Articles

KAJIAN ESTIMASI-M IRLS MENGGUNAKAN FUNGSI PEMBOBOT HUBER DAN BISQUARE TUKEY PADA DATA KETAHANAN PANGAN DI JAWA TENGAH

MEDIA STATISTIKA Vol 5, No 1 (2012): Media Statistika
Publisher : Jurusan Statistika FSM Undip

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Abstract

Ordinary Least Squares (OLS) is one method of parameter estimation in regression analysis. However, the presence of outliers can cause estimation of regression coefficients obtained are not exact. Act of throwing away an outlier is not a wise move, because sometimes outliers provide significant information. Therefore, robust regression methods are needed to data contain outliers. This paper will use robust regression estimation method by M-estimation. This estimation use Iteratively Reweighted Least Squares (IRLS) method with weighting function by Huber and Tukey Bisquare. IRLS is applied to the case of food security in Central Java in 2007 that is influenced by the stock of rice, harvested area, average production, price of rice and the amount of consumption. The purpose of this writing is to compare goodness of M-estimation IRLS using Huber and Tukey Bisquare function in estimating the model parameters of food security in Central Java in 2007. Based on the research results can be concluded that the M-estimation by the Tukey Bisquare is better recommended than Huber function. This can be seen by value results of Mean Square Error and determination coefficient

KARAKTERISTIK UMUR PRODUK PADA MODEL WEIBULL

MEDIA STATISTIKA Vol 2, No 2 (2009): Media Statistika
Publisher : MEDIA STATISTIKA

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Abstract

Long life of product can reflect its quality. Generally, good products have long life. There are functions that relationship with life as reliability function, hazard rate function, mean time to failure, and mean residual life. In this writing those functions be used to product which has the failure time of a component is distributed Weibull. The reliability function is exponential function. For value θ is constant, the reliability value is decrease function, if γ is greather with respect to time. Meanwhile hazard rate function could be monotone increase function, constant function, monotone decrease function, if doing by simulation with shape parameter by one. Really, the mean time to failure product hang on Weibull distribution parameters. But the mean residual life is reciprocal with respect to its reliability.   Keywords:      Weibull Model, Reliability and Hazard Rate Functions, Mean Time to Failure, Mean Residual Life.

ANALISIS KUALITAS PELAYANAN DAN PENGENDALIAN KUALITAS JASA BERDASARKAN PERSEPSI PENGUNJUNG

MEDIA STATISTIKA Vol 4, No 1 (2011): Media Statistika
Publisher : Jurusan Statistika FSM Undip

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Abstract

One of the factors which determine customer safisfaction is costumer perceive about service quality that focus to five service quality dimension that are tangible, reliability, responsiveness, assurance, and empathy. This research study service serve quality at UPT Perpustakaan Universitas Diponegoro Semarang with object to know customer perceive with respect to some variables in service quality dimension and satisfaction level. Importance-Performance Analysis used to map relation between importance with performance of respective variables to be and see gap between performance with importance of them variables. Customer Satisfaction Index (CSI) used to analyze all satisfaction respondent level. The T2 Hotelling control chart to know servicing process stability with respect to costumer perceive. Research result shows that the gap is all negative value. It means library performance that represented by 21 variables include 5 service quality dimension still under expected costumer. The value CSI is 62,903% that meaning at enough satisfaction criterion. There are five points at above upper control limit in the T2 Hotelling control chart. Therefore it can be said that process haven’t been controlled by statistical.   Keywords: Service Quality, Importance-Performance Analysis, Customer Satisfaction Index, Hotelling T2 Control Chart.

ANALISIS FAKTOR DOMINAN PENOLAKAN ATAS PENGGUNAAN SISTEM AKUNTANSI KEUANGAN (Studi Kasus Pada Perguruan Tinggi Negeri Di Jawa Tengah)

JURNAL AKUNTANSI DAN AUDITING Volume 5, Nomor 2, Tahun 2009
Publisher : JURNAL AKUNTANSI DAN AUDITING

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Abstract

In 2011, the Higher Education (Dikti) compiled financial accounting system (FAS) for stateuniversities (PT) in Indonesia. Preparation of FAS entrusted to AB university. In general, the useof information technology (IT) has many usefullness. In particular, the use of IT (such as FAS)can difficulties cause due to weakness. FAS unflexible, so it is not easily/quickly overcome if thereis development. Programer FAS must know the needs of information the user, but AB universitynever surveyed to the needs of universities in Indonesia. Another drawback, the dependenceon programmers FAS. Weakness of FAS allows universities the denial to use it. So far, thereis no provision of Higher Education (Dikti) that the universities in Indonesia must use FASprepared by AB university. This study aims to investigate the dominant factors from the denialof FAS. These factors are social factors, compliance tasks, the conditions that facilitate, affect,complexity, and long-term consequences. Population was staff of the accounting department andstaff of the monitoring and evaluation department to universities in Central Java. Data collectionthrough surveys and samples were determined by convenience sampling method. Questionnaireswere returned 33 sets and decisions are made based on 33 respondents. Data collection throughsurveys and samples determined by convenience sampling method. Further testing data quality,example: outliers tests, validity tests, and reliability tests of data. Testing hypotheses using multipleregression. The results of this study that social are the dominant factor in denialling the use ofFAS. Another factor, there are the compliance tasks and long-term consequences were moderatefactors. Both of these factors are sometimes used, sometimes not used as consideration a decisionrefusing to FAS. When the factors of conditions that facilitate, affect, and the complexity is notrelated to the denial of FAS.

ANALISIS PENGARUH RASIO KEUANGAN DAN FAKTOR NON KEUANGAN TERHADAP PENERIMAAN OPINI AUDIT GOING CONCERN (Studi Empiris Pada Perusahaan Manufaktur di BEI tahun 2008-2010)

JURNAL AKUNTANSI DAN AUDITING Volume 7, Nomor 2, Tahun 2011
Publisher : JURNAL AKUNTANSI DAN AUDITING

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Abstract

This research was aimed to analyze and to obtain empirical evidences on the relationship betweenfinancial ratios (liquidity, profitability, activity, leverage, sales growth, market value) and nonfinancial factors (company size, public accountant reputation, previous audit report, auditorclienttenure,opinion shopping, audit lag) that affecting auditor’s decision to give a goingconcern audit opinion. The population in this research is manufacturing companies listed atIndonesian stock exchange from 2008-2010, the sampling was conducted by purposive samplingmethod, by criteria of the samples are companies had negative net income after tax at least twoperiod of financial statement. The results indicate that profitabilty, market value, previous auditreport, audit client tenure and opinion shopping are significantly affect the acceptence of goingconcern audit opinion. On the other hand, liquidity, activity, leverage, sales growth, companiessize, public accountant reputation, audit lag does not have affect on the acceptence of goingconcern audit opinion.

MODEL PERTUMBUHAN DUA SAMPEL

MEDIA STATISTIKA Vol 1, No 1 (2008): Media Statistika
Publisher : Jurusan Statistika FSM Undip

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Abstract

Growth curve model is generalization of the multivariate regression models. This paper determine growth curve model at two samples of ras. They are observed body weight after given by substances. The problems will be done are testing for an outlier, testing for multivariate normality, testing for hogeneous, test of the adequacy of the model, and estimate of the parameters model. In doing computation and visualization of statistics at needed formulas, use up date some softwares, such as SAS, Minitab, MATLAB, etc. If the estimated model is known, it can be used to some objectives. The estimate model could be applied to predicted tool for next time, give characteristic and properties of the model. The growth of rat which be given thyroxin substance, at beginning time cause significant increasing of the body weight, but after at sixth weeks, given substance imply significant decreasing of their body weight, too. Meanwhile for the rat be given thyouracil, at beginning time to tenth weeks, their body weight affect slowly increasing by continue. Therefore thyroxin substance should be given before seventh weeks, but for thyouracil substance could be given continuosly if cause increasing the body weight. This result could be used to optimalization of rat growth.   Key words: Multivariate normal test, Adequacy of model test, Growth curve model.

TAKSIRAN UMUR SISTEM DENGAN UMUR KOMPONEN BERDISTRIBUSI SERAGAM

MATEMATIKA Vol 7, No 1 (2004): JURNAL MATEMATIKA
Publisher : MATEMATIKA

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Abstract

Sistem yang dibentuk oleh beberapa komponen, rangkaiannya dapat secara seri atau paralel. Untuk mengetahui suatu sistem berfungsi atau tidak, dapat dilihat dari fungsi bentuk. Dari fungsi bentuk ini, fungsi reliabilitas sistem akan dapat ditentukan. Selanjutnya berdasarkan fungsi reliabilitas sistem, dapat diketahui umur sistem. Khusus dalam tulisan ini, umur komponennya diasumsikan berdistribusi seragam. Dengan mengetahui umur sistem, maka dapat ditentukan waktu garansi produk.

Perbandingan Grafik Pengendali Moving Average dan Geometric Moving Average pada Data Berkelompok

MATEMATIKA Vol 7, No 3 (2004): JURNAL MATEMATIKA
Publisher : MATEMATIKA

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Abstract

Untuk mengetahui proses produksi sudah memenuhi standar mutu dapat menggunakan grafik pengendali mutu. Pemilihan dan penggunaan metode pengendali mutu yang benar akan menghasilkan keputusan yang optimal. Dalam tulisan ini akan dibandingkan dua metode untuk perubahan nilai yang kecil, yaitu grafik pengendali moving average dan grafik pengendali geometric moving average pada masalah kekentalan cat. Dengan mengetahui sifat-sifat yang dihasilkan oleh masing-masing grafik tersebut dan membandingkannya, maka dapat dipilih salah satu dari metode tersebut lebih baik dari metode lainnya. Sehingga metode yang lebih baik itu diharapkan dipakai pada masalah yang serupa, agar didapat keputusan yang lebih akurat.

PEMODELAN REGRESI ZERO-INFLATED NEGATIVE BINOMIAL (ZINB) UNTUK DATA RESPON DISKRIT DENGAN EXCESS ZEROS

Jurnal Gaussian Vol 1, No 1 (2012): Wisuda Periode Oktober 2012
Publisher : Jurusan Statistika UNDIP

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Abstract

Zero-Inflated Negative Binomial (ZINB) regression is one of the methods used in troubleshooting overdispersion due to excessive zero values ​​in the response variable (excess zeros). ZINB regression model was based on the negative binomial distribution resulting from a mixture distribution between Poisson distribution  withis value of random variable which gamma distributed. ZINB regression parameter estimation can be performed by using Maximum Likelihood Estimation (MLE) method then is followed by the EM algorithm (Expectation maximization) procedure and Newton Rhapson. Test the suitability of the model simultaneously performed using Likelihood Ratio test and significance testing parameters individually performed with Wald test statistics. The model is applied to the case of car insurance obtained PT. Insurance of Sinar Mas Semarang Branch in 2010 in the form of data many policyholders filed claims to the PT. Sinar Mas Semarang Branch Insurance. Response variable is the number of claims submitted to the PT. Insurance of Sinar Mas Semarang Branch, while the predictor  variable is the age car and the type of coverage that consists of All Risk, Total Lost Only (TLO), and the joint between All Risk and Total Lost Only (TLO). From the analytical result obtained the conclution that the age of the car and the type of coverage affects number of claims filed by the policyholder to the PT. Insurance of Sinar Mas Semarang Branch in 2010.

PENGARUH PENAMBAHAN EXTRACELLULARY POLYMERIC SUBSTANCES (EPS) DAN AGRI SIMBA SEBAGAI BIOSTIMULAN DAN BIOAUGMENTASI TERHADAP LAJU DEGRADASI LIMBAH LUMPUR MINYAK DARI IPAL PT. INDOFOOD CBP

Jurnal Teknik Lingkungan Vol 2, No 2 (2013): Jurnal Teknik Lingkungan
Publisher : Diponegoro University

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Abstract

ABSTRACTMany environmental pollution caused by the disposal of industrial waste directly discharged into the environment, it will cause damage to the environment. Waste oil sludge has not been processed further. The high oil content of waste oil sludge will cause soil pollution in the ecosystem.In this research, waste oil sludge from WWTP PT. Indofood CBP. This study uses the technique of bioremediation in reducing the rate of degradation of waste oil sludge PT. Indofood CBP. Characteristics that can be seen is a reduction in the levels of oil concentration in the waste oil sludge.In this research, the addition of polymeric Extracellulary Substances (EPS) is useful as a nutrient in the process biostimulation, while the addition of Simba Agri useful as additional microorganisms to support bioaugmentation  process. Extracellulary polymeric Substances (EPS) were added varying volume was 50 mL and 100 mL.

Co-Authors Abdul Hoyi Abdul Hoyyi Abdul Mufid Abdulah, Baehaki Adimulya Nurrahman Aditya Eka Laksana Adiwirman Adiwirman, Adiwirman Afianti Sonya Kurniasari Afif, Achmad Agung Santoso, Agung Agung Sugeng Widodo Agus Rusgiyono Agus Setyawan Agus Subagio Agustono Agustono, Agustono Ahadi Abdillah, Annur Ahmad Reza Aditya Akbar, M. Aldika Alan Prahutama Aldila Khairina Sissandhy Alfita Rakhmayani Alfred Yunandro Markus, Alfred Amin Alamsjah, Moch Amin Nursudi Aminuddin Aminuddin Amirudin Amirudin Ana, Testian Yushli Angga Saputra Desti Anggun Prima Gilang Rupaka, Anggun Prima Anik Waryanti Anisa Alfiani Rahayu Anissa Pangastuti Anjani, Pipin Tri Anne Katherina, Anne Anugraheni, Avida Arif Sudarmanto, Arif Ariffandita Nuri Muttaqin Ariyanto Ariyanto Ariyanto Wibowo, Ariyanto Asismarta Asismarta, Asismarta Atika Elsadining Tyas, Atika Elsadining Avida Nugraheni C. Ayu Ambarsari, Ayu Aziz Nur Bambang Azyati, Mazaya Bambang Hermanto Bambang Yulianto Bayu Ariawan Bayu Romadhona, Bayu Bayyina Zidni Falah, Bayyina Zidni Beni Vandra, Beni Bonis Rekoyoso Budi Harsanto, Aris Budi Warsito cahyadi cahyadi Chandra Lestari Asih Cut Nur Aisyah Cyndia Putri Lupita Dedy Haryanto Dessy Tri Nugraheni Deviannisa Nurlaeli Dewi Setya Kusumawardani Diah Safitri Dian Ika Pratiwi, Dian Ika Dini Aryani Djalal Er Riyanto Dody Azhar Mutawakkil Manjo Dora Resa Ekemeviane, Dora Doron Tri Utomo Dwi Ispriyanti Dwi Siwi Handayani Eka Triakuntini Elaeis Noviani R Elaeis Noviani Ratnasari, Elaeis Noviani Elen Dwi Pradewi Ellyana, Veronika Endina Sulistiarini Endro Sutrisno Erna Puspitasari F Soeroso, F Fadhilah, Lulut Fanniya Dyah Prameswari Fatkhan Arissetya Fifi Puspita Firdha Rahmatika Pratami, Firdha Rahmatika Fitri Damastuti Syarifah Fitri Risalawati Futry Tria Christy, Futry Galih Maraseta W H Prasaja Galih Satria Dirgantara, Galih Satria Galuh Ayu Prameshti Galuh Sabhrina Nugrainy Ginanjar Trilaksono Gunanti Mahasri Gunawan Gunawan Hantarum, Hantarum Hapsari, Amalia Hari Suprapto Harini Harini Hariyadi, Heru Hasbi Yasin Herninda Tanjungsari, Herninda Heru Susanto Heru Tjahjana Hesti Sari Dewi Hildawati Hildawati, Hildawati Ibnu Athoillah Iin Novitasari Ilham Ilham Imam Buchori Ina Tri Wahyuningrum Irawan Wisnu Wardhana Irawan Wisnu Wardhana Ispriyansti, Dwi Ita Tetriana Agustini Jatmiko Endro Suseno Jesicha Mayangsari, Jesicha Johan Adi Wicaksana, Johan Adi Junaidi Junaidi Kiki Ramayana Kismiyati, Kismiyati Kristiani Kristiani Kristiara, Sandy Kurnia Nur Widya Utami, Kurnia Kurniasih Nur Afifah Kurniawan, Febri Kussigit Santosa Liem Ek Bien Liem Ek Bien Lintang Afdianti Nurkhasanah, Lintang Afdianti Listifadah Listifadah luhung, Putro adi Lundu Bontor Sihite Lusida, Terrence Timothy Evan Maidiah Dwi Naruri Saida, Maidiah Dwi Naruri Malik Hakam Maliki Hakim, Dyo Mamuroh Mamuroh Mardison Purba Mariati S Manullang Mario Chris Reynaldi, Mario Martalina Kalincayo Purba, Martalina Martalina Kalincayo Purba, Martalina Kalincayo Martina Dita F. Irawati Mintasih Indriayu, Mintasih Miranti Marita Sari Moch. Abdul Mukid Mochammad Abdul Mukid, Mochammad Abdul Mochammad Qomaruddin, Mochammad Mochtar Hadiwidodo Mohammad Al Hazmi Mohammad R, Mohammad Mohammad Rama Fadillah Soeroso Monalisatika Winih Isti N Winih Isti N Mufidah, Afif Muhamad Faliqul Asbah Muhammad Alhan Muhammad Fachri Maulana Muhammad Nur Muhyidin Nur Rohman Mukti, Oktana Dari Munaji, Munaji Munifatul Izzati Mustafa Mustafa Mustafid Mustafid Nailatis Shofia Nasroni, Nasroni Nesvi Intan Oktajayanti, Nesvi Intan Nia Yusmaydiyanti, Nia Nindarwi, Daruti Dinda Nonik Brilliana Primastuti Nourma Yulia, Nourma Nova Yanti Gultom, Nova Yanti Novalia Gultom Novi Melawati Nur Musrifah Rohmaningsih, Nur Musrifah Nurfiatin, Titin Nurindra, Azka Prima Nurobingatun, Siti Nuroqi, Fathimatuzzahra Syahrozad Nurul Qomariyah Patricia Deby, Patricia Paundra Sari, Paundra Pertiwi Andarani Pradana Sahid Akbar Pradana, Dandi Pradipta, Aryandini Intan Pramestiara Dewiga, Pramestiara Pramudita, Rheza Andrean Pranata Anggakara Pratama, Yudhi Pratikso Pratikso Priska Rialita Hardani, Priska Rialita Priyanto, Asep Purwanto Purwanto Putu Handoko Murti Putu Jaya Permana Rafika, Lutfia Citra Ayu Rahayu Kusdarwati Rahmaddian Primasari Rahman, Agus Nur Rahmat Randy Arbie, Rahmat Raras Wanudyajati Rasyid, Krisna Slamet Ratih Nurmalasari, Ratih Ratna Novita Sari Retno Suryani, Retno Retza Bahtiar Anugrah, Retza Bahtiar Riana Ayu Andam Pradewi Ridha Ramandhani, Ridha Ririn Sulpiani Rita Rahmawati Riza Fatoni Hidayat Rizaldi, Rachmat Rizka Asri Brilliani, Rizka Asri Rizki Ariyanto, Rizki Rizky Ade Putranto, Rizky Ade Rukun Santoso Safrudin, Dwi Sahid Akbar Pradana, Sahid Akbar Salman Alfarisy Totalia Saputra, Bagos Aji Saputro, Yayan Adi Sari, Wulan Merdeka Sartikasmawaty Sinaga Sarwanto Sarwanto Satiti Nurwasini Wijati, Satiti Satrio Adi Wibowo Satriyo Adhy Sayekti, Elmi Nur Sekar Niken Kartika Septian Dwi Setiadi Setyantini, Woro Hastuti Sheny Nurul Aini Sigit Sigit Siti Nurlatifah, Siti Slamet Wahyudi Solekakh, Nur Aeniatus Sony Cokro Handoko, Sony Cokro Sri Hartini Sri Nitiswati Sri Puatin Sri Sumiyati Sri Sumiyati Suasti Aswan Sudjito Soeparman Sugito Sugito Suhartono Suhartono SUHARYANTO SUHARYANTO Sulmartiwi, L. Sulton Syafii Katijaya Sunarto Sunarto Sunaryo Sunaryo Suparti Suparti Supriyanto Supriyanto Suripin Suripin Sutrisno sutrisno Syafrudin Syafrudin Tarina Rahmayani Tarno Tarno Tatik Widiharih Taufan Fahmi Taufik Dani, Taufik Tia Maulida Nurbaiti Tiara Sukma Pertiwi, Tiara Titik Istirokhatun Tito, Istikhara Mentari Tjahjaningsih, Wahju Tri Retnaning Nur Amanah, Tri Retnaning Nur Tri Retnaningsih Soeprobowati Triastuti Wuryandari Udi Harmoko V. Raras Anindita Vica Nurani, Vica Victoria Dwi Murti Wahyu Nugraha, Wahyu Wardhani, Andriana Kusuma Wawan Trisnadi Putra, Wawan Trisnadi Wetty Anggun Werti, Wetty Anggun Wicaksono, Aji Prima Widha Sunarno widowati widowati Widyastuti Kusuma Wardhani Wiharyanto Oktiawan Winardi Dwi Nugraha Winardi, Yoyok Winda Rosiana Pratiwi Woro Partini Maryunani Wuragil Septi Wulandari Yastri Noer Amalina, Yastri Yaya Finayani Yovina Mulyadi Yuciana Wilandari Zainus Salimin