Intensification. The purpose of this paper is to provide an overview of the procedures and the use of multiple linear regression analysis and to measure the impact of independent variables (habits of farmers P3A) in the use of groundwater. Multiple Linear Regression analysis is used to examine the relationships and dependencies between farmers habits P3A to the efficiency of water use patterns of SRI. The results show that the success and efficiency groundwater use is recommended in SRI pattern depends on the habits and behavior of the P3A farmers use ground water for their farming needs.
Kajian Proporsi Keterlibatan Perempuan (Gender) dalam Usaha Tani Padi di Kabupaten Bandung, Subang, dan Karawang Iwa Sungkawa
ComTech: Computer, Mathematics and Engineering Applications Vol. 5 No. 2 (2014): ComTech
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v5i2.2290

Abstract

This study aimed to evaluate the involvement of women in Rice Farming Enterprise in Regency of Bandung, Subang and Karawang in a government program of gender equality. Through the estimation of proportion and descriptive studies by comparing figures targeted by the government of at least 30%, it can be evaluated that there is variability in all regencies. Further studies are analytical studies to determine the alleged intervals and hypothesis testing for proportions and to conduct studies by comparing observations and determined value by using the standard normal distribution. The results of the study shows that the role of women/gender in Rice Farming Enterprise is very dominant at each stage of planting, weeding and harvesting stages. For other stages such as land cultivation, Countermeasures Integrated Pest, irrigation and distribution, the women's role is less dominant. This information is expected to support the Agricultural Sector policy makersin developing women's empowerment and gender equity.
Penerapan Rasio Sampling Dalam Pendugaan Rasio Lahan Kritis di Wilayah Das Jratun Iwa Sungkawa
ComTech: Computer, Mathematics and Engineering Applications Vol. 3 No. 1 (2012): ComTech
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v3i1.2419

Abstract

This study aims to examine the application of ratio estimators on a sampling method by taking the case of estimating the ratio of critical land of every county around Jratun watershed. Through the estimation, a general description of critical land deployment for each region (county) can be obtained. In addition, the estimator of hose/interval is also determined for the ratio with the real level of 0.05. The simple random sampling method is used in conducting the estimation of ratio of the critical land to the total land area. Theestimation results show that the ratio of the critical land to the total area for 19 districts reaches 23.72%.
Uji Homogenitas dengan Sebaran Khi-Kuadrat dalam Evaluasi Suatu Sistem Iwa Sungkawa
ComTech: Computer, Mathematics and Engineering Applications Vol. 2 No. 1 (2011): ComTech
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v2i1.2728

Abstract

This paper discusses the application of khi-square distribution in homogeneity of variance test on the control of a system used in a process considered normally spread with a mean of and a variance (degree of homogeneity) of . It is necessary to test the hypothesis statistically Ho: with the average μo value is unknown, and the statistic used is Khi-square distribution. On this occasion, an evaluation is executed upon a "Matsuyama" stabilizer (standard volt single phase (L)) to be used in Srengseng, Lenteng Agung, South Jakarta. Based on the test results of upon the variance with average standard voltage 220 volt, the electricity consumers in Srengseng are encouraged to use the stabilizer for household appliances that require voltage stability. By examining the voltage fluctuations at the location and stabilizer conditions (input range), the test result carried out through variance similarity test states that “Matsuyama” stabilizer is eligible and applicable in the area. 
Penerapan Ukuran Ketepatan Nilai Ramalan Data Deret Waktu dalam Seleksi Model Peramalan Volume Penjualan PT Satriamandiri Citramulia Iwa Sungkawa; Ries Tri Megasari
ComTech: Computer, Mathematics and Engineering Applications Vol. 2 No. 2 (2011): ComTech
Publisher : Bina Nusantara University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21512/comtech.v2i2.2813

Abstract

Forecasting is performed due to the complexity and uncertainty faced by a decision maker. This article discusses the selection of an appropriate forecasting model with time series data available. An appropriate forecasting model is required to estimate systematically about what is most likely to occur in the future based on past data series, so that errors (the differences between what actually happens and the results of the estimation) can be minimized. A gauge is required to detect the required the value of forecast accuracy. In this paper ways of forecasting accuracy of detection are discussed using the mean square error (MSE) and the mean absolute percentage error (MAPE). The forecasting method uses Moving Average, Exponential Smoothing, and Winters method. With the three methods forecast value is determined and the smallest value of MSE and Mape is selected. The results of data analysis showed that the Exponential Smoothing is considered an appropriate method to forecast the sales volume of PT Satriamandiri Citramulia because it produces the smallest value of MSE and Mape. 
Co-Authors Ries Tri Megasari