نتایج جستجو برای: real sample analysis

تعداد نتایج: 3478671  

2000
Yongwang Ding Ramesh Harjani Ron Cox

In this paper we propose a new analytical charge injection model. This model is completely general (i.e., it can be applied to any load condition) and models all regions of operation. The validity of the model has been verified via measurements from a fabricated design in a 0.5 CMOS process. Measurement results match extremely well with our model. The model is completely analytical and can be a...

2012
Canwei Xia Xuanlong Lin Wei Liu Huw Lloyd Yanyun Zhang

Acoustic identification is increasingly being used as a non-invasive method for identifying individuals within avian populations. However, most previous studies have utilized small samples of individuals (<30). The feasibility of using acoustic identification of individuals in larger avian populations has never been seriously tested. In this paper, we assess the feasibility of using distinct ac...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2011
Hinnerk Feldwisch-Drentrup Andreas Schulze-Bonhage Jens Timmer Björn Schelter

The prediction of events is of substantial interest in many research areas. To evaluate the performance of prediction methods, the statistical validation of these methods is of utmost importance. Here, we compare an analytical validation method to numerical approaches that are based on Monte Carlo simulations. The comparison is performed in the field of the prediction of epileptic seizures. In ...

2012
Takayuki Yamada Tetsuto Himeno

We proposed a test for assessing multivariate normality of the high-dimensional data which the dimension is larger than the sample size. The classical tests based on the sample measures of multivariate skewness and kurtosis defined by Mardia (1970) or Srivastava (1984) do not work for the high-dimensional case. The proposed test does not require explicit conditions on the relationship between t...

2014
Joanna IntHout John PA Ioannidis George F Borm

BACKGROUND The DerSimonian and Laird approach (DL) is widely used for random effects meta-analysis, but this often results in inappropriate type I error rates. The method described by Hartung, Knapp, Sidik and Jonkman (HKSJ) is known to perform better when trials of similar size are combined. However evidence in realistic situations, where one trial might be much larger than the other trials, i...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس - دانشکده علوم پزشکی 1391

تاکنون مکانیسم های پاتوفیزیولوژیک آسم خصوصا آسم غیرآتوپیک هنوز به طور کامل شناخته نشده اند. مطالعات مختلف نشان داده است که تغییر در دامنه و فرکانس نوسان طول عضله صاف ایزوله می تواند در تغییر نیروی ایزومتریک عضله نقش داشته باشد. در نتیجه ما فرض کردیم که تغییر الگوی تنفس می تواند در ایجاد افزایش پاسخدهی مجاری هوایی و بروز آسم غیرآتوپیک نقش داشته باشد. هدف از این مطالعه بررسی الگوی تنفس بیماران مب...

A simple and solvent-minimized sample preparation technique based on hollow fibre-protected liquid-phase micro-extraction has been developed for extraction of fifteen organic sulphur compounds from aqueous samples. The analysis of the extracted them was performed by gas chromatography equipped with mass spectrometry and/or flame photometric detectors. 3.3 µL of organic solvent located in the lu...

Journal: :Psicothema 2016
María D Hidalgo María D López-Martínez Juana Gómez-Benito Georgina Guilera

BACKGROUND Short scales are typically used in the social, behavioural and health sciences. This is relevant since test length can influence whether items showing DIF are correctly flagged. This paper compares the relative effectiveness of discriminant logistic regression (DLR) and IRTLRDIF for detecting DIF in polytomous short tests. METHOD A simulation study was designed. Test length, sample...

Journal: :Psychopharmacology bulletin 1998
J E Overall G Shobaki C Shivakumar J Steele

Statistical models for calculating sample sizes for controlled clinical trials often fail to take into account the negative impact that dropouts have on the power of intent-to-treat analyses. Empirically defined dropout correction coefficients are proposed to adjust sample sizes for endpoint analysis of variance (ANOVA) and analysis of covariance (ANCOVA) that have been initially calculated ass...

2017
Vincenzo Del Giudice Pierfrancesco De Paola Fabiana Forte

This paper experiments an artificial neural networks model with Bayesian approach on a small real estate sample. The output distribution has been calculated operating a numerical integration on the weights space with the Markov Chain Hybrid Monte Carlo Method (MCHMCM). On the same real estate sample, MCHMCM has been compared with a neural networks model (NNs), traditional multiple regression an...

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