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921.
922.
Daniel F. Linder Jingjing Yin Haresh Rochani Hani Samawi Sanjay Sethi 《统计学通讯:理论与方法》2018,47(5):1181-1203
The article details a sampling scheme which can lead to a reduction in sample size and cost in clinical and epidemiological studies of association between a count outcome and risk factor. We show that inference in two common generalized linear models for count data, Poisson and negative binomial regression, is improved by using a ranked auxiliary covariate, which guides the sampling procedure. This type of sampling has typically been used to improve inference on a population mean. The novelty of the current work is its extension to log-linear models and derivations showing that the sampling technique results in an increase in information as compared to simple random sampling. Specifically, we show that under the proposed sampling strategy the maximum likelihood estimate of the risk factor’s coefficient is improved through an increase in the Fisher’s information. A simulation study is performed to compare the mean squared error, bias, variance, and power of the sampling routine with simple random sampling under various data-generating scenarios. We also illustrate the merits of the sampling scheme on a real data set from a clinical setting of males with chronic obstructive pulmonary disease. Empirical results from the simulation study and data analysis coincide with the theoretical derivations, suggesting that a significant reduction in sample size, and hence study cost, can be realized while achieving the same precision as a simple random sample. 相似文献
923.
The primary aim of market segmentation is to identify relevant groups of consumers that can be addressed efficiently by marketing or advertising campaigns. This paper addresses the issue whether consumer groups can be identified from background variables that are not brand-related, and how much personality vs. socio-demographic variables contribute to the identification of consumer clusters. This is done by clustering aggregated preferences for 25 brands across 5 different product categories, and by relating socio-demographic and personality variables to the clusters using logistic regression and random forests over a range of different numbers of clusters. Results indicate that some personality variables contribute significantly to the identification of consumer groups in one sample. However, these results were not replicated on a second sample that was more heterogeneous in terms of socio-demographic characteristics and not representative of the brands target audience. 相似文献
924.
Daniel Navon 《Theory and Society》2017,46(2):143-176
This article examines the way advertising was rationalized in the early twentieth-century United States. Drawing on a targeted archival comparison with the United Kingdom, I show how the extensive mobilization undertaken to legitimate and rationalize advertising, rather than changes in the techniques employed in the content of ads themselves, were seen by actors in the mid-1920s to explain most of the extraordinary advances made by American advertising. Building on that comparison, I show how American advertising was transformed, particularly around World War I, into a legitimate profession situated at the center of a network of expertise about consumers and their media. Under the banner of “truth in advertising” ads came to be regarded as a legitimate, rational, and sustained business investment, leading to an enormous increase in aggregate expenditures. I argue that future research should examine how this process fuelled mass media and contributed to the conditions for modern consumerism. 相似文献
925.
Daniel Giunti 《Journal of homosexuality》2017,64(4):523-537
In Italy, homosexual people are not allowed to perform donor insemination/surrogacy or adoption, thus they become parents mainly in the context of previous heterosexual relationships. The current study examines the experiences of 34 gay fathers and 32 lesbian mothers with children from a heterosexual relationship. Data on homosexuality awareness, reasons for marriage and parenthood, and the coming-out process to children were collected. Most participants reported not being aware of their homosexuality when they married and became parents. The most common reasons for marriage were “love” and “social expectancy,” whereas parenthood was motivated mainly by the “desire for children and family.” Most participants came out to at least one child and reported a positive reaction. The most cited benefit of coming out was “openness/not hiding anymore.” The results suggest that the lives of gay and lesbian parents are shaped by their sexual minority status as well as by societal heterosexism. 相似文献
926.
Daniel Weston 《Journal of Sociolinguistics》2015,19(5):671-687
Schneider's Dynamic Model of Postcolonial English Development (2007) suggests that distinct local identities and their associated varieties of English emerge as a result of British colonization, and reach maturity only when ties to the colonial power are finally severed. While this developmental trajectory is well documented in many of the case studies discussed in, and since, Schneider (2007), a comparison of Hong Kong and Gibraltar shows, in certain cases, that association with Britain can be seen as the best guarantor of these local identities and varieties of English. The present article sketches this alternate developmental trajectory, and examines under what circumstances it may emerge and how widely it might be applied. 相似文献
927.
Heather L. Kirkorian Heather J. Lavigne Katherine G. Hanson Georgene L. Troseth Lindsay B. Demers Daniel R. Anderson 《Infancy》2016,21(1):37-64
The purpose of this study was to determine whether toddlers exhibit different eye‐movement patterns when watching real events versus video demonstrations in an object‐retrieval task. Twenty‐four‐month‐olds (N = 36) searched for a sticker on a felt board after watching an experimenter hide it behind a felt object in person or via video. Eye movements during the hiding event were recorded. Compared to those watching in‐person events, children watching video spent more time looking at the target location overall, yet they had relatively poor search performance. Visual attention to the target location predicted search performance in the video condition only; children who watched in‐person hiding events had high success rates even if they paid relatively little visual attention to the correct location. Findings are consistent with the hypothesis that toddlers process information more quickly for in‐person (versus video) events, enabling them to learn as well (or better) despite relatively low selective attention. Thus, relatively poor encoding, as well as memory retrieval, may underlie the video deficit. 相似文献
928.
929.
Information behavior includes activities of active information seeking, passive acquisition of information, and information use. Guided by the Elaboration Likelihood Model, this study explored elderly Singaporean women’s health information behavior to understand how they sought, evaluated, and used health information in everyday lives. Twenty-two in-depth interviews were conducted with elderly Chinese women aged 61 to 79. Qualitative analysis of the interview data yielded three meta-themes: information-seeking patterns, trustworthiness of health information, and peripheral route of decision making. Results revealed that elderly women took both systematic and heuristic approaches to processing information but relied on interpersonal networks to negotiate health choices. 相似文献
930.
Daniel Pérez-Garín Antonio Bustillos Fernando Molero 《Revista de Psicología Social》2017,32(2):276-300
Stereotype threat is a phenomenon by which members of a stereotyped group have their performance impaired when their group identity is made salient. Previous research has found that telling women about stereotype threat prevents impaired performance in mathematical tasks. Moreover, the effect of stereotype threat seems to be moderated by mathematical anxiety. The present work seeks (1) to test the effect of stereotype threat on women’s maths performance taking into account a previous maths score, (2) to replicate in a Spanish sample the protective effect of teaching intervention and (3) to test the moderator role of maths anxiety in the relationship between stereotype threat and impaired performance. Participants (110 undergraduate students) were randomly assigned to either stereotype threat or teaching intervention condition and the decrement in their performance was used as a dependent variable. Stereotype threat only impairs the performance of women with higher maths anxiety scores, and teaching intervention is effective to ameliorate this decrement in performance. We recommend the development of programmes that teach girls about stereotype threat and reduce mathematical anxiety. 相似文献