全文获取类型
收费全文 | 694篇 |
免费 | 14篇 |
国内免费 | 1篇 |
专业分类
管理学 | 68篇 |
民族学 | 4篇 |
人口学 | 108篇 |
丛书文集 | 2篇 |
理论方法论 | 28篇 |
综合类 | 27篇 |
社会学 | 223篇 |
统计学 | 249篇 |
出版年
2023年 | 7篇 |
2022年 | 3篇 |
2021年 | 5篇 |
2020年 | 7篇 |
2019年 | 17篇 |
2018年 | 16篇 |
2017年 | 34篇 |
2016年 | 22篇 |
2015年 | 11篇 |
2014年 | 17篇 |
2013年 | 134篇 |
2012年 | 30篇 |
2011年 | 19篇 |
2010年 | 19篇 |
2009年 | 18篇 |
2008年 | 17篇 |
2007年 | 25篇 |
2006年 | 9篇 |
2005年 | 8篇 |
2004年 | 10篇 |
2003年 | 11篇 |
2002年 | 8篇 |
2001年 | 11篇 |
2000年 | 12篇 |
1999年 | 4篇 |
1998年 | 11篇 |
1997年 | 7篇 |
1996年 | 6篇 |
1995年 | 6篇 |
1994年 | 10篇 |
1993年 | 8篇 |
1992年 | 13篇 |
1991年 | 5篇 |
1990年 | 7篇 |
1989年 | 11篇 |
1988年 | 15篇 |
1987年 | 10篇 |
1986年 | 12篇 |
1985年 | 4篇 |
1984年 | 12篇 |
1983年 | 12篇 |
1982年 | 15篇 |
1981年 | 13篇 |
1980年 | 16篇 |
1979年 | 5篇 |
1978年 | 6篇 |
1977年 | 5篇 |
1976年 | 6篇 |
1973年 | 4篇 |
1968年 | 4篇 |
排序方式: 共有709条查询结果,搜索用时 15 毫秒
71.
Occupational therapy practitioners offer services to workers in the workplace to prevent musculoskeletal disorders (MSDs), to help the injured worker restore function, and to recover capacities needed to return to the job. Despite the existence of some evidence about the efficacy of prevention programs, there is uncertainty and even disagreement among health professionals, about the outcome of prevention programs for people with MSDs. It is proposed that principles of motor learning can assist the therapist in structuring prevention programs to facilitate the workers learning of correct movement patterns. This paper discusses basic concepts of motor learning emphasizing characteristics of the learner, the type of task, the structure of practice and application to prevention programs at work settings. We present a four-stage model for prevention programs based on principles of both motor learning and ergonomics. This model coincides with the broad perspective suggested in current occupational therapy models which focuses on the person, the environment, the occupation and their effects on occupational performance. 相似文献
72.
73.
Richard Z. Gooding 《Evaluation and program planning》1980,3(2):95-103
Evaluation methodologies have generally emphasized the measurement and assessment of program merit, as reflected by the achievement of program objectives. Less attention has been devoted to analyzing and explaining the reasons for deficient performance and, more importantly, what needs to be modified to improve performance. While evaluators do identify performance problems, the identified problems are not always analyzed. Consequently, the information reported to decision makers may be incomplete, inconclusive, and of limited utility in the decision-making process. This article describes an evaluation methodology based on problem solving techniques which can be effective and efficient in defining and analyzing problems which impair program performance. The model can be applied in evaluations where the purpose is to provide decision makers with information and recommendations to improve program performance and provide an alternative to those evaluation models which emphasize the assessment of program merit. The model also provides a potentially unique cost/benefit methodology for estimating the potential worth of improving program performance (i.e., solving the problem). 相似文献
74.
Problems of population aging in China are considered in the light of the adoption of a policy of one child per family. The possibility of inadequate labor force resources and a ratio of elderly population too great for those of working age is considered. Methods of estimating population age structure are presented, and the economic problems of both aging and youthful populations are discussed. 相似文献
75.
Z. A. Abo-Eleneen 《统计学通讯:理论与方法》2013,42(5):682-691
Recently, progressively Type II censored samples have attracted attention in the study and analysis of life-testing data. Here we propose an indirect approach for computing the Fisher information (FI) in progressively Type II censored samples that simplifies the calculations. Some recurrence relations for the FI in progressively Type II censored samples are derived that facilitate the FI computation using the proposed decomposition. This paper presents a standard recurrence relation that simplifies computation of the FI in progressively Type II censored samples to a sum; FI in collections order statistics (OS). We compute the FI in a collections of progressively Type II censored samples for some known distributions. 相似文献
76.
Process capability indices are routinely used in manufacturing industries for process monitoring. A basic assumption while using process capability indices is that there are no assignable causes of variation present. However, when variation due to an assignable cause is present and is tolerated, the conventional methods of capability measurement become inaccurate. In this article, we suggest an estimate of Cpk assuming that the process capability changes dynamically. We obtain an exact form of the sampling distribution in the presence of a systematic assignable cause. We discuss the problem of testing whether a given process is capable. The critical values for different sample sizes are obtained based on the sampling distribution. An example involving tool wear problem is presented. 相似文献
77.
Inferential analysis for the reliability parameter based on the three-parameter Lindley distribution
ABSTRACTIn this article, we consider the estimation of R = P(Y < X), when Y and X are two independent three-parameter Lindley (LI) random variables. On the basis of two independent samples, the modified maximum likelihood estimator along its asymptotic behavior and conditional likelihood-based estimator are used to estimate R. We also propose sample-based estimate of R and the associated credible interval based on importance sampling procedure. A real life data set involving the times to breakdown of an insulating fluid is presented and analyzed for illustrative purposes. 相似文献
78.
Abstract The multivariate elliptically contoured distributions provide a viable framework for modeling time-series data. It includes the multivariate normal, power exponential, t, and Cauchy distributions as special cases. For multivariate elliptically contoured autoregressive models, we derive the exact likelihood equations for the model parameters. They are closely related to the Yule-Walker equations and involve simple function of the data. The maximum likelihood estimators are obtained by alternately solving two linear systems and illustrated using the simulation data. 相似文献
79.
Mohammad Z. Raqab 《统计学通讯:理论与方法》2013,42(7):1367-1380
In this article, we obtain sharp distribution-free bounds for the expected value of the gap between the current records and record values as well as upper sharp bounds for the spacings between any two upper current records. We also present two-sided bounds on the errors in approximating the means of current records by inverse hazard functions. 相似文献
80.
Mohammad Z. Raqab 《Statistics》2013,47(1):29-41
In this paper, we consider the generalized exponential distribution (GED) with shape parameter α. We establish several recurrence relations satisfied by the single and the product moments for order statistics from the GED. The relationships can be written in terms of polygamma and hypergeometric functions and used in a simple recursive manner in order to compute the single and the product moments of all order statistics for all sample sizes. 相似文献