Judul: Metode kuadrat terkecil pada analisis data dengan ulangan dan ukuran subsampling tidak sama
Abstrak: Penelitian ini bersumber dari percobaan yang dilakukan oleh seorang mahasiswa program S3 IPB dalam mempelajari pengaruh pemberian 3 taraf protein dan 3 taraf yodium pada kambing induk, serta diamati pula pengaruhnya pada kambing anak yang dilahirkannya. Pada penelitian ini terutama membahas aspek-aspek statistika yang timbul akibat keadaan struktur data pada percobaan tersebut, dimana banyaknya ulangan dan ukuran subsampling yang tidak sama besar. Permasalahan yang timbul adalah dalam penentuan nilai harapan kuadrat tengah perlakuan, penguraian jumlah kuadrat dalam analisis regresi polinomial ortogonal, dan statistik uji yang digunakan untuk menguji hipotesis linear. Untuk penentuan nilai harapan kuadrat tengah, diperkenalkan metode Doolittle dipersingkat, yang sangat berguna jika unit pengamatan dalam percobaan tidak sama. Kemudian dalam analisis regresi polinomial ortogonal, diperkenalkan metode pengortogonalan matriks dengan metode pengortogonalan Gram-Schmidt yang dapat digunakan secara umum. ...
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Judul: Perbandingan metode regresi kuadrat terkecil dengan metode kekar
Abstrak: Ordinary least squares method is generally used to estimate parameter of a linear model. However, ordinary least squares is vulnerable against outliers because this method treats every element of data with equal weight. To overcome this problem, several studies have been done to find methods that produce more robust estimator. The robust methods being studied in this paper are weighted least squares, least absolute deviations, least median squares, and least trimmed squares methods. The comparison among those methods indicates that the method of least absolute deviation and weighted least squares are more resistant in case of the presence of outliers in the dependent variable. Meanwhile, least median squares and least trimmed squares methods are resistant to the presence of outliers both in the dependent and independent variable.
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Judul: Studi Kelayakan Pendirian Pabrik Minyak Daun Cengkeh (Eugenia aromatica) di Kabupaten Halmahera Barat.
Abstrak: Clove leaf oil is an essential oil which derived from clove leaf. Clove leaf oil is used as a raw material by the industry because of the high content of eugenol. This research aims to provide an overview of information and feasibility of establishment clove leaf oil factory. The method used is the method of investment feasibility analysis. Market demand of clove oil higher than its supply. The capacity of clove leaf oil factory planned 2 tons of dried clove leaf/day, location in District Jailolo, West Halmahera. Investment required is about 722 million rupiah and working capital is about 165 million rupiah. Investment criteria indicates the value of Net Present Value is Rp 586 milion, IRR 20%, B/C Ratio 1.71, and Pay Back Period is 4 years and 3 months. Break-even point is reached when the sale of clove oil as much as 13 tons. The sensitivity analysis shows that the industry is feasible when the maximum decrease in production capacity is 6,85%, the maximum decrease of selling price is 4,1%, and the maximum increase purchase price of leaf clovers is 16,3%. Based on the results of research, the clove leaf oil factory is feasible for built in West Halmahera.
Keyword: Clove leaf oil, essential oil, feasibility studies, west halmahera