Perbandingan Metode Stepwise, Best Subset Regression, dan Fraksi dalam Pemilihan Model Regresi Berganda Terbaik

Pemilihan model regresi terbaik adalah penentuan peubah bebas mana yang akan dimasukkan dalam model regresi sehingga model tersebut dapat menjelaskan perilaku peubah tak bebas dengan baik. Metode yang umum digunakan antara lain Stepwise dan Best Subset Regression. Metode Fraksi lebih diarahkan untuk penentuan model terbaik dengan kecenderungan multikolinear yang minimum. Dalam tulisan ini dikaji kelebihan dan kekurangan Metode Fraksi dibandingkan dengan Stepwise dan Best Subset Regression. Karena perbandingan ini difokuskan pada pemilihan model terbaik pada data yang memiliki masalah multikolinear maka contoh masalah yang diambil mewakili data dengan tingkat multikolinearitas yang tinggi. Hasil analisis terhadap kedua data tersebut dengan ketiga metode menunjukkan bahwa ketiga metode tersebut sama-sama dapat memberikan model terbaik. Kelebihan Metode Fraksi adalah mampu memberikan model terbaik yang memilki kecenderungan kolinearitas yang lebih rendah dari 2 metode lain. Sementara keharusan untuk mengambil fraksi merupakan kekurangan Metode Fraksi

Implementasi Manajemen Diri Mahasiswa Dalam Pendidikan Islam

Manajemen diri berarti menempatkan segala sesuatu secara teratur dalam hidup, dalam penggunaan waktu, pilihan, kepentingan, kegiatan, serta dalam keseimbangan fisik dan mental. Ini juga berarti mendorong diri untuk maju, mengatur semua unsur pribadi, mengendalikan potensi kemauan untuk mencapai hal-hal yang baik, dan mengembangkan berbagai aspek kehidupan pribadi untuk membuatnya lebih sempurna. Syarat pertama untuk semua mahasiswa untuk mencapai tujuan pendidikan mereka adalah motivasi diri. Kedua, organisasi diri, menyiapkan sebaik mungkin terhadap pikiran, tenaga, waktu, tempat, benda dan semua sumber daya lainnya dalam kehidupan seseorang sehingga mahasiswa mencapai efisiensi pribadi. Sehingga peran ganda sebagai mahasiswa dan pekerja dapat berjalan beriringan. Dari pengakuan informan tentang mahasiswa yang menerapkan strategi pembelajaran dalam hal memenuhi kebutuhan sendiri menunjukkan bahwa ada sejumlah mahasiswa yang sadar bahwa manajemen diri yang baik akan membawa keuntungan bagi mereka. Divisi waktu antara kuliah dan kegiatan lainnya tidak terganggu, jadwalnya menjadi terorganisir, kegiatan kemahasiswaan dan kegiatan lainnya tidak terganggu, bisa mengatur belajar, serta mampu mengatasi masalah yang dihadapi. Self management means putting everything on a regular basis in life, in the use of time, choice, interests, activities, as well as in the physical and mental balance. It also means pushing self to get ahead, arrange all the elements of the personal, controlling potential willingness to accomplish good things, and develop various aspects of private life to make it more perfect. The first requirement for all students to achieve their education goals is self-motivation. Secondly, self organization is setting up as well as possible against the thought, effort, time, places, objects and all other resources in one's life so that students achieved personal efficiency. So that his dual role as students and workers can go hand in hand. From recognition of the informant about the students apply learning strategies in regards to qualify themselves indicate that there are a number of students who are aware of a good self management will bring a profit for them. Among them, the Division of time between lectures and other activities are not interrupted, his schedule became organized, as students and other activities are not disrupted, could set out the lesson, as well as being able to tackle the problems facing it

Kompetensi Pedagogik Guru Dan Fasilitas Belajar Terhadap Prestasi Belajar Siswa Pada Mata Pelajaran Mengoperasikan Aplikasi Perangkat Lunak

The objectives of this research are to investigate: (1) the effect of the teacher\u27s pedagogical competency on the learning achievement in Operating-the-Software-Application subject matter of the students of the Department of Office Administration of State Vocational High School 1 of Surakarta in Academic Year 2012/2013; (2) the effect of the learning facility on the learning achievement in Operating-the-Software-Application subject matter of the students of the Department of Office Administration of State Vocational High School 1 of Surakarta in Academic Year 2012/2013; and (3) the simultaneous effect of the teacher\u27s pedagogical competency and the learning facility on the learning achievement in Operating-the-Software-Application subject matter of the students of the Department of Office Administration of State Vocational High School 1 of Surakarta in Academic Year 2012/2013. This research used the descriptive quantitative research method. The population of the research of the students in Grades XI and XII as many as 150. The samples of the research were 108 students. The samples were taken by using the stratified random sampling technique based on the table of Krejcie-Morgan with the error level of 5 %. The data of the research were gathered through questionnaire and documentation. They were then analyzed by using the multiple linear regression analysis aided by the computer program of SPSS 17.The results of the research are as follows: (1) there is a significant effect of the teacher\u27s pedagogical competency on the learning achievement in Operating-the-Software-Application subject matter of the students of the Department of Office Administration of State Vocational High School 1 of Surakarta in Academic Year 2012-2013 as indicated by the value of rcount= 0.443 > that of rtable = 0.187; (2) there is a significant effect of the learning facility on the learning achievement in Operating-the-Software-Application subject matter of the students of the Department of Office Administration of State Vocational High School 1 of Surakarta in Academic Year 2012-2013; as shown by the value of rcount = 0.427> rtable = 0.187); and (3) there is a simultaneously significant effect of the teacher\u27s pedagogical competency and the learning facility on the learning achievement in Operating-the-Software-Application subject matter of the students of the Department of Office Administration of State Vocational High School 1 of Surakarta in Academic Year 2012-2013 as pointed out by the value of Fcount = 24.736 >Ftable = 3.08

Pertumbuhan Dan Produksi Empat Varietas Padi (Oryza Sativa) Melalui Pengelolaan Air Dan Pemberian Pupuk Kandang Kerbau

Penelitian ini terdiri dari tiga faktor perlakuan dengan Rancangan Petak-Petak Terpisah. Perlakuan utama adalah perlakuan pemberian air yang terdiri dari dua taraf yaitu irigasi berselang dan penggenangan kontiniu. Anak petak adalah pupuk kandang kerbau yang terdiri dari tiga taraf yaitu tanpa perlakuan, C/N 19,80:1 dan C/N 10,15:1. Anak-anak petak adalah varietas yang terdiri dari Inpari 1, Inpari 13, Siramos dan Siboru Tambun. Hasil penelitian menunjukkan tinggi tanaman tertinggi pada varietas Inpari 1, Siramos dan Siboru Tambun pada perlakuan irigasi berselang. Berbeda halnya dengan Inpari 13 memperoleh tinggi tanaman tertinggi pada perlakuan penggenangan kontiniu. Keempat varietas memperoleh jumlah anakan per rumpun terbanyak pada perlakuan C/N 10,15:1. Varietas Inpari 1, Siramos dan Siboru Tambun memperoleh persentase gabah berisi per malai pada interaksi penggenangan kontiniu dan pupuk kandang kerbau C/N 10,15:1. Berbeda halnya dengan Inpari 13 memperoleh gabah berisi per rumpun terbesar pada interaksi penggenagan kontiniu dan pupuk kandang kerbau C/N 19,80. Varietas terbaik pada pengmatan tinggi tanaman, jumlah anakan per rumpun, jumlah malai per rumpun, persentase gabah berisi per malai dan panjang akar diperlihatkan oleh varietas Siboru Tambun

Pertumbuhan Dan Hasil Tiga Varietas Cabai Merah (Capsicum Annuum L.) Dengan Aplikasi Kalium Sulfat

This research was conducted in the experimental field of Agricultural Faculty of North Sumatra Muhammadiyah University with a height of ± 27 meters dpl, held in july - nov 2012. This study aims to determine the best dose frequency of k2so4 on growth and the result of red Chili varieties. This research was conducted using the split plot design with two factors; the varieties factor as the main plot with 3 kinds of varieties, named, V1 = TM 999, V2 = Lado, V3 = Landung; and the dose and frequency factors of k2so4 as subplot with 10 stages of treatment which is: K0 = 0, dose = 1.5 g / liter frequency 6 x (K1), 9 x (K2) and 12 x (K3), dose = 3 grams / liter frequency 6 x (K4), 9 x (K5) and 12 x (K6), dose = 4.5 g / liter frequency 6 x (K7), 9 x (K8) and 12 x (K9). The fertilizing was cunducted in the morning at 06.30 am - 08.30 am. The measured variables are plant height, numbers of chlorophyll, age of flower, numbers of flower, the percentage of deciduous fruit, weight of fruit/plot. Varieties show significant differences in plant height, numbers of chlorophyll leaf, age of flower, numbers of flower, the percentage of deciduous fruit, numbers of fruit, weight of fruit, weight of fruit per plot, moisture content and storability. Dose and frequency treatment of potassium sulfate is significantly different from controls. The best dose and frequency of this research is K9 which is 4.5 g/liter k2so4 with 12 time frequency during the growing season in TM 999 and Landung while the varieties of Lado are at dose of 3 g/liter of water with 12 times in giving (K5)

Analisis Sifat Optik Lapisan Tipis Bilayer Zno/tio2 yang Dideposisikan Menggunakan Metode Sol-gel Spray Coating dan Aplikasinya sebagai Fotodegradasi Zat Warna

ZnO/TiO2 bilayer thin films have been deposited on a glass substrate by using sol-gel method with spin coating technique. The quality of films deposited on buffer layer is found to be superior to those grown directly on a substrate. The ability of photodegradation of ZnO/TiO2 was observed through the dye test by various molarities of ZnO solution. ZnO sol was prepared by dissolving zinc acetate dehydrate into a solvent of isopropanol then add monoethanolamine and stirred for 30 min at 70°C. For preparing TiO2 sol, titanium tetraisopropoxide is first dissolved in a mixture containing isopropanol and ethanol at room temperature. Then after 30 min stirring, the sol was titrated with a mixture of acetic acid, ethanol and deionized water. The process was followed by 60 min at room temperature. ZnO sol as a first layer is first deposited on a glass substrate and then proceed TiO2 sol on it, for the both deposition was heated at 450oC. The optical properties of ZnO/TiO2 bilayer thin films was characterized by using spectrophotometer UV-Vis. The results showed that the molarity of the ZnO sol affects the optical properties of ZnO/TiO2 bilayer thin films. The band gap energy of the ZnO/TiO2 bilayer thin films with different molarity of ZnO sol respectively 0,1 M, 0,3 M, 0,5 M and 0,7 M has been measured about 3,21 eV, 3,27 eV, 3,32 eV and 3,36 eV. The results of the photodegradation test of the ZnO/TiO2 bilayer thin films have been able degrade methylene blue up to 99,85%, methyl orange 50,68% and batik's dye 49,87%

Pengaruh Pemberian Jahe Merah (Zingiber Officinale Var Rubrum) Terhadap Kadar Kolesterol Ldl Wanita Dislipidemia

LatarBelakang: Peningkatan kadar kolesterol LDL meningkatkan risiko terjadinya penyakit kardiovaskuler. Jahe merah, yang banyak dikonsumsi sebagai bumbu, sudah digunakan sebagai pengobatan herbal tradisional. Jahe merah merupakan bahan makanan alternative yang mengandung flavonoid yang dapat menurunkan kadar kolesterol LDL. Penelitian ini bertujuan untuk menganalisis pengaruh pemberian jahe merah terhadap kadar kolesterol LDL pada wanita dislipidemia.Metoda: Penelitian true experimental dengan pre-post test control group diterapkan pada 34 wanita dislipidemia dengan kadar kolesterol LDL lebih dari 100 mg/dl sampai 159 mg/dl yang dikelompokkan menggunakan sistem acak sederhana menjadi 1 kelompok perlakuan dan 1 kelompok kontrol. Subjek diberikan minuman jahe merah dengan dosis 3,2 ml/kg berat badan selama 21 hari. Kadar kolesterol LDL ditentukan melalui metode langsung (direct homogenous enzymatic method) setelah subjek berpuasa selama 10 jam. Uji normalitas menggunakan Shapiro-Wilk. Data dianalisis dengan dependent t-test, independent t-test, Mann-Whitney, uji Pearson, dan uji Spearman pada tingkat kepercayaan 95%.Hasil: Pemberian jahe merah dapat menurunkan kadar kolesterol LDL pada kelompok perlakuan sebesar 12,75%.Kesimpulan: Pemberian jahe merah dengan dosis 3,2 ml/kg berat badan selama 21 hari dapat menurunkan kadar kolesterol LDL secara signifikan padawanitadislipidemia