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71.
Bounded-width sequential confidence intervals and sequential tests for regression parameter based on M-estimators are extended to the case where the score-functions generating the M-estimators have jump-discontinuities. In the context of the asymptotic normality of the stopping variable, for the confidence interval problem, it is observed that the jump-discontinuities induce a slower rate of convergence. The proofs of the main theorems rest on the weak convergence of some related processes and this is also studied. 相似文献
72.
73.
The problem of multiple upper outlier detection in gamma sample is considered. Balasooriya and Gadag (1994) proposed a location and scale invariant test based on the test statistic Z k for testing the k upper outliers in two-parameter exponential sample. In this article, the test statistic is extended for gamma sample and the null distribution of the statistic is obtained. A simulation study is carried out to compare the performance of the tests and is found that the test based on Z k is more powerful than the test based on the test statistic proposed by Jabbari Nooghabi et al. (2010). 相似文献
74.
A new method of construction of orthogonal resolution IV designs for symmetrical and asymmetrical factorials has been presented. Many new series of orthogonal factorial designs of resolution IV can be obtained by the above general method. 相似文献
75.
Use of ranks in unequal probability sampling is examined for sample selection, stratification as well as determining the strata boundaries. A few sampling schemes are proposed and investigated, For samples of size two, two sampling schemes and their 1PPS versions are discussed, An extension of these schemes to general sample sizes is outlined. Nonnegative unbiased variance estimators are proposed in each case, An empirical comparison is included. 相似文献
76.
ABSTRACT Suppose independent random samples are available from k(k ≥ 2) exponential populations ∏1,…,∏ k with a common location θ and scale parameters σ1,…,σ k , respectively. Let X i and Y i denote the minimum and the mean, respectively, of the ith sample, and further let X = min{X 1,…, X k } and T i = Y i ? X; i = 1,…, k. For selecting a nonempty subset of {∏1,…,∏ k } containing the best population (the one associated with max{σ1,…,σ k }), we use the decision rule which selects ∏ i if T i ≥ c max{T 1,…,T k }, i = 1,…, k. Here 0 < c ≤ 1 is chosen so that the probability of including the best population in the selected subset is at least P* (1/k ≤ P* < 1), a pre-assigned level. The problem is to estimate the average worth W of the selected subset, the arithmetic average of means of selected populations. In this article, we derive the uniformly minimum variance unbiased estimator (UMVUE) of W. The bias and risk function of the UMVUE are compared numerically with those of analogs of the best affine equivariant estimator (BAEE) and the maximum likelihood estimator (MLE). 相似文献
77.
Arabin Kumar Dey 《Statistics》2013,47(2):197-214
Log-normal and Weibull distributions are the two most popular distributions for analysing lifetime data. In this paper, we consider the problem of discriminating between the two distribution functions. It is assumed that the data are coming either from log-normal or Weibull distributions and that they are Type-II censored. We use the difference of the maximized log-likelihood functions, in discriminating between the two distribution functions. We obtain the asymptotic distribution of the discrimination statistic. It is used to determine the probability of correct selection in this discrimination process. We perform some simulation studies to observe how the asymptotic results work for different sample sizes and for different censoring proportions. It is observed that the asymptotic results work quite well even for small sizes if the censoring proportions are not very low. We further suggest a modified discrimination procedure. Two real data sets are analysed for illustrative purposes. 相似文献
78.
This paper investigates the associations between preferred family size of women in rural Bihar, India and the fertility behaviours of their mother and mother-in-law. Scheduled interviews of 440 pairs of married women aged 16–34 years and their mothers-in-law were conducted in 2011. Preferred family size is first measured by Coombs scale, allowing us to capture latent desired number of children and then categorized into three categories (low, medium and high). Women’s preferred family size is estimated using ordered logistic regression. We find that the family size preferences are not associated with mother’s fertility but with mother’s education. Mother-in-law’s desired number of grandchildren is positively associated with women’s preferred family size. However, when the woman has higher education than her mother-in-law, her preferred family size gets smaller, suggesting that education provides women with greater autonomy in their decision-making on childbearing. 相似文献
79.
80.
Ashish Singh 《Population research and policy review》2011,30(6):861-883
Basic services which are essential for the overall development of a child should not depend on circumstances such as caste,
religion, gender, place of birth, or other parental characteristics, which are beyond his/her control. This paper uses two
rounds of Indian National Family Health Surveys and concepts of Inequality of Opportunity and Human Opportunity Indices to
measure inequality arising out of unequal coverage of full immunization and minimum nutrition for Indian children. The results
suggest overall high level of inequality of opportunity with substantial geographical variations. Changes in inequality of
opportunity in the two services during 1992–1993 to 2005–2006 were mixed with some geographical regions outperforming others.
The findings also call for substantial policy revisions if the goal of universal full immunization and minimum nutrition has
to be achieved. 相似文献