In cancer clinical trials and other medical studies, both longitudinal measurements and data on a time to an event(survival time) are often collected from the same patients. Joint analyses of these data would improve ...In cancer clinical trials and other medical studies, both longitudinal measurements and data on a time to an event(survival time) are often collected from the same patients. Joint analyses of these data would improve the efficiency of the statistical inferences. We propose a new joint model for the longitudinal proportional measurements which are restricted in a finite interval and survival times with a potential cure fraction. A penalized joint likelihood is derived based on the Laplace approximation and a semiparametric procedure based on this likelihood is developed to estimate the parameters in the joint model. A simulation study is performed to evaluate the statistical properties of the proposed procedures. The proposed model is applied to data from a clinical trial on early breast cancer.展开更多
采用超支化聚酯Boltorn H 20与丁二酸酐反应,制备了亲水性超支化聚酯,然后与甲基丙烯酸酯基改性的聚醚基聚氨酯预聚体和3-异氰酸酯基丙基三乙氧基硅烷(IPTS)反应,合成了有机硅烷偶联剂改性紫外光固化聚醚基超支化水性聚氨酯(WHPU)。考...采用超支化聚酯Boltorn H 20与丁二酸酐反应,制备了亲水性超支化聚酯,然后与甲基丙烯酸酯基改性的聚醚基聚氨酯预聚体和3-异氰酸酯基丙基三乙氧基硅烷(IPTS)反应,合成了有机硅烷偶联剂改性紫外光固化聚醚基超支化水性聚氨酯(WHPU)。考察了有机硅烷偶联剂用量对WHPU的耐酸性、固化时间、凝胶质量分数、附着力、水接触角、水吸附率、乳液粒径分布及热稳定性的影响。结果表明,当IPTS与Boltorn H 20中羟基的摩尔比为6/16时,固化后的WHPU膜的凝胶质量分数为92%,在玻璃表面的附着力达到0级;与不含有机硅烷偶联剂的WHPU相比,该涂膜的水接触角和热稳定性分别提高了34°和22℃,其吸水率从13.8%降低到4.3%。展开更多
基金supported by the Fundamental Research Funds for the Central Universities of ChinaNational Natural Science Foundation of China (Grant No. 11601060)+1 种基金Dalian High Level Talent Innovation Programme (Grant No.2015R051)Research Grants from Natural Sciences and Engineering Research Council of Canada
文摘In cancer clinical trials and other medical studies, both longitudinal measurements and data on a time to an event(survival time) are often collected from the same patients. Joint analyses of these data would improve the efficiency of the statistical inferences. We propose a new joint model for the longitudinal proportional measurements which are restricted in a finite interval and survival times with a potential cure fraction. A penalized joint likelihood is derived based on the Laplace approximation and a semiparametric procedure based on this likelihood is developed to estimate the parameters in the joint model. A simulation study is performed to evaluate the statistical properties of the proposed procedures. The proposed model is applied to data from a clinical trial on early breast cancer.
文摘采用超支化聚酯Boltorn H 20与丁二酸酐反应,制备了亲水性超支化聚酯,然后与甲基丙烯酸酯基改性的聚醚基聚氨酯预聚体和3-异氰酸酯基丙基三乙氧基硅烷(IPTS)反应,合成了有机硅烷偶联剂改性紫外光固化聚醚基超支化水性聚氨酯(WHPU)。考察了有机硅烷偶联剂用量对WHPU的耐酸性、固化时间、凝胶质量分数、附着力、水接触角、水吸附率、乳液粒径分布及热稳定性的影响。结果表明,当IPTS与Boltorn H 20中羟基的摩尔比为6/16时,固化后的WHPU膜的凝胶质量分数为92%,在玻璃表面的附着力达到0级;与不含有机硅烷偶联剂的WHPU相比,该涂膜的水接触角和热稳定性分别提高了34°和22℃,其吸水率从13.8%降低到4.3%。
