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951.
A significant practical disadvantage of multivariate statistical process control is that it is difficult to determine which of the monitored variables is responsible for the out-of-control signal. While there have been several proposed techniques and diagnostics, most of these have disadvantages. Rather than an ad hoc selection, we use three approaches to develop a diagnostic for a chi-square chart and generate the same statistic from each approach. Consequently, intuitive interpretations of the diagnostic are provided and previous proposals are simplified by a focus on a single metric. 相似文献
952.
A quadratic almost ideal demand system allowing for age, cohort, and trend effects is developed at the macro level. The model is estimated by maximum likelihood, using a three-tier iterative/search method applied to pooled 1961–1992 time series for five regions of Canada and six categories of expenditure. Hypothesis tests indicate support for the model specification. Elasticities are compared with those reported in other studies, with special attention to food. Effects of demographic and trend variables on elasticities and expenditure shares are investigated. An overall conclusion is that such effects can be very important in a macro demand system. 相似文献
953.
954.
Ove Frank 《Journal of statistical planning and inference》1980,4(1):45-50
An unknown graph is partially observed by selecting a vertex sample and observing the edges in the subgraph induced by the sample. The sample is selected by either simple random sampling or Bernoulli sampling. We consider the problem of estimating the numbers of vertices of different degrees in the unknown graph by using the sample information. Unbiased estimators are given and their variance-covariance matrix is shown to depend on a set of intrinsic graph parameters which can hardly be satisfactorily estimated from the sample information without further assumptions. In particular, the problem of estimating the number of isolates (vertices of degree zero) is considered in some detail. 相似文献
955.
Wylie (1974) points out that there is a lack of adequate theoretical development in the investigation of the self-concept. The result is a proliferation of operational definitions with no clear understanding of the relationship between operations, between constructs, and between the constructs and their operationalizations. In this article we make explicit the theoretical component of self to which this Self-image Inventory relates. The article presents the inventory and twenty years of research experience with it. The inventory is found to be both reliable and valid for measuring the self-image as a role specific component of self. 相似文献
956.
957.
Anne H. Gauthier Timothy M. Smeeding Frank F. Furstenberg Jr. 《Population and development review》2004,30(4):647-672
Trends in parental time invested in children since the 1960s are examined in 16 industrialized countries using time-use survey data. Despite the time pressures that confront today's families, parents appear to be devoting more time to children than they did 40 years ago. Results also suggest that mothers continue to devote more time to childcare than fathers, but the gender gap has been reduced. The consistency of these results across countries suggests a global trend toward an increase in parental time investment in children. Multivariate analysis of trends in parental time by type of activity was undertaken for Canada. It revealed a significant increase in parental time even after controlling for changes in the demographic composition of the population during the past few decades. 相似文献
958.
Culturally Relevant Psychotherapy for Perinatal Depression in Low-Income Ob/Gyn Patients 总被引:1,自引:0,他引:1
Nancy K. Grote Sarah E. Bledsoe Holly A. Swartz Ellen Frank 《Clinical Social Work Journal》2004,32(3):327-347
To minimize barriers to care, ameliorate antenatal depression, and prevent postpartum depression in low-income women, we propose that a culturally relevant version of brief interpersonal psychotherapy (IPT-B) may be an effective approach. IPT-B is a modified form of Interpersonal Psychotherapy (IPT), an efficacious treatment for depression that we have altered to address the needs of women who have difficulty adhering to longer courses of psychotherapy. Culturally relevant additions to IPT-B include (1) a pre-treatment engagement strategy consisting of an ethnographic interview accompanied by psychoeducation to engage women in treatment; (2) convenient delivery of IPT-B in a public care Ob/Gyn clinic where the women receive prenatal services; (3) flexible scheduling of treatment sessions at the clinic or on the phone; and 4) facilitation of access to social services. 相似文献
959.
Frank G. Kauffman 《Child and Adolescent Social Work Journal》2007,24(6):553-563
This qualitative study seeks to understand the correlation between intensive family preservation services and family functioning
in those families who have participated in services. The focus is on the perceptions of client families with respect to the
impact of services on family functioning including communication, family dynamics, and parenting skills. The discussion centers
on the responses of client families to a narrowly constructed survey instrument designed to capture their perceptions with
respect to the services provided by case workers. 相似文献
960.