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51.
A sequence of independent lifetimes X 1, X 2,…, X m , X m+1,… X n were observed from geometric population with parameter q 1 but later it was found that there was a change in the system at some point of time m and it is reflected in the sequence after X m by change in parameter q 2. The Bayes estimates of m, q 1, q 2, reliability R 1 (t) and R 2 (t) at time t are derived for symmetric and asymmetric loss functions under informative and non informative priors. A simulation study is carried out. 相似文献
52.
In this article, we derive the likelihood ratio tests (LRTs) for simultaneously testing interval hypotheses for normal means with known and unknown variances, and also with unknown but equal variance. Special cases when the interval hypotheses boil down to a point hypothesis are also discussed. Remarks regarding comparison of the LRT with tests based on combination of p-values are made, and several applications based on real data are mentioned. 相似文献
53.
Combinatorial estimation is a new area of application for sequential Monte Carlo methods. We use ideas from sampling theory to introduce new without-replacement sampling methods in such discrete settings. These without-replacement sampling methods allow the addition of merging steps, which can significantly improve the resulting estimators. We give examples showing the use of the proposed methods in combinatorial rare-event probability estimation and in discrete state-space models. 相似文献
54.
回族分布在全国各地,不同地区的回族文化又都具有所在区域的地方特色。福建泉州回族与西北回族在文化上有很大的差异。本文试图对福建泉州回族与西北回族作一比较,并对泉州回族汉化的原因作一探讨。 相似文献
55.
通过对铁路上海站和杭州东站的实地考察,以及问卷调查分析,着重探讨铁路车站设施现状与旅客游憩活动的需求关系,为进一步研究铁路车站旅游功能与模式的开发提供参考。 相似文献
56.
57.
Shah NM 《The International migration review》1995,29(4):1,000-1,022
This article describes changes in the volume, age and sex composition, retention, productivity, types of occupation, and economic sector of the labor force in Kuwait. The focus is on the structural changes in the indigenous labor force. Data were obtained from censuses and labor force surveys during 1965-93. Policies after the 1990 invasion pertained primarily to security of public employment sector among natives. Over 98% of private sector employment is among non-Kuwaitis. Government programs support high fertility. Female illiteracy has declined, and the proportion of women with a higher education has increased. Natives comprised 20.4% of the total labor force in 1993. About 90% of native males work in the public sector. 45% of total male employment is in the production sector. Around 50% of non-Kuwaiti males have been employed in production work over the decades. Over 90% of Kuwaiti females in 1993 worked in professional or clerical work. Over 50% of total female labor force participation is in the service sector. Concentration in the public sector increased for Kuwaitis and declined for non-Kuwaitis. Labor force participation declined with increasing age. Retirement benefits encouraged early retirement. The private sector is experiencing the departure of long-term migrants and more rapid turnover of labor. Hours of work are longer in the private sector. Kuwait is still dependent on foreign workers in the production and service industries. It is likely that native male workers will replace foreign workers in professional work and administrative/clerical work. Policies that will assure future reliance on imported labor include the assurance of government jobs for Kuwaitis, retirement rules, and the profitability of the trade in labor. 相似文献
58.
The unknown or unobservable risk factors in the survival analysis cause heterogeneity between individuals. Frailty models are used in the survival analysis to account for the unobserved heterogeneity in individual risks to disease and death. To analyze the bivariate data on related survival times, the shared frailty models were suggested. The most common shared frailty model is a model in which frailty act multiplicatively on the hazard function. In this paper, we introduce the shared gamma frailty model and the inverse Gaussian frailty model with the reversed hazard rate. We introduce the Bayesian estimation procedure using Markov chain Monte Carlo (MCMC) technique to estimate the parameters involved in the model. We present a simulation study to compare the true values of the parameters with the estimated values. We also apply the proposed models to the Australian twin data set and a better model is suggested. 相似文献
59.
K.R Shah 《统计学通讯:理论与方法》2013,42(9):3121-3124
In this note we present a simple procedure for obtaining combined estimates of treatment effects in row-column designs with adjusted orthogonality which are better than the fixed effects model estimates in the sense of having a smaller variance uniformly for all values of the variance components. 相似文献
60.
Brown and Cohen (1974) considered the problem of interval estimation of the common mean of two normal populations based on independent random samples. They showed that if we take the usual confidence interval using the first sample only and centre it around an appropriate combined estimate of the common mean the resulting interval would contain the true value with higher probability. They also gave a sufficient condition which such a point estimate should satisfy. Bhattacharya and Shah (1978) showed that the estimates satisfying this condition are nearly identical to the mean of the first sample. In this paper we obtain a stronger sufficient condition which is satisfied by many point estimates when the size of the second sample exceeds ten. 相似文献