Family patterns and child abuse in a nationally representative American sample

Data on 1, 146 families with a child age 3 through 17 at home are presented. Child abuse information was obtained for a randomly selected child in each family. Child abuse was defined as an attack by a parent involving punching, kicking, biting, hitting with an object, “beating up,” or using a knife or gun. Over 14 out of every 100 American children 3–17 are subjected to abusive violence each year. These figures are at least 26 times greater than those of the National Center For Child Abuse and Neglect. Even so, for reasons outlined in the paper, they are underestimates. Families in which child abuse occurred are compared with other families. The results suggest that child abuse is brought about by the very nature of the society and its family system. This has profound implications for the prevention and treatment of child abuse. Although psychotherapy may be appropriate in some cases, a more fundamental approach lies in such things as a more equal sharing of the burdens of child care, replacement of physical punishment with non-violent methods of child care and training, eliminating the stresses and insecurity which now characterize our economic system, and strengthening the ties of individual families to the extended family and the community.     

Modeling Skipped and Not‐Reached Items Using IRTrees

When dealing with missing responses, two types of omissions can be discerned: items can be skipped or not reached by the test taker. When the occurrence of these omissions is related to the proficiency process the missingness is nonignorable. The purpose of this article is to present a tree‐based IRT framework for modeling responses and omissions jointly, taking into account that test takers as well as items can contribute to the two types of omissions. The proposed framework covers several existing models for missing responses, and many IRTree models can be estimated using standard statistical software. Further, simulated data is used to show that ignoring missing responses is less robust than often considered. Finally, as an illustration of its applicability, the IRTree approach is applied to data from the 2009 PISA reading assessment.     

Universal metadata standard

Consciousness is based on the association of notions or a neural network. Similarly, the creation of the next-generation Internet (semantic web) is impossible without attributes that allow the semantic association of documents and their integration into an information context. To achieve these goals, the Universal Metadata Standard (UMS) may serve as a basis for documentography and is functionally required for interpretation of documents by automatic operating systems.     

Formation of the scientific concepts about the documental forms of information. The legal and source-study concepts of a document

The active use of documental information in various fields of activity has resulted in the formation of four main concepts of a document: the legal, source-study, gnoseological, and management concepts. The history of the origin and development of the legal and source-study concepts is considered. The significant influence that is exerted by the positivistic philosophy on the formation of these concepts is noted.     

RIM: A Random Item Mixture Model to Detect Differential Item Functioning

In this paper we present a new methodology for detecting differential item functioning (DIF). We introduce a DIF model, called the random item mixture (RIM), that is based on a Rasch model with random item difficulties (besides the common random person abilities). In addition, a mixture model is assumed for the item difficulties such that the items may belong to one of two classes: a DIF or a non-DIF class. The crucial difference between the DIF class and the non-DIF class is that the item difficulties in the DIF class may differ according to the observed person groups while they are equal across the person groups for the items from the non-DIF class. Statistical inference for the RIM is carried out in a Bayesian framework. The performance of the RIM is evaluated using a simulation study in which it is compared with traditional procedures, like the likelihood ratio test, the Mantel-Haenszel procedure and the standardized p -DIF procedure. In this comparison, the RIM performs better than the other methods. Finally, the usefulness of the model is also demonstrated on a real life data set.     

Bookselling—book buying: The European perspective of the online market

The book market in European countries is different than the U.S. market for various political, geographical, and cultural reasons. The authors outline these differences and provide background on the move to electronic commerce and future. The article includes many electronic and print sources of and bibliographic tools for locating books in the European market.     

Analysis of publications of the pilot issue of the data collection of the All-Russia Institute of Scientific and Technical Information of the Russian Academy of Sciences “Industry of Nanosystems and Nanomaterials”

The pilot issue of the data collection of the All-Russian Institute of Scientific and Technical Information of the Russian Academy of Sciences “Industry of Nanosystems and Nanomaterials” gives an approximate view of the state of this field of science at the beginning of 2007. The topics of articles in the pilot issue are analyzed. The directions of development of nanotechnologies are shown. The basic types of nanomaterials, the methods of their production, and their properties and applications are given.