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161.
Child care denotes any arrangement used by a working parent for care of a child, including self-care. This article is concerned with the factors that influence the demand for market modes of child care by two parent families with working mothers. A unique aspect of the study is that it is able to assess the impact of a child care subsidy program. An implication of the analysis is that the demand for market care is price elastic and is therefore susceptible to considerable change through programs of increased subsidization. 相似文献
162.
163.
Two-year-old children's conversational replies were observed in two social contexts: (a) with a partner who consistently responded to each of their utterances by semantically reciprocating and commenting briefly on their topic; or (b) with a partner who also consistently replied to each of their utterances but did not semantically reciprocate their topic. Children were significantly more likely to reply to a partner who maintained their topic. Given that a child replied, the verbal responses in the semantic reciprocation group were also more likely to have a topic-comment structure characteristic of more advanced conversational skills. These experimental data confirm previous correlational evidence suggesting that children are sensitive to semantic reciprocation during the early stages of verbal communicative development, and they support recent arguments suggesting that the adult's use of expansions scaffolds the child's tendency to use predicative, topic-comment replies…and perhaps advances the child's understanding of the adult partner as an attentional/intentional mental agent. 相似文献
164.
Philip G. Brabazon Bart MacCarthy Andrew Woodcock Robert W. Hawkins 《Production and Operations Management》2010,19(5):489-502
Mass customization has been viewed as desirable but difficult to achieve in the volume automotive sector. Here we consider flexibility in automotive order fulfillment systems to enhance the ability to satisfy customers with their desired vehicle variants within acceptable delivery lead times. Two types of flexibility are compared in a Virtual‐Build‐to‐Order system—reconfiguration in the planning pipeline and interdealer trading. A representative simulation model is used to investigate the impact of the two types of flexibility across a wide spectrum of product variety levels. The impacts on major stakeholders in the system—the producer, dealers, and customers—are considered. The study shows that both types of flexibilities can bring significant benefits in terms of reductions in lead time and inventory holding. The level of product variety strongly influences the observed effects—an important finding in the mass customization context. Upstream reconfiguration flexibility brings greater benefits than downstream trading flexibility. Reconfiguration tends to dominate trading as a fulfillment mechanism when both are in operation. The findings have implications for the design and management of automotive order fulfillment systems in improving their ability to offer mass customization. The study has relevance for companies in other sectors with high levels of variety that seek to combine efficiency, speed, and flexibility in order fulfillment. 相似文献
165.
This article highlights the centrality of language in early childhood development and the potential for language delays to negatively affect long-term outcomes in educational and social domains. Given the high rate of language delays in the foster care population, an emphasis should be placed on assessing language skills among children ages 6 and younger entering foster care. The authors describe several existing approaches to assessing language skills and discuss obstacles to the widespread implementation of systematic evaluation among foster children. Finally, the authors discuss the need for research and programming to establish evidence-based practices that encourage the remediation of language delays in this highly vulnerable population. 相似文献
166.
Buchanan-Barker P Barker PJ 《Journal of psychosocial nursing and mental health services》2006,44(9):29-33
The concept of recovery is an important part of contemporary mental health services. During the past 5 years, Tidal Model projects, focused on developing the recovery attitude within nursing practice, have been established in several different countries. The Tidal model emphasizes 10 philosophical assumptions the "Ten Commitments," that are central to recovery-focused practice. 相似文献
167.
Steven Berry Amit Gandhi Philip Haile 《Econometrica : journal of the Econometric Society》2013,81(5):2087-2111
We consider the invertibility (injectivity) of a nonparametric nonseparable demand system. Invertibility of demand is important in several contexts, including identification of demand, estimation of demand, testing of revealed preference, and economic theory exploiting existence of an inverse demand function or (in an exchange economy) uniqueness of Walrasian equilibrium prices. We introduce the notion of “connected substitutes” and show that this structure is sufficient for invertibility. The connected substitutes conditions require weak substitution between all goods and sufficient strict substitution to necessitate treating them in a single demand system. The connected substitutes conditions have transparent economic interpretation, are easily checked, and are satisfied in many standard models. They need only hold under some transformation of demand and can accommodate many models in which goods are complements. They allow one to show invertibility without strict gross substitutes, functional form restrictions, smoothness assumptions, or strong domain restrictions. When the restriction to weak substitutes is maintained, our sufficient conditions are also “nearly necessary” for even local invertibility. 相似文献
168.
Philip Prescott 《统计学通讯:理论与方法》2013,42(5):763-784
In practical situations involving mixtures formed from several ingredients, interest is sometimes centered on the response in an ellipsoidal neighborhood around a standard formulation. We show that standard, orthogonally blocked, response surface designs, defined on a q ? 1 dimensional unit sphere, may be transformed into similarly orthogonally blocked q-ingredient mixture designs defined within an ellipsoid centered at the standard formulation. The method is illustrated using several examples of mixture experiments with three, four, and five ingredients, arranged in two, three, or four orthogonal blocks, obtained by projecting standard central composite designs and Box–Behnken designs into the ellipsoidal mixture region. Rotations of the resulting designs within the ellipsoidal regions are also considered. 相似文献
169.
To assess the efficacy of a treatment, patients are administered a pre-test, the treatment, and a post-test (identical to the pre-test). These patients are then categorized according to their outcomes observed on both tests,e.g., (S,S), (S,F), etc. Also, we observe "incomplete" information on the pre-tests' outcomes for some patients and the results of only the post-test being known for thers, A Bayesian framework is fit to the problem and Bayes factors, posterior odds ratios, and utility functions are given to evaluate th e treatment, A method of assessing the prior distribution is specified and a numerical example is worked. 相似文献
170.
Philip Byrne 《统计学通讯:理论与方法》2013,42(6):1935-1943
When a covariance matrix has a pattern associated with a stationary time series on the errors, it is shown how certain hypothesis testing problems In multivariate analysis can be transformed into a product of two similar multivariate problems that each involve unpatterned covariance matrices. 相似文献