Judul: Pengaruh Pencilan Pada Pohon Regresi
Abstrak: Metode paIlon regresi adalah salah satu metode klasiftkasi yang memiliki peubah respon kontinu yang berlandaskan pada penguraian keragaman peubah respon. Jib ada amatan pencilan pada peuhah respon maka peubah penjelas tersebut menjadi sensitif. Selain pabon regresi masih ada teknik-teknik segmentasi yang lain, salah satunya adaJah regrc:si bertaIar. dimana proses penyeleksian peubah-peubah penjelas yang berpengaruh terhadap peubah respon dilakukan secara bertahap.
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Judul: Penerapan Metode Pohon Regresi Dan Prosedur Regresi Bertatar Untuk Segmentasi Data
Abstrak: Metode regresi berstruktur pohon merupakan suatu teknik statistika dependence methods yang penggunaannya untuk segmentasi akhir-akhir ini semakin lnas. Cara kerja dari metode pohon regresi ini hampir serupa dengan prosedur regresi bertatar, dimana proses penyeleksian peubah-peubah penjelas yang berpengaruh terhadap penbah respon dilakukan secara bertahap. Salah satu perbedaan dari kedua metode ini adalah bahwa analisis regresi bertatar dalam setiap tahapnya tidak melakukan pemilahan terhadap data berdasarkan peubah yang muncui pada tahap tersebut, sehingga analisis ini tidak memberikan informasi yang berarti untuk segmentasi data. Namun demikian, analisis regresi bertatar dalam setiap tahapnya dilengkapi dengan suatu persamaan regresi, dimana hal ini penting artinya untuk mengetahui sejauh mana keterkaltan struktural antara peubahpeubah penjelas terhadap peubah respon, dan hal ini tidak bisa didapatkan melalui metode pohon regresi.
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Judul: Biology and ecology of the buffalo fly, haematobia exigua de meijere (diptera:muscidae)
Abstrak: The life history of the buffalo fly was observed at room temperature of 27°-29.5°C and at a relative humidity of 48-68 percent. The eggs hatched after 17-22 hours, with an average of 18 hours. First instar larvae measured 1.25 + 0.16 mm long and 0.27 + 0.037 mm wide. reach the second larval stage. It took 6-12 hours to the second instar larvae measured 2.676 +0.187 mm long and 0.353 +0.028 mm wide. The second instar took about 12-24 hours to reach the third larval stage. The third instar measured 6.833 + 0.189 mm long and 0.919 + 0.051 mm wide. It took about 2-3 days for the third instar to become pupae. Duration of the pupal stage was about 5-7 days before the adults emerged. Under laboratory condition, the buffalo fly completed its life cycle in 9.5 to 10.5 days, whereas under field condition it took 9-14 days with an average of 10.5 days. The growth ratio which was based on the measurements of the cephalo-pharyngeal skeleton of each instar was 1.797. The preoviposition period was 8-12 days and mating usually occurred on the 6th or 7th day. The longevity of the male was 29 days, whereas it was 32 days in the female. The range of egg production under laboratory condition was between 20-139 per female fly. The belly and hind legs of the carabao were the most preferred habitat either during cloudy and cool dry or shiny and warm day. When the weather was clear and the carabao was in the shade, the flies tended to be more distributed particularly on the shoulder, dewlap, back and horns. The carabaos had relatively fewer Musca sp. and Stomoxys calcitrans than cattle; never the less carabaos had a higher infestation of buffalo fly than cattle. Oviposition occured either during the day or night but the buffalo flies were more active during the night than in the day time. The effect of various lengths of exposure time of manure in relation to the oviposition was profound. observed, the maximum number of the buffalo flies was occurred when the dung was exposed for 30 minutes. With increasing time of exposure the number and variety of insects also increase. It was evident that Sepsidae and psychodidae were the most dominant insects emerging from the dung. The number of buffalo flies also increased with increasing
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