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21.
In this paper we consider the problem of estimating the reliability of an exponential component based on a Ranked Set Sample (RSS) of size n. Given the first r observations of that sample, 1≤r≤n, we construct an unbiased estimator for this reliability and we show that these n unbiased estimators are the only ones in a certain class of estimators. The variances of some of these estimators are compared. By viewing the observations of the RSS of size n as the lifetimes of n independent k-out-of-n systems, 1≤k≤n, we are able to utilize known properties of these systems in conjunction with the powerful tools of majorization and Schur functions to derive our results. 相似文献
22.
There is a considerable amount of literature dealing with inference about the parameters in a heteroscedastic one-way random-effects ANOVA model. In this paper, we primarily address the problem of improved quadratic estimation of the random-effect variance component. It turns out that such estimators with a smaller mean squared error compared with some standard unbiased quadratic estimators exist under quite general conditions. Improved estimators of the error variance components are also established. 相似文献
23.
This paper deals with the analysis of multivariate survival data from a Bayesian perspective using Markov-chain Monte Carlo methods. The Metropolis along with the Gibbs algorithm is used to calculate some of the marginal posterior distributions. A multivariate survival model is proposed, since survival times within the same group are correlated as a consequence of a frailty random block effect. The conditional proportional-hazards model of Clayton and Cuzick is used with a martingale structured prior process (Arjas and Gasbarra) for the discretized baseline hazard. Besides the calculation of the marginal posterior distributions of the parameters of interest, this paper presents some Bayesian EDA diagnostic techniques to detect model adequacy. The methodology is exemplified with kidney infection data where the times to infections within the same patients are expected to be correlated. 相似文献
24.
Samiran Ghosh 《Statistics and Computing》2011,21(3):451-462
Lasso proved to be an extremely successful technique for simultaneous estimation and variable selection. However lasso has
two major drawbacks. First, it does not enforce any grouping effect and secondly in some situation lasso solutions are inconsistent
for variable selection. To overcome this inconsistency adaptive lasso is proposed where adaptive weights are used for penalizing
different coefficients. Recently a doubly regularized technique namely elastic net is proposed which encourages grouping effect
i.e. either selection or omission of the correlated variables together. However elastic net is also inconsistent. In this
paper we study adaptive elastic net which does not have this drawback. In this article we specially focus on the grouped selection
property of adaptive elastic net along with its model selection complexity. We also shed some light on the bias-variance tradeoff
of different regularization methods including adaptive elastic net. An efficient algorithm was proposed in the line of LARS-EN,
which is then illustrated with simulated as well as real life data examples. 相似文献
25.
Jason Burnett PhD Shelly L. Jackson PhD Arup K. Sinha MS Andrew R. Aschenbrenner BS MS Kathleen Pace Murphy PhD Rui Xia PhD 《Journal of elder abuse & neglect》2013,25(2):59-75
ABSTRACTElder abuse increases the likelihood of early mortality, but little is known regarding which types of abuse may be resulting in the greatest mortality risk. This study included N = 1,670 cases of substantiated elder abuse and estimated the 5-year all-cause mortality for five types of elder abuse (caregiver neglect, physical abuse, emotional abuse, financial exploitation, and polyvictimization). Statistically significant differences in 5-year mortality risks were found between abuse types and across gender. Caregiver neglect and financial exploitation had the lowest survival rates, underscoring the value of considering the long-term consequences associated with different forms of abuse. Likewise, mortality differences between genders and abuse types indicate the need to consider this interaction in elder abuse case investigations and responses. Further mortality studies are needed in this population to better understand these patterns and implications for public health and clinical management of community-dwelling elder abuse victims. 相似文献
26.
Summary Population dynamics and aggregation patterns of nine kinds of stored-grain mites were studied in two 7.5 tonne lots of hulled
(cv. Random) and hulless (cv. Terra) oat cultivars with 12–14% moisture content stored in two wooden bins in Manitoba, Canada
during 1978–84. Random oats harbored more mites than Terra oats.Lepidoglyphus destructor Schrank was the most common granivorous mite andCheyletus eruditus Shrank the most common predatory mite. Ecological data on a tydeid mite,Paratriophtydeus coineaui André, are presented for the first time. Because they were more abundant in Terra oats with higher fat acidity values (FAV)
than Random oats with lower FAVs,L. destructor andTarsonemus granarius Lindquist could be used as bioindicators of spoilage of stored oats. All species analyzed showed some significant difference
in their abundance at different depths in the grain bulk; some species showed depthxtime interaction. Aggregation patterns
indicated most mite species had overdispersed (clumped) distribution.T. granarius, andBlattisocius keegani Fox-Androlaelaps casalis Berlese had a distinct aggregation pattern in each oat cultivar.
Contribution No. 1373 from Agriculture Canada Research Station, Winnipeg, Manitoba, Canada R3T 2M9 相似文献
27.
Alam Khurshid Maity Arnab Sinha Sanjoy K. Rizopoulos Dimitris Sattar Abdus 《Lifetime data analysis》2021,27(1):64-90
Lifetime Data Analysis - In this paper, we propose an innovative method for jointly analyzing survival data and longitudinally measured continuous and ordinal data. We use a random effects... 相似文献
28.
Sahu Sujit K. Dey Dipak K. Aslanidou Helen Sinha Debajyoti 《Lifetime data analysis》1997,3(2):123-137
Frequently in the analysis of survival data, survival times within the same group are correlated due to unobserved co-variates.
One way these co-variates can be included in the model is as frailties. These frailty random block effects generate dependency
between the survival times of the individuals which are conditionally independent given the frailty. Using a conditional proportional
hazards model, in conjunction with the frailty, a whole new family of models is introduced. By considering a gamma frailty
model, often the issue is to find an appropriate model for the baseline hazard function. In this paper a flexible baseline
hazard model based on a correlated prior process is proposed and is compared with a standard Weibull model. Several model
diagnostics methods are developed and model comparison is made using recently developed Bayesian model selection criteria.
The above methodologies are applied to the McGilchrist and Aisbett (1991) kidney infection data and the analysis is performed
using Markov Chain Monte Carlo methods.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
29.
Psychology, Education and the Ghost of Kaspar Hauser 总被引:1,自引:1,他引:0
Chris Sinha 《Disability & Society》1986,1(3):245-259
It is argued that the interventions of psychology have changed their predominant goals and orientation in recent times. Previously, psychology operated practices of differentiation within the school population, preserving the 'normal' through the exclusion of the deviant. Now, the predominant orientation is one of normalisation. The ideology of normalisation is shown to 'fit' with the generalities of the 'new', social-critical developmental psychology; but the predominant model for the implementation of normalisation practices utilises behavioural pedagogies and objectives-based curricula. The question is considered of whether there might be a social-developmental alternative. 相似文献
30.
Credible and highest posterior density intervals for the reliability function and parameters of a two-parameter Weibull process are obtained and the estimates compared with their corresponding classical counterparts. 相似文献