Judul: Metode analisis kanonik semiparametrik untuk peubah-peubah yang memiliki hubungan non-linear
Abstrak: Analisis Korelasi Kanonik (AKK) digunakan untuk menganalisis hubungan linear antar dua gugus peubah. Namun dalam beberapa kasus, hubungan antar dua gugus peubah bersifat non-linear. Oleh karena itu Yingcun Xia (2008) memperkenalkan metode baru yaitu Analisis Kanonik Semiparametrik (AKS). AKS melakukan pendugaan koefisien komponen kanonik dengan pemulusan polinomial lokal dan uji signifikansi komponen AKS dengan pendekatan model indeks tunggal berdasarkan validasi silang. Sedangkan pendugaan koefisien komponen kanonik pada AKK dengan menggunakan Cauchy-Schwarz atau metode langrange. Pada penelitian ini dilakukan simulasi untuk membandingkan hasil AKK dan AKS pada data yang memiliki hubungan non-linear antar dua gugus peubah. Hal yang dibandingkan dalam simulasi adalah jumlah komponen kanonik yang signifikan antara AKK dan AKS. Semakin banyak komponen kanonik yang signifikan maka semakin baik metode tersebut dibandingkan metode lainnya. Kedua metode tersebut dievaluasi dengan melihat nilai p dari uji wilk’s lambda untuk AKK dan nilai single cross prediction untuk AKS. Hasil simulasi menunjukkan bahwa AKS lebih unggul dibandingkan dengan AKK untuk menganalisis hubungan non-linear antar dua gugus peubah. Hal ini dikarenakan AKS menggunakan pendekatan parametrik dan nonparametrik sehingga jumlah komponen kanonik yang signifikan pada AKS lebih banyak daripada AKK. Pada AKK, semakin besar ukuran sampel maka nilai analisis korelasinya cenderung menurun dan jumlah komponen kanonik yang signifikan juga cenderung tetap. Sedangkan pada AKS, semakin besar ukuran contoh maka semakin besar jumlah komponen kanonik yang signifikan.
Keyword: CCA, SCA, Simulation, Wilks lambda test, Single cross prediction, Bogor Agricultural University, Institut Pertanian Bogor, IPB

Judul: Perbandingan Metode Kekar Biweight Midcovariance dan Minimum Covariance Determinant dalam Analisis Korelasi Kanonik
Abstrak: Canonical Correlation Analysis (CCA) is a multivariate linear used to identify and quantify associations between two sets of random variables. Its standard computation is based on sample covariance matrices, which are however very sensitive to outlying observations. The robust methods are needed. There are two robust methods, i.e robust Biweight Midcovariance (BICOV) and Minimum Covariance Determinant (MCD) methods. The objective of this research is to compare the performance of both methods based on mean square error. The data simulations are generated from various conditions. The variation data consists of the proportion of outliers, and the kind of outliers: shift, scale, and radial outlier. The performance of robust BICOV method in CCA is the best compared to MCD and Classic.
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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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