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121.
ABSTRACTPlanning for freight presents a perpetual challenge for governments. Understanding freight flows has attracted increasing research attention, though such knowledge can be difficult to translate to address problems in planning practice. This paper critically assesses the challenges of understanding and planning for urban freight movement, especially with reference to achieving more sustainable outcomes. In doing so, we elucidate guidance for broader analytical and policy approaches suited to meeting diverse public interest objectives. We review the literature with specific reference to the nature of policy problems, while collating existing conceptual knowledge for broad urban land use types. 相似文献
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In this article, we apply the simulated annealing algorithm to determine optimally spaced inspection times for the two-parameter Weibull distribution for any given progressive Type-I grouped censoring plan. We examine how the asymptotic relative efficiencies of the estimates are affected by the position of the monitoring points and the number of monitoring points used. A comparison of different inspection plans is made that will enable the user to select a plan for a specified quality goal. Using the same algorithm, we can also determine an optimal progressive Type-I grouped censoring plan when the inspection times and the expected proportions of total failures in the experiment are pre-fixed. Finally, we discuss the sample size and the acceptance constant of the progressively Type-I grouped censored reliability sampling plan when the optimal inspection times are used. 相似文献
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T. Timothy Chen Ph.D Richard M. Simon Ph.D Edward L. Kom Ph.D Stewart J. Anderson Ph.D Anne S. Lindblad Ph.D Harry Sam Wieand Ph.D 《统计学通讯:理论与方法》2013,42(6):1363-1378
A stochastic model wiuh exponential components is used to describe our data collected from a phase III cancer clinical trial. Criteria which guarantee that disease-free survival (DFS) can be used as a surrogate for overall survival are explored under this model. We examine several colorectal adjuvant clinical trials and find that these conditions are not satisfied. The relationship between the hazard ratio of DFS for an active treatment versus a control treatment and the cumulative hazard ratio of survival for the same two treatments is then explored. An almost linear relationship is found such that a hazard ratio for DFS of less than a threshold R corresponds to a non-null treatment effect on survival The threshold value R is determined for our colorectal adjuvant trial data. Based on this relationship, a one-sided test of equal hazard rate of survival is equivalent to a test of hazard ratio of DFS small than R This approach assumes that recurrence information is unbiasedly and accurately assessed; an assumpion which is sometimes difficult to ensure for multicenter clinical trials, particularly for interim analyses. 相似文献
124.
John E. Grable Sam Cupples Fred Fernatt NaRita Anderson 《Social indicators research》2013,114(3):1109-1124
Data from an economically and racially diverse sample (N = 258) was used to determine (a) if an association between objectively measured income and perceived income adequacy exists, (b) how well individuals assess the adequacy of their income, and (c) if a bias exists, can these estimates be used to describe a person’s overall level of financial satisfaction? Duesenberry’s (Income, saving, and the theory of consumer behavior. Harvard University Press, Cambridge, 1949) relative income hypothesis and Kyrk’s (The family in the American economy. University of Chicago Press, Chicago, 1953) resource deficit hypothesis were adopted for use as the conceptual framework for this study. A positive but modest association between objective and perceived income adequacy was noted. It was also found that individuals do not do a particularly good job of accurately assessing their income adequacy. Finally, perceived income adequacy estimation bias was found to be associated with financial satisfaction. Those who perceived their income to be deficient were less satisfied financially. Policy and practitioner implications from the study are discussed as a means for improving financial satisfaction at the individual and household level. 相似文献
125.
We describe and validate the Pacific Identity and Wellbeing Scale (PIWBS). The PIWBS is a culturally appropriate self-report measure assessing a five-factor model of Pacific identity and wellbeing. Items and construct definitions were developed through qualitative interviews, review of psychological theories, and previous research on Pacific concepts of ethnic identity and wellbeing. Exploratory and confirmatory factor analyses supported the model (Study 1 N = 143; Study 2 N = 443). The proposed five-factor model of Pacific identity and wellbeing includes scales assessing (1) Perceived Familial Wellbeing, (2) Perceived Societal Wellbeing, (3) Pacific Connectedness and Belonging, (4) Religious Centrality and Embeddedness, and (5) Group Membership Evaluation. The PIWBS provides a culturally appropriate valid and reliable assessment tool that can be used for within-cultural research for Pacific peoples from a Pacific perspective. A copy of the PIWBS and scoring instructions for its use are included. 相似文献
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Sam Efromovich 《Journal of statistical planning and inference》2011,141(12):3744-3752
For the case of a complete sample of univariate predictors and responses, the modern nonparametric regression matches results known for parametric and semiparametric regressions. The situation changes dramatically if some values in a sample are missing. This paper develops the theory of nonparametric regression for the classical case of responses missing at random. The main conclusion is that an adaptive estimator, based on a complete-case subsample, is asymptotically sharp minimax over all possible oracle-estimators that know: an underlying sample with missing responses; probability of observing the response given the predictor; smoothness of an underlying regression function; design density of the predictor; scale function of the regression error. 相似文献