The full likelihood approach in statistical analysis is regarded as the most efficient means for estimation and inference. For complex length-biased failure time data, computational algorithms and theoretical properties are not readily available, especially when a likelihood function involves...

When estimating the marginal mean response with missing observations, a critical issue is robustness to model misspecification. In this article, we propose a semiparametric estimation method with extended double robustness that attains the optimal efficiency under less stringent requirement for...

Based on the current situation of ecological environment of agriculture in Tianjin City, we divide the ecological service function of urban modern agriculture in Tianjin City into seven types: air regulation, climate regulation, water conservation, soil formation and protection, waste disposal,...