نتایج جستجو برای: non parametric

تعداد نتایج: 1361026  

2005
J. WOLFOWITZ

In most statistical problems treated in the literature a datum of the problem is the information that the various distributions of the chance variables involved belong to given families of distribution functions (d.f.'s) completely specified except for one or more parameters. Non-parametric statistical inference is concerned with problems where the d.f.'s are not specified to such an extent, an...

2000
Giovanni Barone-Adesi Kostas Giannopoulos

1 VaR (Value at Risk) estimates are currently based on two main techniques, the variance-covariance approach or simulation. Statistical and computational problems affect the reliability of these techniques. We illustrate a new technique, filtered historical simulation, that is designed to remedy some of the shortcomings of the simulation approach. We compare the estimates it produces with tradi...

Journal: :Brazilian dental journal 2015
Alexandra M Queiroz Ariany B Carvalho Laís L Censi Carmen L Cardoso Christie R Leite-Panissi Raquel Assed Bezerra da Silva Fabricio Kitazono de Carvalho Paulo Nelson-Filho Lea Assed Bezerra da Silva

The aim of this study was to evaluate the transitory stress levels and the anxiety state in children submitted to conventional and computerized dental anesthesia. Twenty children (7 to 12 years) were randomly assigned to receive conventional and computerized dental anesthesia. To investigate the hypothesis that transitory stress could be lower after using computerized anesthesia compared to con...

2003
Mohammed Omran

The views expressed in this paper are those of the author and do not necessarily reflect the views of the Arab Monetary Fund. Abstract While it is well documented that privatization leads to an improvement in the performance of state-owned enterprises (SOEs) following divestiture, it is argued that many of these studies do not consider the performance of control firms of similar pre-privatizati...

2016
Abdelbaste Hrifach Coralie Brault Sandrine Couray-Targe Lionel Badet Pascale Guerre Christell Ganne Hassan Serrier Vanessa Labeye Pierre Farge Cyrille Colin

BACKGROUND The costing method used can change the results of economic evaluations. Choosing the appropriate method to assess the cost of organ recovery is an issue of considerable interest to health economists, hospitals, financial managers and policy makers in most developed countries. OBJECTIVES The main objective of this study was to compare a mixed method, combining top-down microcosting ...

2015
Hong Li Peijun Lyu Yuchun Sun Yong Wang Xiaoyue Liang

Micro-movement of human jaws in the resting state might influence the accuracy of direct three-dimensional (3D) measurement. Providing a reference for sampling frequency settings of intraoral scanning systems to overcome this influence is important. In this study, we measured micro-movement, or change in distance (∆d), as the change in position of a single tracking point from one sampling time ...

2004

Non-parametric paired analyses are approached through the same logic as the parametric paired t-tests: a 2 sample paired analysis can be reduced to a 1 sample test by creating a single distribution of the differences between each pair. If the distribution of the differences are nonnormal, and cannot be normalized by transforming the data to some other ratio scale, a 1 sample non-parametric test...

2008
Shujie Yao Zhongwei Han Genfu Feng

Since China joined the WTO in 2001, the pressure for bank reforms has mounted as China ought to fully open up its financial market to foreign competition by 2006. Efficiency is key for domestic banks to survive in a liberalised environment, but it appears that the last hope for raising bank efficiency is through ownership reform. Whether ownership reform and foreign competition can solve China’...

Journal: :Revista de saude publica 2007
Helene Mariko Ueno Oswaldo Paulo Forattini Ina Kakitani

OBJECTIVE Anopheles bellator e An. cruzii are vectors of the so-called bromeliad-malaria, typical of conserved areas. The objective was to evaluate the seasonal and vertical distribution of these anophelines, aiming at assessing the risk of malaria transmission. METHODS In the municipality of Ilha Comprida, Southeastern Brazil, CDC light traps baited with dry ice were placed fortnightly from ...

Journal: :American journal of ophthalmology 2009
Christina M R Kitchen

d t p d t A d n HE CHOICE OF STATISTICAL TEST HAS A PROFOUND impact on the interpretation of data. Understanding this choice is important for the critical evaluation of he biomedical literature. The question often arises hether to use nonparametric or parametric tests. The test is the most widely used statistical test for comparing he means of 2 independent groups. This parametric test ssumes t...

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