نتایج جستجو برای: skewness
تعداد نتایج: 4036 فیلتر نتایج به سال:
PURPOSE In an effort for early assessment of treatment response, we investigate radiation induced changes in quantitative CT features of tumor during the delivery of chemoradiation therapy (CRT) for pancreatic cancer. METHODS Diagnostic-quality CT data acquired daily during routine CT-guided CRT using a CT-on-rails for 20 pancreatic head cancer patients were analyzed. On each daily CT, the pa...
Skewness is often present in a wide range of applied problems. One possible approach to model this skewness is based on the class of skew normal distributions. Fitting such distributions remains an inference challenge in various cases. In this paper, we propose and study novel estimators using weighted moments for the closed multivariate skew-normal distribution.
In the statistical point of view, skewness longitudinal velocity gradient is usually related to energy transfer in turbulence, for example, Kolmogorov forward cascade fully developed turbulence implies negative skewness, while Gaussian random noise and infinitesimal perturbations lead zero skewness. We show by two DNS cases that, early transition stage, can be positive, contrast equilibrium tur...
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