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71.
Predictor importance in applied regression modeling gives the main operational tools for managers and decision-makers. The paper considers estimation of predictors' importance in regression using measures introduced in works by Gibson and R. Johnson (GJ), then modified by Green, Carroll, and DeSarbo, and developed further by J. Johnson (JJ). These indices of importance are based on the orthonormal decomposition of the data matrix, and the work shows how to improve this approximation. Using predictor importance, the regression coefficients can also be adjusted to reach the best data fit and to be meaningful and interpretable. The results are compared with the robust to multicollinearity, but computationally difficult, Shapley value regression (SVR). They show that the JJ index is good for importance estimation, but the GJ index outperforms it if both predictor importance and coefficients of regression are needed; hence, this index (GJ) can be used in place of the more computationally intensive estimation by SVR. The results can be easily estimated by the considered approach that is very useful in practical regression modeling and analysis, especially for big data. 相似文献
72.
The Job Demand-Control (JDC) model (Karasek, 1979) and the Job Demand-Control-Support (JDCS) model (Johnson, and Hall, 1988) have dominated research on occupational stress in the last 20 years. This detailed narrative review focuses on the JDC(S) model in relation to psychological well-being. It covers research from 63 samples, published in the period 1979-1997. In the review a distinction is drawn between two different hypotheses prevailing in research on the models. According to the strain hypothesis of the JDC model, employees working in a high-strain job (high demands-low control) experience the lowest well-being. The buffer hypothesis states that control can moderate the negative effects of high demands on well-being. Translating these hypotheses to the expanded JDCS model, the iso-strain hypothesis predicts the most negative outcomes among workers in an iso-strain job (high demands-low control-low social support/isolation), whereas the buffer hypothesis states that social support can moderate the negative impact of high strain on well-being. Although the literature gives considerable support for the strain and iso-strain hypotheses, support for the moderating influence of job control and social support is less consistent. The conceptualization of demands and control is a key factor in discriminating supportive from nonsupportive studies. Only aspects of job control that correspond to the specific demands of a given job moderate the impact of high demands on well-being. Furthermore, certain subpopulations appear to be more vulnerable to high (iso)strain, whereas others benefit more from high control. On the basis of the results of this review, suggestions for future research and theoretical development are formulated. 相似文献
73.
This paper compares the performance of three methods applicable to national-level demographic data of estimating births averted as a consequence of contraceptive practice. Two are based on the relationship between the general fertility rate (GFR) or total fertility (TFR) and contraceptive prevalence, while the third uses Bongaarts' proximate determinants (PD) model. Estimates of the number of births averted and the percentage by which the number would have increased in the absence of contraception are consistent between the GFR-based and TFR-based methods, but in general lower than the estimates generated by the PD-based method, except for a few high-contraceptive-prevalence countries. For 156 countries and areas around the world the estimated number of births that would have occurred in a recent year in the absence of contraception--the average of the estimates of the three methods--is approximately 230 million, which is more than the estimated 129 million births that actually occurred. 相似文献
74.
Stan Schenkerman 《决策科学》1991,22(2):369-378
This paper examines difficulties with the use of weights to solve multiple objective decision support models: misunderstanding of the meaning of weights, issues of commensurability and, most important, the likely inability of weights alone to isolate the decision maker's most-preferred point. The constraint method is shown to be an attractive alternative. 相似文献
75.
Poverty in Nonmetropolitan America: Impacts of Industrial,Employment, and Family Structure Variables
Abstract Poverty is more extensive and more severe in nonmetropolitan areas than in metropolitan areas. Here we maintain that the extensive industrial and economic transformations occurring in rural areas have resulted in patterns contributing to these high poverty levels. These transformations, which include an increase in service‐sector employment, in many ways mirror the economic changes that have occurred in the inner city. We maintain that Wilson's model of the inner‐city underclass can be useful in understanding some poverty trends in nonmetropolitan areas. To test the Wilson model, we analyze 1990 census data. The data generally support the model and indicate that the industrial transformation of rural areas leads to changes in the gender structure of the labor force, and to a more unbalanced sex ratio. These changes, in turn, result in adjustments to family structure, including an increase in the percentage of female‐headed households. This process results in higher poverty levels. 相似文献
76.
In this paper we develop and test a theory of childhood mortality after the first month of life. Parents are assumed to have well-defined family size and sex composition objectives and to face severe budget constraints. In this set of circumstances, it is understandable that they will make allocative decisions that will affect the survival probabilities of children. These decisions and the environmental influences on mortality are the basic forces which determine whether a child will survive through the post-neonatal period. The model is tested with survey data from rural Uttar Pradesh, India. The results are consistent with the hypothetical framework discussed above. The burden of this pattern of choice is felt particularly strongly by female births. 相似文献
77.
One of the most difficult environmental policy challenges facing the United States and other societies is that of finding ways to safely dispose of hazardous and toxic substances, including nuclear waste materials. Efforts to site such facilities have been uniformly unsuccessful, due largely to strong public opposition. Although supporters of such facilities often emphasize the potential for local economic development and other opportunities, opponents focus on a variety of threats involving potential risks associated with waste disposal. Survey data collected in rural areas of Nevada and Nebraska where nuclear waste disposal facilities have been proposed reveal that respondents' positions on issues of perceived health and safety risks, trust in responsible agencies, anticipated local economic effects, and concerns about environmental contamination are key variables predicting local response. Even in areas where there may be substantial local support for economic opportunities associated with the facilities, broad-based fears about nuclear materials and a legacy of distrust in the agencies responsible for managing nuclear wastes suggest that proposals for such facilities will almost inevitably continue to generate strong public opposition. 相似文献
78.
79.
Abstract As predicted by the classic sociological theories of Durkheim, Tonnies, and others, early sociological researchers found extensive differences between urban and rural residents in the United States. In recent decades, many of these differences have appeared to wane, or in some cases, totally disappear. Based on these classic theories, we maintain that many of the urban/rural differences found in the past were actually farm/nonfarm differences. Further, we argue that many of these differences continue to exist in rural America, but they have been suppressed by major demographic transitions. Utilizing Current Population Survey data on family structure, we found that there were few significant differences between urban and rural nonfarm residents, but both varied extensively from various segments of the farm population. 相似文献
80.
In this article, the Food and Drug Administration's (FDA) medical device substantial equivalence provision will be briefly introduced and some statistical methods useful for evaluating device equivalence are discussed. A sample size formula is derived for limits of agreement, which may be used to assess statistical equivalence in certain medical device situations. Simulation findings on the formula are presented, which can be used to guide sample size selections in common practical situations. Examples of the sample size procedure are given. 相似文献