• Journal of the Korean Data and Information Science Society
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• v.15 no.2
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• pp.379-386
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• 2004

This paper deals with a mixed logit model for vaccination data. The effect of a newly developed vaccine for a certain chicken disease can be evaluated by a noninfection rate after injecting chicken with the disease vaccine. But there are a lot of factors that might affect the noninfecton rate. Some of these are fixed and others are random. Random factors are sometimes coming from the sampling scheme for choosing experimental units. This paper suggests a mixed model when some fixed factors need to have different experimental sizes by an experimental design and illustrates how to estimate parameters in a suggested model.

• Korean Journal of Veterinary Service
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• v.15 no.1
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• pp.17-25
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• 1992

For evaluation on effects guiding fasciola prevention of which the specimens collected from 6,011 cows rears at 387 farms in inchon were tested to egg count examination for 4 years(1987-1990), and the questionnaire checked up 181 dairy farms for 2 years (1989-1990). The results were summarized as follows. 1. A yearly variation of fasciola infection rate above 31% were 83% In 1987, 58% in 1988, 25% in 1989, noninfection in 1990. 2. The average concentration in feces of infected dairy cattle was 79.4% below 1-10 eggs for 4 years(1987-1990) 3. In the results of the questionnaire for 2 years(1989-1990) the farmers gradually took interest in fasciola prevention. 4. To re-dose anthelmintics was 75.4% in 1989 and 82.5% in 1990 after 5∼7 months from previous dosage.