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Which graphical models are difficult to learn?
Ising model binary markov random field markov random
2015/8/21
We consider the problem of learning the structure of Ising models (pairwise binary Markov random fields) from i.i.d. samples. While several methods have been proposed to accomplish this task, their re...
The Effect of Missing Data Treatment on Mantel-Haenszel DIF Detection
Missing Data Mantel-Haenszel DIF Detection
2015/7/2
Most implementations of the Mantel-Haenszel differential item functioning procedure
delete records with missing responses or replace missing responses with scores of 0. These
treatments of missing d...
XerCD/dif位点特异性重组
XerCD dif 位点特异性重组
2013/7/22
大约10%~15%的大肠杆菌在染色体复制过程中会形成染色体二聚体。大肠杆菌染色体编码的重组酶XerC和XerD作用于染色体复制终点区的dif序列, 以同源重组的方式将染色体二聚体解离为单体, 使细菌得以正常复制分裂。编码霍乱毒素的噬菌体CTXΦ以位点特异的方式整合入霍乱弧菌染色体, 但其基因组中不含有任何重组酶基因, 其整合过程需要细菌染色体编码的XerC和XerD重组酶, 且整合位点与大肠杆菌d...
The distribution of separations of wide binaries of dif- Ferent ages
binaries dif- Ferent ages
2009/6/16
The distribution of separations of wide binaries of dif- Ferent ages。
Occurrences and sources of Differential Item Functioning (DIF) in patient-reported outcome measures: Description of DIF methods,and review of measures of depression,quality of life and general health
Differential Item Functioning (DIF) measurement equivalence patient-reported outcomes
2009/12/18
Examination of the equivalence of measures involves several levels, including conceptual equivalence of meaning, as well as quantitative tests of differential item functioning (DIF). The purpose of th...
Investigating DIF and extensions using an LLTM approach and also an individual differences approach:an international testing context
DIF LLTM differential facet functioning (DFF) multidimensional model PISA
2009/12/21
This study intends to investigate two ways to generalise differential item functioning (DIF) by grouping of items that share a common feature, or an item property as in the Linear Logistic Test Model ...