نتایج جستجو برای: missing value

تعداد نتایج: 789746  

Journal: :journal of paramedical sciences 0
mahmood alipour heidari department of biostatistics, faculty of medical sciences, tarbiat modares university,tehran hamid alavi majd department of biostatistics, faculty of paramedical sciences, shahid beheshti university of medical sciences,tehran ebrahim hajizadeh department of biostatistics, faculty of medical sciences, tarbiat modares university,tehran kamal azam department of epidemiology and biostatistics, school of public health, tehran university of medical sciences,tehran mohammad reza zali research institute for gastroenterology and liver disease, shahid beheshti university of medical sciences,tehran

the relation between single nucleotide polymorphisms (snps) and some diseases has been concerned by many researchers. also the missing snps are quite common in genetic association studies. hence, this article investigates the relation between existing snps in dnmt1 of human chromosome 19 with colorectal cancer. this article aims is to presents an imputation method for missing snps not at random...

Journal: :International Journal of Computer Applications 2014

Journal: :Journal of Targeting, Measurement and Analysis for Marketing 2005

Journal: :Knowledge Based Systems 2023

A missing value indicates that a particular attribute of an instance learning problem is not recorded. They are very common in many real-life datasets. In spite this, however, most machine methods cannot handle values. Thus, they should be imputed before training. Gaussian Processes (GPs) non-parametric models with accurate uncertainty estimates combined sparse approximations and stochastic var...

Journal: :Molecular Biology and Evolution 2006

Journal: :International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems 2008
Francisco Chiclana Enrique Herrera-Viedma Sergio Alonso Francisco Herrera

Dealing with incomplete information is an important problem in decision making. In this paper, we present a short discussion on this topic and a new estimation method of missing values in an incomplete fuzzy preference relation which is based on the modelling of consistency of preferences via a representable uninorm.

2009
Song Xi Chen Ping-Shou Zhong S. X. CHEN P. S. ZHONG

We carry out an ANOVA analysis to compare multiple treatment effects for longitudinal studies with missing values. The treatment effects are modeled semiparametrically via a partially linear regression which is flexible in quantifying the time effects of treatments. The empirical likelihood is employed to formulate nonparametric ANOVA tests for treatment effects with respect to covariates and t...

Multivariate time series data are found in a variety of fields such as bioinformatics, biology, genetics, astronomy, geography and finance. Many time series datasets contain missing data. Multivariate time series missing data imputation is a challenging topic and needs to be carefully considered before learning or predicting time series. Frequent researches have been done on the use of diffe...

2005
Muhammad Shoaib B. Sehgal Iqbal Gondal Laurence S. Dooley

Motivation: Microarray data is used in a range of application areas in biology, though often it contains considerable numbers of missing values. These missing values can significantly affect subsequent statistical analysis and machine learning algorithms so there is a strong motivation to estimate these values as accurately as possible prior to using these algorithms. While many imputation algo...

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