期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
EM算法对缺失数据极大似然估计的实证研究 被引量:3
1
作者 黎镭 陈蔼祥 姚赞杰 《统计学与应用》 2018年第2期210-220,共11页
用EM方法对缺失数据进行极大似然估计是处理缺失数据的一种基本方法。 本文在介绍基于EM的极大似然估计方法基础上,对一类随机缺失数据集用EM方法进行补齐,结果表明在10%、20%、30%三种不同缺失率下,EM方法进行缺失数据补齐的相对误差... 用EM方法对缺失数据进行极大似然估计是处理缺失数据的一种基本方法。 本文在介绍基于EM的极大似然估计方法基础上,对一类随机缺失数据集用EM方法进行补齐,结果表明在10%、20%、30%三种不同缺失率下,EM方法进行缺失数据补齐的相对误差均小于0.1,呈现出低缺失率情况下的高准确性的特点。进一步将EM方法应用于对实际问卷调查中的缺失数据进行补齐,对补齐前后调查结果的影响进行了分析。 展开更多
关键词 EM算法 极大似然估计 缺失数据 随机缺失
在线阅读 下载PDF
A first-order coalition logic for BDI-agents
2
作者 Qingliang chen Kaile SU +2 位作者 Abdul SATTAR Xiangyu LUO aixiang chen 《Frontiers of Computer Science》 SCIE EI CSCD 2016年第2期233-245,共13页
Coalition logic (CL) enables us to model the strategic abilities and specify what a group of agents can achieve whatever the other agents do. However, some rational mental attitudes of the agents are beyond the scop... Coalition logic (CL) enables us to model the strategic abilities and specify what a group of agents can achieve whatever the other agents do. However, some rational mental attitudes of the agents are beyond the scope of CL such as the prestigious beliefs, desires and intentions (BDI) which is an interesting and useful epistemic notion and has spawned substantial amount of studies in multi-agent systems. In this paper, we introduce a first-order coalition BDI (FCBDI) logic for multi-agent systems, which provides a semantic glue that allows the formal embedding and interaction of BDI, coalition and temporal operators in a first-order language. We further introduce a semantic model based on the interpreted system model and present an axiomatic system that is proved sound and complete with respect to the semantics. Finally, it is shown that the computational complexity of its model checking in finite structures is PSPACE-complete. 展开更多
关键词 coalition logic BDI logic complete axiomatization computational complexity
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部