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21.
Charles F. Hanna 《Qualitative sociology》1981,4(4):298-311
Complaining is a common pattern of interaction that can be viewed as a form of association. Our understanding of complaint and other forms of association is enhanced by applying insights from Simmel's formal sociology. The emergence of complaint, like other forms of association, adheres to a general developmental process and has specifiable social consequences. The integrative and disintegrative social consequences of complaint are spelled out. 相似文献
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Sondra S. Teske Mark H. Weir Timothy A. Bartrand Yin Huang Sushil B. Tamrakar Charles N. Haas 《Risk analysis》2014,34(5):911-928
The effect of bioaerosol size was incorporated into predictive dose‐response models for the effects of inhaled aerosols of Francisella tularensis (the causative agent of tularemia) on rhesus monkeys and guinea pigs with bioaerosol diameters ranging between 1.0 and 24 μm. Aerosol‐size‐dependent models were formulated as modification of the exponential and β‐Poisson dose‐response models and model parameters were estimated using maximum likelihood methods and multiple data sets of quantal dose‐response data for which aerosol sizes of inhaled doses were known. Analysis of F. tularensis dose‐response data was best fit by an exponential dose‐response model with a power function including the particle diameter size substituting for the rate parameter k scaling the applied dose. There were differences in the pathogen's aerosol‐size‐dependence equation and models that better represent the observed dose‐response results than the estimate derived from applying the model developed by the International Commission on Radiological Protection (ICRP, 1994) that relies on differential regional lung deposition for human particle exposure. 相似文献
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Charles F. Manski 《The American statistician》2019,73(1):296-304
AbstractA central objective of empirical research on treatment response is to inform treatment choice. Unfortunately, researchers commonly use concepts of statistical inference whose foundations are distant from the problem of treatment choice. It has been particularly common to use hypothesis tests to compare treatments. Wald’s development of statistical decision theory provides a coherent frequentist framework for use of sample data on treatment response to make treatment decisions. A body of recent research applies statistical decision theory to characterize uniformly satisfactory treatment choices, in the sense of maximum loss relative to optimal decisions (also known as maximum regret). This article describes the basic ideas and findings, which provide an appealing practical alternative to use of hypothesis tests. For simplicity, the article focuses on medical treatment with evidence from classical randomized clinical trials. The ideas apply generally, encompassing use of observational data and treatment choice in nonmedical contexts. 相似文献
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AbstractGrubbs and Weaver (1947) suggest a minimum-variance unbiased estimator for the population standard deviation of a normal random variable, where a random sample is drawn and a weighted sum of the ranges of subsamples is calculated. The optimal choice involves using as many subsamples of size eight as possible. They verified their results numerically for samples of size up to 100, and conjectured that their “rule of eights” is valid for all sample sizes. Here we examine the analogous problem where the underlying distribution is exponential and find that a “rule of fours” yields optimality and prove the result rigorously. 相似文献
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Simultaneous model-based clustering and visualization in the Fisher discriminative subspace 总被引:1,自引:0,他引:1
Clustering in high-dimensional spaces is nowadays a recurrent problem in many scientific domains but remains a difficult task
from both the clustering accuracy and the result understanding points of view. This paper presents a discriminative latent
mixture (DLM) model which fits the data in a latent orthonormal discriminative subspace with an intrinsic dimension lower
than the dimension of the original space. By constraining model parameters within and between groups, a family of 12 parsimonious
DLM models is exhibited which allows to fit onto various situations. An estimation algorithm, called the Fisher-EM algorithm,
is also proposed for estimating both the mixture parameters and the discriminative subspace. Experiments on simulated and
real datasets highlight the good performance of the proposed approach as compared to existing clustering methods while providing
a useful representation of the clustered data. The method is as well applied to the clustering of mass spectrometry data. 相似文献
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The proliferation of internships and the rise of professionalisation in higher education are, in France, frequently condemned as evidence of a quest for greater employability, driven by a skills-based approach. A comparative analysis of the methods used to prepare students for employment shows the degree to which the social mechanisms are homogeneous in England (employability) and in Sweden (bildning). In France, the transition from higher education to employment entails a process of pre-professionalisation. This is characterised by the dominant role of professional skills and their incorporation into the structure of initial education itself. Rather than the outcome of a process of commodification, this mechanism of pre-professionalisation is explained by the persistence of an idealized conception of “matching” that still profoundly marks the relations between education and employment in France. 相似文献