نتایج جستجو برای: calculated pearson coefficients of correlation
تعداد نتایج: 21194816 فیلتر نتایج به سال:
Purpose: Lesion volume is a meaningful measure in multiple sclerosis (MS) prognosis. Manual lesion segmentation for computing volume in a single or multiple time points is time consuming and suffers from intra and inter-observer variability. Methods: In this paper, we present MSmetrix-long: a joint expectation-maximization (EM) framework for two time point white matter (WM) lesion segmentation....
Neurophysiological studies are often designed to examine relationships between measures from different testing conditions, time points, or analysis techniques within the same group of participants. Appropriate statistical techniques that can take into account repeated measures and multivariate predictor variables are integral and essential to successful data analysis and interpretation. This wo...
PURPOSE To introduce a new method of deriving a virtual source model (VSM) of a linear accelerator photon beam from a phase space file (PSF) for Monte Carlo (MC) dose calculation. MATERIALS AND METHODS A PSF of a 6 MV photon beam was generated by simulating the interactions of primary electrons with the relevant geometries of a Synergy linear accelerator (Elekta AB, Stockholm, Sweden) and rec...
Similarity of gene expression profiles provides important clues for understanding the biological functions of genes, biological processes and metabolic pathways related to genes. A gene expression network (GEN) is an ideal choice to grasp such expression profile similarities among genes simultaneously. For GEN construction, the Pearson correlation coefficient (PCC) has been widely used as an in...
The benefits of four-dimensional computed tomography (4D CT) are limited by the presence of artifacts that remain difficult to quantify. A correlation-based metric previously proposed for ciné 4D CT artifact identification was further validated as an independent artifact evaluator by using a novel qualitative assessment featuring a group of observers reaching a consensus decision on artifact lo...
In this tutorial article, the concepts of correlation and regression are reviewed and demonstrated. The authors review and compare two correlation coefficients, the Pearson correlation coefficient and the Spearman rho, for measuring linear and nonlinear relationships between two continuous variables. In the case of measuring the linear relationship between a predictor and an outcome variable, s...
The purpose of this study is to examine the partial mediating effect epistemological beliefs in correlation between preferences towards educational philosophy and curriculum design approach pre-service teachers. For purpose, teachers’ preferences, orientation, have been analyzed, a model has developed. Three different instruments implemented randomly chosen 568 teachers several departments Neca...
The aim of the present study was to develop and validate a folate food frequency questionnaire (FFQ)1 designed to measure dietary folate equivalents. The self-administered FFQ containing 39 items and a reference period of 1 month (i.e. the previous month), was validated against three biomarkers: serum and erythrocyte (RBC) folate, and plasma homocysteine (Hcy). Subjects were women (n=99) betwee...
Introduction: Teeth can be used to determine age in forensic medicine if none of the other techniques of identification are appropriate. The researchers used panoramic radiographs from patients referred to Yazd Shahid Sadoughi Dental School to determine age using pulp/tooth perimeter ratio. Methods: In this diagnostic study, 800 panoramic digital radiographs were examined and the age of the pa...
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