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151.
One core contention of the generational equity argument is that elderly people are financially well-off. To support this argument, generational equity proponents compare poverty rates of elderly people to those of children in the United States demonstrating that elderly people enjoy a privileged position in terms of financial well-being as compared to other age groups. I argue that the measurement of poverty upon which this argument is based is grounded in faulty logic and incorrect assumptions. Therefore, the basis of this generational equity argument is invalid. I conclude that using poverty rates creates the impression of a conflict between children and elderly people drawing attention away from the continuing problem of discrimination against women and minorities. 相似文献
152.
R. G. Jarreit S. Liow B. J. T. Morgan 《Australian & New Zealand Journal of Statistics》1985,27(1):36-43
Given that two circles overlap, the area in common is a function of the distance between their centres. This paper adopts a suitable random distribution for the intercentre distance and then derives the distribution of the area of overlap. An approximation is sought for the density function using a criterion which enables bounds to be placed on the difference between the moments of the density function and those of the approximation. This is an approach of general applicability. The importance of matching the end-point behaviour of the density and the approximation is stressed. It is shown that the distribution of the area of overlap may be well approximated by a mixture of beta distributions in which the parameters change smoothly with the ratio of radii. 相似文献
153.
In a cluster analysis of a multivariate data set, it may happen that one or two observations have a disproportionately large effect on the analysis, in the sense that their removal causes a dramatic change to the results. It is important to be able to identify such influential observations, and the present paper addresses this problem. To do so, we must first quantify the effect of a single observation. Various definitions are discussed, and criteria for identifying influential observations are investigated; the minimum spanning tree and the number of neighbours of each observation are considered. The investigation concentrates on single-link cluster analysis, although complete-link analysis is also briefly discussed. Patterns emerge in both real and simulated data, which suggest ways of predicting observations with no effect and those with the greatest effect. It is not necessary to recalculate the results with each observation omitted—an economy of presentation as well as labour. 相似文献
154.
The most robust finding on infants' listening preferences has been widely characterized as a preference for baby talk (BT) over adult‐directed speech (ADS). Although prosodic modifications characteristic of BT also convey positive affect, differences in affect across BT and ADS speech registers have not been controlled in previous studies. This set of experiments sought to elucidate the basis for 6‐month‐olds' listening preference by independently manipulating affect and speech register. When affect was held constant, no preference for any speech register was observed. Moreover, when ADS stimuli presented more positive affect than BT stimuli, infants' preferences followed the positive affect. Higher and more variable pitch was neither necessary nor sufficient for determining infants' preferences, although pitch characteristics may modulate affect‐based preferences. The BT preference is thus attributable to a more general preference for speech that imparts relatively positive affect, a preference perhaps ascribable to a preexisting general‐purpose mechanism opportunistically exploited by language. 相似文献
155.
What Do We Know About Making Risk Comparisons? 总被引:2,自引:0,他引:2
Emilie Roth M. Granger Morgan Baruch Fischhoff Lester Lave Ann Bostrom 《Risk analysis》1990,10(3):375-387
The risks of unfamiliar technologies are often evaluated by comparing them with the risks of more familiar ones. Such risk comparisons have been criticized for neglecting critical dimensions of risky decisions. In a guide written for the Chemical Manufacturers Association, Covello et al. (1 ) have summarized these critiques and developed a taxonomy that characterizes possible risk comparisons in terms of their acceptability (or objectionableness). We asked four diverse groups of subjects to judge the acceptability of 14 statements produced by Covello et al. as examples of their categories. We found no correlation between the judgments of acceptability produced by our subjects and those predicted by Covello et al. . 相似文献
156.
The Disability Movement in Northern Ireland 总被引:1,自引:1,他引:0
Michael Morgan 《Disability & Society》1995,10(2):233-236
157.
158.
E. A. Catchpole B. J. T. Morgan T. Coulson 《Journal of the Royal Statistical Society. Series C, Applied statistics》2004,53(1):123-131
Summary. Key ecological studies involve the regular censusing of populations of wild animals, resulting in individual case history data which record when marked individuals are seen alive and/or found dead. We show how current conditional methods of analysing case history data may be biased. We then show how a correction can be applied, making use of results from a mark–recovery–recapture analysis. This allows a simple investigation of the effect of time-varying individual covariates such as weight that often contain missing values. The work is motivated and illustrated by the study of Soay sheep in the St Kilda archipelago. 相似文献
159.
160.