Results 251 to 260 of about 3,364,430 (292)

Product-limit survival functions with correlated survival times

Lifetime Data Analysis, 1995
A simple variance estimator for product-limit survival functions is demonstrated for survival times with nested errors. Such data arise whenever survival times are observed within clusters of related observations. Greenwood's formula, which assumes independent observations, is not appropriate in this situation.
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Memory Ordering of Survival Functions

Statistics, 1992
A new partial ordering among life distributions in terms of their memories of aging is introduced. The relationship between this ordering and various existing orderings of life distributions are discussed. For example, it is shown that there is no relationship between memory ordering and failure rate ordering.
N. B. Ebrahimi, Hassan Zahedi
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Cognitive functioning and survival in psychogeriatric patients

Acta Psychiatrica Scandinavica, 1991
The relationship between cognitive functioning and survival was studied among 92 people referred to a psychogeriatric assessment unit. A follow‐up 4–5 years later showed that the nonsurvivors initially had lower scores on the Mini‐Mental State Examination (MMSE) than the survivors.
S, Berg, L, Jeppson
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Survival Function

2016
Survival data arise when we are interested in the time of occurrence of an event, and the survival function describes the cumulative probability of surviving beyond a given time point in a given group of individuals. Methods to estimate the survival function can be classified in nonparametric and model-based methods and the main ones are described here.
REBORA, PAOLA, VALSECCHI, MARIA GRAZIA
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Survival, Reproduction, and Functional Efficiency

Philosophy of Science, 2019
The article examines the relationship between a trait’s effect on survival and reproduction and the notion of functional efficiency underlying the biostatistical theory of health (BST). BST faces the problem of how to measure a trait’s joint effect on survival and reproduction in its account of function. If one measures the joint effect by means of the
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FORM, FUNCTION, AND FITNESS: PATHWAYS TO SURVIVAL

Evolution, 2008
Two hypotheses have been considered in the literature regarding how anuran morphology reduces predation risk: by (1) improving escape swimming performance, or (2) using the tail as a lure to draw predator strikes away from the body of the tadpole. We investigated these hypotheses using a modification of the morphology, performance, and fitness path ...
Burt, Brent, Johnson, James B., DeWitt, Thomas J.   +2 more
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Cognitive functioning predicts survival in the elderly

Journal of Clinical and Experimental Neuropsychology, 2008
Prior studies of aging have identified a number of predictors of survival, including performances on some cognitive-functioning tests. However, few studies have used a multidomain test battery to identify which specific cognitive abilities predict death.
Duff, K., Mold, J., Gidron, Yori
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Sexual function of women surviving cervical cancer

Archives of Gynecology and Obstetrics, 2015
The objective of this study was to evaluate the sexual function of survivors of cervical cancer (CC) in comparison to the control group of women without a history of cancer.This was an observational, analytical, case-control study. In the cancer group, women subjected to CC treatment of at least 3 months in the past were included (n = 37).
Camila Soares Lima Corrêa, Isabel Cristina Gonçalves Leite, Anna Paula Silva Andrade, Adriana de Souza Sérgio Ferreira, Simone Meira Carvalho, Maximiliano Ribeiro Guerra   +5 more
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Motoneurone survival: a functional approach.

Trends in neurosciences, 1997
The role of the target in the survival of developing motoneurones is discussed. The contribution of neurotrophic factors is re-evaluated in view of the following: (1) motoneurone numbers are affected only slightly in transgenic mice following deletions of genes coding for neurotrophins or their receptors; and (2) continued treatment with neurotrophins ...
L, Greensmith, G, Vrbová
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Variance estimation of a survival function for interval‐censored survival data

Statistics in Medicine, 2001
AbstractInterval‐censored survival data often occur in medical studies, especially in clinical trials. In this case, many authors have considered estimation of a survival function. There is, however, relatively little discussion on estimating the variance of estimated survival functions. For right‐censored data, a special case of interval‐censored data,
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