Applications of discrete-time survival analysis to iological control data

This thesis uses the Discrete-Time Survival model to analyze the biological control data. The data was provided by Biological Control Laboratory, Department of Plant Protection, National PingTung University of Science & Technology. In the experiment , three kinds of Rhizoctonia solani Ktihn( R1, R2 and R3 respectively), and seven Trichoderma spp. (T1-T7) were used. The main purpose is to determine which Trichoderma spp. would best restrain the propagation of Rhizoctonia solani Ktihn.hen event times are highly discrete due to a problem known as “ties”, the Discrete-Time Survival model is suitable to analyze the data. By constructing the models, plotting the hazard functions and survival functions, we can know the effects of different Trichoderma spp. that restrain the propagation of Rhizoctonia solani Ktihn. Moreover, this thesis discusses the alternative specification of time and the effect of using another link function. In addition, we also check the assumptions of the model. Finally, the results are also compared with those obtained by Chan(2003) and Lin(2007).