Results 301 to 310 of about 9,879,737 (342)

Testing the number of components in a normal mixture

, 2001
We demonstrate that, under a theorem proposed by Vuong, the likelihood ratio statistic based on the Kullback-Leibler information criterion of the null hypothesis that a random sample is drawn from a k 0 -component normal mixture distribution against the ...
Y. Lo, N. Mendell, D. Rubin
semanticscholar   +1 more source

Extension of life-span by introduction of telomerase into normal human cells.

Science, 1998
Normal human cells undergo a finite number of cell divisions and ultimately enter a nondividing state called replicative senescence. It has been proposed that telomere shortening is the molecular clock that triggers senescence.
A. Bodnar, M. Ouellette, Maria Frolkis, S. Holt, C. Chiu, G. Morin, C. Harley, J. Shay, S. Lichtsteiner, W. Wright   +9 more
semanticscholar   +1 more source

A class of distributions which includes the normal ones

, 1985
On introduit une nouvelle classe de fonctions de densite dependant du parametre de forme λ, telles que λ=0 corresponde a la densite normale ...
A. Azzalini
semanticscholar   +1 more source

On the ‘most normal’ normal

Communications in Numerical Methods in Engineering, 2007
AbstractGiven a set of normals in ℛ3, two algorithms are presented to compute the ‘most normal’ normal. The ‘most normal’ normal is the normal that minimizes the maximal angle with the given set of normals. A direct application is provided supposing a surface triangulation is available.
Romain Aubry, Rainald Löhner
openaire   +2 more sources

Normal backwardation is normal

Journal of Futures Markets, 2000
Traditionally, constant expected return asset pricing models are used to assess the presence of a futures risk premium and the validity of the normal backwardation theory. In the light of recent evidence regarding the presence of time variation in expected futures returns, such an approach may lead to incorrect inferences on the applicability of the ...
openaire   +2 more sources

Implications of normal brain development for the pathogenesis of schizophrenia.

Archives of General Psychiatry, 1987
Recent research on schizophrenia has demonstrated that in this disorder the brain is not, strictly speaking, normal. The findings suggest that nonspecific histopathology exists in the limbic system, diencephalon, and prefrontal cortex, that the pathology
D. Weinberger
semanticscholar   +1 more source

To normalize or not to normalize? Fat is the question

Environmental Toxicology and Chemistry, 1995
Abstract Concentrations of lipophilic contaminants in biota are frequently corrected for variation in tissue lipid content. Usually, this correction is accomplished by dividing tissue contaminant concentration by lipid concentration to form lipid-normalized data.
Karen A. Keenleyside, Craig E. Hebert
openaire   +2 more sources

Amblyopia: The Normal Eye is Not Normal

Journal of Pediatric Ophthalmology & Strabismus, 1990
ABSTRACT When acuity was used to evaluate amblyopia in children, the amblyopic eye had decreased acuity and the nonamblyopic eye had normal acuity. However when Contrast Sensitivity Functions (CSFs) were used to evaluate amblyopia, losses in the CSF were discovered in both the amblyopic and the nonamblyopic eyes.
Don L. Bremer, Lawrence E. Leguire, Gary L. Rogers   +2 more
openaire   +2 more sources

Can normal be more normal than normal?

Critical Care Medicine, 2010
To the Editor:We read with great interest the elegant study of Dr. Boerma et al (1) evaluating the effects of nitroglycerin on sublingual microcirculation in septic patients. However, we have serious concerns about the data analysis, which precludes definitive conclusions on the effectiveness, or ...
Can Ince, E. Christiaan Boerma
openaire   +4 more sources

The Skew-Normal and Related Families

, 2018
Interest in the skew-normal and related families of distributions has grown enormously over recent years, as theory has advanced, challenges of data have grown, and computational tools have made substantial progress.
A. Azzalini, A. Capitanio
semanticscholar   +1 more source