نتایج جستجو برای: log rank test
تعداد نتایج: 932838 فیلتر نتایج به سال:
The log-rank conjecture states that the deterministic communication complexity of a Boolean function g (denoted by D(g)) is polynomially related to the logarithm of the rank of the communication matrixMg whereMg is the communication matrix defined byMg(x, y) = g(x, y). An XOR function F : {0, 1} × {0, 1} → {0, 1} with respect to f : {0, 1} → {0, 1} is a function defined by F (x, y) = f(x⊕ y). I...
BACKGROUND The independent prognostic impact, as well as the possible causal role, of hyperhomocysteinemia (HHcy) in coronary artery disease (CAD) is controversial. No previous study specifically has addressed the relationship between HHcy and mortality after coronary artery bypass grafting (CABG) surgery. The aim of this study is to evaluate the prognostic impact of HHcy after CABG surgery. ...
PURPOSE Elevated levels of human telomerase (hTERT) mRNA in tumors is a marker for poorer survival in patients with stage I non-small cell lung cancer (NSCLC). A functional variant of MNS16A-short tandem repeats in hTERT (S allele) is associated with higher expression levels of hTERT mRNA compared with the MNS16A-long (L) allele. It is unknown, however, whether or not the hTERT MNS16A variant g...
To assess the relationship between intestinal obstruction and the prognosis of rectal cancer. Data of 151 rectal cancer patients were extracted between January 2010 and October 2015 to survival analyse. The Kaplan-Meier method is used to survival analyse. The log-rank test was executed to compare the survival rate between patients with intestinal obstruction and those without intestinal obstruc...
BACKGROUND Undernutrition is common in older hospitalised patients, and routine screening is advocated. It is unclear whether screening tools such as the Birmingham Nutrition Risk (BNR) score and the Malnutrition Universal Screening Tool (MUST) can successfully predict outcome in this patient group. METHODS Consecutive admissions to Medicine for the Elderly assessment wards in Dundee were ass...
Purpose To investigate whether FGFR1 gene amplification is associated with clinicopathologic characteristics and its potential impact on survival in patients with resected esophageal squamous cell carcinoma (ESCC). Methods Five hundred fifty-six ESCC patients undergoing curative resection of ESCC were retrospectively studied. FGFR1 gene copy number was determined in microarrayed tumor samples...
We prove that any real matrix A contains a subset of at most 4k/ + 2k log(k + 1) rows whose span “contains” a matrix of rank at most k with error only (1 + ) times the error of the best rank-k approximation of A. We complement it with an almost matching lower bound by constructing matrices where the span of any k/2 rows does not “contain” a relative (1 + )-approximation of rank k. Our existence...
PURPOSE This study aimed to investigate early and mid-term outcomes of carotid artery stenting (CAS). METHODS We retrospectively reviewed 111 patients who were treated for carotid stenosis between October 2004 and December 2009 (42 CASs and 69 carotid endarterectomies [CEAs]). RESULTS CAS group was older than CEA group (70 years vs. 67 years, P = 0.001). Coronary artery disease and high les...
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