Judul: Regresi Komponen Utama Pengaruh Sifat-Sifat Kuantitatif Padi Sawah Terhadap Hasil
Abstrak: Penelitian ini bertujuan untuk mencari model regresi dan menduga pengaruh sifat-sifat kuantitatif padi sawah terhadap hasil. Terjadinya korelasi yang cukup tinggi diantara peubah bebas (multikolinearitas) menyebabkan penggunaan regresi linear menjadi tidak tepat lagi. Salah satn metode untnk mengatasi adalall menggunakan regresi komponen utama.
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Judul: Studi Pemilihan Komponen pada Regresi Komponen Utama
Abstrak: Penelitian ini bertujuan untuk mencari suatu pola tertentu dalam menentukan komponen-komponen utama mana yang sebaiknya diikutsertakan dalam persamaan regresi.Dari hasil yang diperoleh dapat dilihat bahwa masuknya komponen utama dalam persamaan regresi tidak semata-mata berdasarkan akar ciri terbesar/ragam terbesar , melainkan ada kecenderungan berdasarkan kombinasi linear dari beberapa akar clri atau indeks kondisi / bilangan kondisi.Jadi akar ciri dan indeks kondisi/bilangan kondisi mempunyai peranan yang sangat penting dalam menentukan komponen-komponen utama yang mana yang sebaiknya akan dimasukkan dalam persamaan regresi.Sewaktu pola pemilihan komponen utama yang diperoleh diterapkan pada 2 (dua) teladan dibidang sasial ekonomi pertanian,setelah dianalisis ternyata diperoleh hasil yang cukup memuaskan.
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Judul: Distribution and Diversity of Ectoparasite Mites on Geckos in Indonesia
Abstrak: Data on the diversity and dispersal of parasitic mites on house geckos in Indonesia are very scarce. In this work, the distribution and diversity of mites living on three species of house geckos, namely Cosymbotus platyurus, Hemidactylus frenatus, and H. garnotii collected throughout Indonesia, has been elaborated. Geckos and mites were captured and immediately preserved in 70% ethanol. Whole mount of the mites was prepared by clearing in lactophenol followed by mounting on polyvinyl lactophenol solutions. The SEM preparation was conducted to examine the detail morphological characters of the mites. The results showed that among 448 individuals of geckos, 221 geckos were infected by Geckobia mites. Prevalences of C. platyurus, H. frenatus, and H. garnotii infested by mites were 14.8%, 50.69%, and 79.6%, respectively. Three different spesies of Geckobia (G1, G2, and G3) could be differentiated; and based on similarities of their morphological characters to ones described in published literatures, Geckobia G2 is Geckobia glebosum and Geckobia G3 is Geckobia bataviensis while G1 could not be identified to the species level. The highest mean intensity of Geckobia G1 infestation was found on H. garnotii (I=7.0), G. glebosum infestation on H. frenatus (I=3.5), and G. bataviensis infestation on H. garnotii (I=11.8). In general, C. platyurus was infested by the least number of mites. Geckobia G1 were found living on the skin folds on the claws, G. glebosum were found mainly on the body and thigh, and G. bataviensis were found on almost all parts of the host’s body. Geckobia mites are distributed randomly throughout Indonesian Archipelago, following the pattern of distribution of their hosts. So it is concluded that Geckobia G1, G. glebosum, and G. bataviensis are sympatric.
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