Judul: Applying Hidden Logit Model with Randomized Response (Case Study
Abstrak: In 1965 Stanley Warner (Fox & Tracy, 1986) pioneered the randomized response technique to reduce bias response caused by respondents who lied, or did not answer the question given by the interviewer to estimate the sensitive characteristics. Warner model directing respondents to answer either of two sensitive opposite questions. Warner model still has weaknesses, then Simmons (Fox & Tracy, 1986) develops a randomized response technique of Warner model by replacing one question with a question that not associated with the sensitive issues at all (unrelated question model). According to Stem & Steinhorst (Fox & Tracy, 1986) unrelated question model still has weaknesses too and then developed into a forced response model. Maddala (1983) pioneered the development of sensitive attributes in the randomized response technique as a binary response variable associated with several explanatory variables. This development adopts logistic regression to estimate its parameters. Since π* is the population proportion that have sensitive attributes that can not be predicted directly, but estimated by π, Corstange (2004) named this prediction method with hidden logit estimation. This research aimed to find factors that affect a student accessing porn sites. This research obtain that proportion estimator of the population that accessing porn sites is 24%. Variables that significantly influence a student to access pornographic websites such as gender, maternal education, ownership of the laptop and how to connect to the internet. This research also needs to be developed again primarily related to response variables that have more than two categories (multinomial) such as issues about the type of drugs consumed, how many times had an abortion in a population of prostitutes and so on.
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Judul: Logistic Regression Model Studies on Case-Control Data with Three-Stage Sampling
Abstrak: If the sample is taken by using multistage random sampling, through reducing sample size in the next stage, then the ordinary logistic models can’t be used. This data will be analyzed using logistic models with the additional intercept. This research studied the application of addition intercept terms in logistic regression for case control study used multi stage random sampling. Furthermore, this research compared between the model which was formed and the model of the frame sampling data. The addition intercept in logistic models was able to describe the pattern of relationship explanatory variable with response variable. Missing information decreases with increasing number of samples that observed. Average of missing information in the third stage tends to be smaller than in the second stage, because the third stage has more homogeneous sample units than the second stage. The average of missing information is smaller than the average reduction in the number of samples when using multi-stage random sampling, so this sampling technique is also suitable for use in research aimed at predicting the probability of case. Moreover the use of the sampling technique can reduce the sampling cost.
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Judul: Budidaya bunga krisan potong (dendranthema grandiflora tzvelev) di PT. Alam Indah Bunga Nusantara, Cipanas Cianjur Jawa Barat
Abstrak: Kegiatan magang ini dilakukan untuk memperluas wawasan dan meningkatkan pengetahuan mengenai budidaya bunga krisan potong sampai pada egiatan pemasarannya. Pelaksanaan magang dilakukan di PT. Alam Indah Bunga Nusantara (AIBN), Cipanas, kabupaten Cianjur, Jawa Barat. Magang ini ilaksanakan selama empat bulan dimulai pada tanggal 5 Februari 2003 sampai 5 uni 2003. Metode yang di gunakan adalah dengan mengikuti seluruh rangkaian egiatan yang dilaksanakan di perusahaan mulai dari teknik budidaya, Denanganan pasca panen, sampai dengan pemasarannya. Pengumpulan data dan nformasi dilakukan dengan metode langsung dan metode tidak langsung. Data primer diperoleh melalui pengamatan dan pencatatan langsung di perusahaan erkait, sedangkan data sekunder diperoleh dari studi pustaka. Hasil kegiatan magang ini menujukkan bahwa PT. Alam Indah Bunga Nusantara merupakan suatu perusahaan agribisnis dengan krisan potong sebagai komoditas utamanya. Varietas bunga krisan yang ditanam adalah tipe spray dan tipe standar. Tipe spray terdiri dari town talk, white regent,royal regent, stroika, uma dan yellow puma, sedangkan untuk tipe standar terdiri dari yellow fiji, white fiji, dark fiji, shena dan revert. Umur panen tanaman krisan berkisar antara 12 minggu sampai dengan 14 minggu. Kegiatan budidaya tanaman krisan dilakukan di rumah plastik yang dilengkapi dengan sarana pendukung lainnya seperti exhaust fan, drip irrigation, overhead irrigation dan sarana penyinaran. Kegiatan budidaya dimulai dari tempat pembibitan yaitu pengambilan stek pucuk dari mother stock plant (tanaman induk), kemudian ke nursery yaitu tempat penanaman stek yang akan menghasilkan bibit yang berkualitas yang akan ditanam di lahan untuk produksi. Kegiatan budidaya yang terakhir yaitu kegiatan di lahan produksi yang akan
Keyword: Bunga krisan potong, Dendranthema grandiflora tzvelev