Rapid demand curves for behavioral economics

A method for determining the relationship between food consumption and the price of food (demand function) in behavioral economic experiments is described. Although previous methods have generally required as long as 40 days, the present method can generate a complete demand function within 7 days, and therefore may be more suitable for use in the evaluation of drugs, toxins, and physiological/anatomical interventions. Moreover, measures of circadian rhythmicity, post-reinforcement pause durations, and interresponse times can also be generated. Three experiments tested the stability of the method in a variety of procedural manipulations: repeated exposure to the procedure, increasing versus random daily food price, and size of daily changes in food price. The procedure generated demand functions that were similar to those that require more extended testing, and the demand functions were not generally affected by procedural manipulations. Body weight, which can also affect consumption, generally decreases with increases in the price of food; so this variable should be recorded and used as a covariate in analyzing demand functions. With the exception of circadian rhythmicity, the other measures were stable across procedural variations and showed expected changes as a function of food price: postreinforcement pause durations increased as price increased, but interresponse times did not.     

开发统一的领导体系——乔治亚州与俄勒冈州执行的领导政策框架

在美国，州与学区的政策都有效影响了学校领导的发展。这些政策大致可以归为三类：1．标准类：教育领导者应该知道并能做什么？2．培训类：我们如何培训领导者了解并能够履行这些标准？3．环境类：影响教育领导者如何以及是否能够最好地履行自己能力的工作环境与政策是什么？     

Curriculum Alignment with a Mission of Social Change in Higher Education

Institutions of higher education frequently acknowledge their role in contributing to the common good through their mission statements. The current literature suggests that in order to be effective mission statements must be clearly articulated and reflected in all the activities of the institution including its curriculum. Faculty members at Walden University developed a Curriculum Guide for Social Change that could serve as a tool for reviewing current course offerings and developing new courses to reflect its mission of “creating positive social change.” Those involved in piloting the Guide report on the process in this article. The general consensus is that it was time-consuming and frequently subjective; but the Guide gave substance to the institution’s mission, opening the way for its fuller implementation.     

The effect of systematic training in elaboration on word meaning and prose comprehension in poor readers

This paper reports two interrelated, exploratory training studies to promote word knowledge and textual comprehension through elaboration in poor readers compared with their controls. The results suggest that systematic, sustained in situ training helped these poor readers, although both the training approaches and stimulus materials would need refinement. The study was assisted in part by the Social Sciences and Humanities Research Council of Canada with SSHRCC research grants Nos. 410-87-0058 and 410-89-0128 awarded to Che Kan Leong.     

Effects of Technology-Mediated Vocabulary Intervention for Third-Grade Students with Reading Difficulties

Abstract

In this experimental study, we examined the effects of a technology-mediated intervention to improve students’ understanding of academic vocabulary and its impact on measures of vocabulary and comprehension. The Vocabulators program was implemented in two states involving 24 teachers and 200 third-grade students identified as in need of supplemental vocabulary instruction. Individual students within each classroom were randomly assigned to treatment (n?=?100) or typical instructional practices (n?=?100) conditions. In the treatment condition, students received, on average, 29 lessons on vocabulary and comprehension. Results of linear regression analyses showed statistically significant and practical effects on experimenter-developed proximal measures of decoding (ES = 0.52), expressive vocabulary (ES = 0.78), receptive vocabulary (ES = 0.51), and near transfer measures of understanding vocabulary in sentences (ES = 0.65), and informational text comprehension (ES = 0.28). Group performance did not differ statistically on near transfer measures of sentence verification with vocabulary and narrative text comprehension as well as distal standardized measures of general vocabulary or reading comprehension. Findings suggest the potential impact of technology-based vocabulary/comprehension lessons to supplement typical instruction.     

Instruction in Pre‐reading Skills in Preschool Children and its Effect on the Subsequent Rate of Reading Attainment

The effect of three preschool conditions on early reading attainment in the first four terms at primary school was studied. The conditions were: (a) nursery education with computer‐presented structured pre‐reading instruction comprising visual and auditory discrimination and recognition of letter shapes and sounds, (b) ‘normal’ nursery activities, and (c) no formal nursery education. The initial reading performance of these children in the three conditions was then monitored during their first two terms in the same class group of a first school. The group who received pre‐reading skills training was found not only to learn to read more quickly in terms of the number of books in the reading scheme read, but for this superiority to increase over the two terms, compared to the nursery only and the no‐nursery groups. Both the nursery conditions were superior to the no‐nursery group. The results were interpreted as indicating the importance of structured learning of basic pre‐reading skills and of the computer as an effective means of presenting them.     

What Difference Does a Major Make? The Influence of College Major Field on Persistence by African American and White Students

The results from this study indicate similarities and differences in the factors related to the persistence of White and African American students in their freshman and sophomore years in college. Using random samples of data from students enrolled in public institutions of higher education in a Midwestern state, OLS regression analyses indicated that African American sophomores in the high-demand major fields (e.g., Business, Health, and Engineering/Computer Science) were more likely to persist than were those in other major fields, but there were no statistically significant differences in persistence for African American freshmen in other fields. While major fields were not statistically significant for White sophomores, White freshmen in social sciences or undecided about their majors were less likely to persist. The effects of financial aid packages on persistence varied across race.