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981.
Model-based clustering for social networks 总被引:5,自引:0,他引:5
Mark S. Handcock Adrian E. Raftery Jeremy M. Tantrum 《Journal of the Royal Statistical Society. Series A, (Statistics in Society)》2007,170(2):301-354
Summary. Network models are widely used to represent relations between interacting units or actors. Network data often exhibit transitivity, meaning that two actors that have ties to a third actor are more likely to be tied than actors that do not, homophily by attributes of the actors or dyads, and clustering. Interest often focuses on finding clusters of actors or ties, and the number of groups in the data is typically unknown. We propose a new model, the latent position cluster model , under which the probability of a tie between two actors depends on the distance between them in an unobserved Euclidean 'social space', and the actors' locations in the latent social space arise from a mixture of distributions, each corresponding to a cluster. We propose two estimation methods: a two-stage maximum likelihood method and a fully Bayesian method that uses Markov chain Monte Carlo sampling. The former is quicker and simpler, but the latter performs better. We also propose a Bayesian way of determining the number of clusters that are present by using approximate conditional Bayes factors. Our model represents transitivity, homophily by attributes and clustering simultaneously and does not require the number of clusters to be known. The model makes it easy to simulate realistic networks with clustering, which are potentially useful as inputs to models of more complex systems of which the network is part, such as epidemic models of infectious disease. We apply the model to two networks of social relations. A free software package in the R statistical language, latentnet, is available to analyse data by using the model. 相似文献
982.
Govind S. Mudholkar Philip A. Smethurst 《Australian & New Zealand Journal of Statistics》1990,32(2):129-138
If the asymptotic normality of a statistic is inadequate for approximating its distribution in practice, then the statistic may be transformed in order to improve the approximation by accelerating the convergence to normality. We treat a goodness-of-fit statistic, the sum of the logarithms of generalized uniform spacings introduced by Cressie (1976, 1978), in this spirit. Specifically, we apply the method of maximum likelihood to simulations of the statistic in order to estimate a power transformation, as in Box & Cox (1964), and hence develop a small sample normal approximation. This approximation provides a more versatile method of applying the statistic than currently available tables of percentiles. 相似文献
983.
Diane de Anda Ph.D Patricia Darroch M.S.W. Marion Davidson M.S.W. Jennifer Gilly M.S.W. Alina Morejon M.S.W. 《Child and Adolescent Social Work Journal》1990,7(1):53-67
A five week stress management program for pregnant adolescents and adolescent mothers emphasizing deep muscle relaxation and cognitive control methods was pilot tested with 23 experimental and 12 control subjects. The experimental group demonstrated a significantly greater reduction in cognitive and affective manifestations of stress and an increased belief in their ability to deal with stress. While the differences between the groups did not reach statistical significance with respect to changes in overall stress levels or use of specific coping strategies, a consistent trend was demonstrated in the data for more positive changes in the experimental group. Recommendations were made for an expanded program, the inclusion of incentives, and the program's inclusion in the school schedule. 相似文献
984.
Measuring a statistical model's complexity is important for model criticism and comparison. However, it is unclear how to do this for hierarchical models due to uncertainty about how to count the random effects. The authors develop a complexity measure for generalized linear hierarchical models based on linear model theory. They demonstrate the new measure for binomial and Poisson observables modeled using various hierarchical structures, including a longitudinal model and an areal‐data model having both spatial clustering and pure heterogeneity random effects. They compare their new measure to a Bayesian index of model complexity, the effective number pD of parameters (Spiegelhalter, Best, Carlin & van der Linde 2002); the comparisons are made in the binomial and Poisson cases via simulation and two real data examples. The two measures are usually close, but differ markedly in some instances where pD is arguably inappropriate. Finally, the authors show how the new measure can be used to approach the difficult task of specifying prior distributions for variance components, and in the process cast further doubt on the commonly‐used vague inverse gamma prior. 相似文献
985.
Naomi R. Malin D.S.W. 《Clinical Social Work Journal》1990,18(2):115-129
Terminations or interruptions of psychotherapy which have been followed by a patient's resuming therapy with the same therapist at a later time have often been viewed as premature with the implication that the initial therapy has been inadequate or deficient. This paper suggests, however, that a patient returns to the same therapist because the selfobject bond established in the initial treatment is still intact, and that the hiatus between treatments can be a time of further development and strengthening of self structure. Two clinical cases are described which illustrate these ideas. 相似文献
986.
Murray S. Davis 《Qualitative sociology》1997,20(3):369-388
By originating and developing the sociological investigation of human experience, Georg Simmel and Erving Goffman have shifted social phenomena at the edge of awareness to the center of attention, and have legitimated their study for contemporary sociologists. Both Simmel and Goffman describe these subtle social phenomena by distinguishing their perceptual boundaries and crossover elements, pointing out their common features when their statuses differ, and reversing their traditional location in means-end and cause-effect chains. But Durkheim's influence on Goffman's basic conceptions of interaction, individual, and society differentiated his interpretation of these social phenomena from Simmel's. Moreover, Simmel's and Goffman's explanations of these social phenomena evolve in different directions, revealing the antithetical goals toward which spiritual transcendental Simmelians and cynical reductive Goffmanians would lead sociology. 相似文献
987.
988.
G S Blum 《Behavioral science》1989,34(1):16-45
Unconscious inhibitory processes, triggered by a potential anxiety reaction, are reviewed in the context of an emerging rapprochement between psychodynamic and cognitive approaches in experimental psychology. Conditions underlying spread of inhibitory action to other cognitive networks are first explored in three tachistoscopic experiments utilizing words posthypnotically tied to a potential anxiety, pleasure, or neutral reaction. Response times of subjects, instructed to ignore those words while naming pictures or solving anagrams as quickly as possible, reveal a highly differentiated pattern of circumstances governing likelihood of inhibitory spread from anxiety-linked words to target stimuli. Next a computer model is constructed to simulate cognitive processes from onset of display to eventual response, and the model is then tested for its fit to the empirical data. Finally, an illustrative study shows that a subset of computer-generated predictions for spread of inhibitory action is verifiable experimentally. 相似文献
989.
S. J. Duckett 《The Australian journal of social issues》1977,12(3):188-199
The report of the Task Force on Coordination in Welfare and Health (Bailey Report) is the most important single report on the organization of health and welfare services since the first Medibank Green Paper. It provides for the collapsing of a plethora of categorical grants into four broad ‘programme grants’. The effects of this report will be felt by most health and welfare organizations. It is the purpose of the article to review the main recommendations of the Task Force and of the related Report from the Committee on the Aged and the Infirm. 相似文献
990.
Although many studies find that smoking bans reduce cigarette demand, arguments can be made for smoking bans also affecting alcohol demand. Accordingly, in this paper we address the determinants of state-level alcohol demand, which we treat as a function of various economic and demographic variables, as well as smoking bans. Results reveal that smoking bans reduce the demand for beer and spirits. Furthermore, smoking bans tend to intensify the complementary relationship between cigarettes and alcohol, which suggests that smoking bans have altered consumer demographics in the alcohol market. We also find the nature of the smoking ban matters, as bans specific to restaurants and bars lead to larger reductions in beer and spirits consumption, but increase the demand for wine. 相似文献