Judul: Pendugaan kestabilan rating program televisi dengan rantai markov waktu kontinu tidak homogen
Abstrak: Televisi merupakan media yang paling banyak digunakan untuk memasang iklan. Hal ini disebabkan televisi sebagai salah satu sarana hiburan yang dapat dijangkau berbagai lapisan masyarakat. Jika ingin memasang iklan di televisi pemasang iklan akan mengeluarkan biaya yang sangat mahal. Oleh karena itu pemasang iklan memerlukan strategi agar target penonton yang diinginkan tercapai. Salah satu strategi yang perlu diperhatikan adalah pemilihan program yang akan dijadikan tempat penayangan iklan. Program televisi yang dipilih adalah program yang ratingnya stabil. Pada penelitian ini, peneliti menerapkan rantai Markov waktu kontinu tidak homogen untuk menduga kestabilan rating program televisi, dengan rantai Markov waktu kontinu tidak homogen akan diduga probabilitas transisi dari satu state ke state lainnya, sehingga akan terbentuk satu matriks probabilitas transisi. Sebanyak 52% program yang diamati diduga akan stabil selama dua bulan setelah pengamatan. Pendugaan dengan rantai Markov waktu kontinu tidak homogen dapat dikatakan baik karena ketepatan pendugaannya mencapai 67%.
Keyword: Rating, Matriks, Probabitas transisi, Rantai Markov waktu kontinu tidak homogen, Bogor Agricultural University, Institut Pertanian Bogor, IPB

Judul: The application of cluster and biplot analyssis for television program rating data
Abstrak: Television is one of the greatest inventions in 20th century. It can provide people with the actual news and information and also at the same time give them entertainment. The television industry has grown rapidly in the past 15 years since the government permits the establishment of commercial TV stations. As the medium of information, television has become the main choice for companies to advertise their products. Since there are eleven TV stations in Indonesia, advertisers have to make plan and strategy to broadcast the advertisement. Through proper statistical analysis, the information about which TV station should be chosen and when to broadcast the advertisement can be obtained. Data used in this study was secondary data from Nielsen Media Index from February 1-29th 2004, which was subscribed by Hotline Advertising. The data contains television rating for every programs that was broadcasted by eleven TV stations on February 2004. The results from cluster analysis on February 2004 categorize the eleventh TV stations into five groups/clusters. Each cluster has their own characteristics that are very useful for the advertisers. By constructing biplot, the information of strategic time on every day for each TV station can be obtained. The results from the biplot were suitable to explain the conditions that occur on February.
Keyword: cluster and biplot analysis, television, rating

Judul: Lejeuneaceae Subfamily Ptychanthoideae (Hepaticae) in  West Java
Abstrak: Subfamily Ptychanthoideae of the family Lejeuneaceae (Hepaticae) in West Java is still poorly known. Publications on this subfamily are out of dated and written in the 19th or early of 20th century. The last taxonomic treatment of Ptychanthoideae of West Java was in 1933, many species names have changed since then. Studies on Ptychanthoideae of West Java are urgently needed. Studies on the Ptychanthoideae were based on the specimens collected from West Java. A total number of 361 of specimens deposited in the Herbarium Bogoriense (BO), Herbarium Biotrop (BIOT), Gottingen Herbarium (GOET) and Bangi Herbarium (UKMB) were examined, those are old and several recent specimens collected in West Java. Recent collections were made from Telaga Warna, Ciater, Gunung Halimun Salak National Park, Cibodas Botanical Garden, Bodogol Education Center and Conservation (Gunung Gede Pangrango National Park), University of Indonesia Campus Depok, including several collections from Banten Province. Twenty four species of Lejeuneaceae subfamily Ptychanthoideae are known from West Java, belonging to 8 genera namely Acrolejeunea (Spruce) Schiffn. (2 species), Archilejeunea (Spruce) Schiffn. (1 species), Lopholejeunea (Spruce) Schiffn. (10 species), Mastigolejeunea (Spruce) Schiffn. (3 species), Ptychanthus Nees (1 species), Schiffneriolejeunea Verd. (1 species), Spruceanthus Verd. (2 species) and Thysananthus Lindenb. (4 species). Two new records of Ptychanthoideae: Mastigolejeunea indica Steph. and Thysananthus minor Verdoorn are reported for Java. A determination key to the species is presented including their descriptions and illustrations.
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