Judul: Simulation study about the influence of multicollinearity to the first principal component and applications
Abstrak: Simulasi dengan menggunakan model sederhana mampu membangkitakan data yang berkorleasi anatar peubah sesuai dengan yang dikehendaki. Sehingga keterbatasan software satatistika untuk membangkitkan data yang bermultikolinear tertentu bisa diatasi dengan simulasi. Prosedur penilaian huruf mutu yang umum dipakai didalam kegiatan akademik Institut Pertanian Bogor adalah Pola Acuan Normal dan Pola Acuan Pokok temyata kurang memperhatikan pengaruh korelasi antar peubah ujian dan keragaman pada setiap peubah ujian. Korelasi antar peubah ujian menunjukan kekonsistensian mahasiswa dalam menghadapi ujian, sedangkan keragaman menunjukan tingkat kemampauan peserta mahasiswa dalam menghadapi ujian tersebut. Metode penilaian dengan menggunakan komponen utama mengakomodasi keragaman peubah dan korelasi antar peubali Jika korelasi antar peubah besar maka peubah-peubah tersebut akan tereduksi dimensinya menjadi satu dimensi yaitu komponen utama pertama. Selanjutnya skor komponen utama pertama inilah yang akan menjadi dasar penilaian. Skor komponen utama pertama tepat menjadi dasar penilaian untuk data yang berkolerasi positif maupun negatif sedangkan untuk data yang tidak berkorelasi cenderung menggunakan peubah yang keragamannya terbesar sebagai dasar penilaian.
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Judul: Metode Regresi Komponen Utama, Regresi Kuadrat Terkecil Parsial, dan LASSO pada Data Kemiskinan Hasil Olahan Susenas 2012
Abstrak: Multicollinearity is a problem that is arise in multiple linear regression. Multicollinearity lead testing and estimating coefficient regression models become invalid because it produces a large variety. Methods that can be used to overcome multicollinearity in the data in among these are PCR, PLS, and LASSO. PCR and PLS forming independent new components to overcome multicollinearity. Both method previously unable to do the screening variables. LASSO does the screening variables by shrinking appropriate coefficient value of zero. The result showed the best model of the three based on RMSE value produced by LASSO method, and based on RMSEP value produced by RKU method. Difference in value of error for the three method are not much different.
Keyword: Bogor Agricultural University (IPB), PLS, PCR, Multicollinearity, LASSO

Judul: Elektrodeposisi Film Tipis Semikonduktor Cu2ZnSnS4 (CZTS) pada Substrat Kaca ITO
Abstrak: Semiconductor Cu2ZnSnS4 (CZTS) thin film that can be used as absorber layers on solar cell module was made via electrodeposition method. CZTS thin film was electrodeposited on the surface of a silicate glass coated with a thin layer of indium tin oxide (ITO). Deposition process was done using potentiostatic mode at room temperature with a potential of 1.05 V for 30, 45, and 60 minutes, followed with annealing the film at 2 different temperatures, 500 ºC using furnace and 180 ºC using hot plate, both treatments for 45 minutes in N2/H2S atmosphere. The X-ray difractograms were analyzed using Match 2 program and showed that the CZTS thin films had kesterit crystalline structure, with a low percentage of CZTS phase. The thin film also contained secondary phases such as Cu2S, ZnS, and SnS. The obtained CZTS thin films had a thickness between 1.039 and 1.676 μm. Absorption study showed that the band gap energy of CZTS thin films which was annealed using furnace ranged from 1.50 to 1.52 eV, whereas that annealed using the hot plate was not observed. The band gap energy value showed that CZTS thin films can be used as sunlight absorber layers on solar cell. The formation of CZTS crystal film on this investigation was effectively performed using furnace annealing process at a temperature of 500 ºC with deposition time of 45 minutes.
Keyword: Thin film, Electrodeposition, Cu2ZnSnS4