نتایج جستجو برای: hotellings t2

تعداد نتایج: 30671  

2016
Mark van Rossum

Q: Consider an uncorrelated (white) Gaussian signal s(t). Calculate its 3rd and 4th order moments, m3 = ⟨s(t1)s(t2)s(t3)⟩ and m4 = ⟨s(t1)s(t2)s(t3)s(t4)⟩. Confirm with simulation. The third moment m3 = ⟨s(t1)s(t2)s(t3)⟩ is zero. Namely, if t1 ̸= t2 ̸= t3 then m3 = ⟨s⟩ = 03 = 0. If t1 = t2 = t3, m3 = ⟨ s3 ⟩ = ́ N (0, σ2)x3dx = 0, as this is the integral over an odd function. For t1 = t2 ̸= t3, m3 = ...

2015
Juliet Varghese Ning Jin Georgeta Mihai Orlando P Simonetti

Background T2 is sensitive to hemoglobin oxygen saturation (%HbO2). Non-invasive, rapid in-vivo quantification of %HbO2 based on the T2 of blood may be useful in patients with congenital heart disease. Although singleshot, T2-prepared SSFP enables rapid myocardial T2 quantification [1], flow sensitivity of the T2 preparation, especially at later echo times, may cause an underestimation of T2 va...

Journal: :Magnetic Resonance in Medicine 2018

Journal: :Topology and its Applications 1982

Journal: :Physics Letters A 1990

Journal: :Journal of High Energy Physics 2008

Journal: :Journal of Nonparametric Statistics 2022

Inspired by the cross-ratio proposed Clayton, we study a new risk ratio to describe relation between components of random vector (T1,T2). It is conditional hazard rate function T1 at t1, given that T2≥t2 and T2<t2. A nonparametric estimator its asymptotic distribution obtained using Bernstein smoothing for survival copula (T1,T2) derivatives. The finite sample performance studied via simulation...

2009
C. R. Chu

Introduction This clinical report assesses the feasibility of 3-D ultrashort echo time enhanced T2* (UTE-T2*) mapping of cartilage in vivo and examines the sensitivity of UTE-T2* to early cartilage degeneration compared to arthroscopic grading as the standard. UTE-T2* mapping is sensitive to changes in short-T2 signal (T2 <10ms) and may provide improved sensitivity to subtle matrix alterations,...

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