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| Registros recuperados: 22 | |
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| Lallias, Delphine; Gomez-raya, L.; Haley, C. S.; Arzul, Isabelle; Heurtebise, Serge; Beaumont, A. R.; Boudry, Pierre; Lapegue, Sylvie. |
| We have identified quantitative trait loci (QTL) in the flat oyster (Ostrea edulis) for resistance to Bonamia ostreae, a parasite responsible for the dramatic reduction in the aquaculture of this species. An F-2 family from a cross between a wild oyster and an individual from a family selected for resistance to bonamiosis was cultured with wild oysters injected with the parasite, leading to 20% cumulative mortality. Selective genotyping of 92 out of a total of 550 F-2 progeny (i.e., 46 heavily infected oysters that died and 46 parasite-free oysters that survived) was performed using 20 microsatellites and 34 amplification fragment length polymorphism primer pairs. Both a two-stage testing strategy and QTL interval mapping methods were used. The two-stage... |
| Tipo: Text |
Palavras-chave: Statistical power; Survival analysis; QTL mapping; Disease resistance; Ostrea edulis. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6682.pdf |
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| Hosmer, David W.; Royston, Patrick. |
| In this paper, we describe a new Stata command, stlh, which estimates and tests for the significance of the time-varying regression coefficients in Aalen’s linear hazards model; see Aalen (1989). We see two potential uses for this command. One may use it as an alternative to a proportional hazards or other nonlinear hazards regression model analysis to describe the effects of covariates on survival time. A second application is to use the command to supplement a proportional hazards regression model analysis to assist in detecting and then describing the nature of time-varying effects of covariates through plots of the estimated cumulative regression coefficients, with confidence bands, from Aalen’s model. We illustrate the use of the command to perform... |
| Tipo: Journal Article |
Palavras-chave: Survival analysis; Survival-time regression models; Time-to-event analysis; Research Methods/ Statistical Methods. |
| Ano: 2002 |
URL: http://purl.umn.edu/116019 |
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| Fewell, Zoe; Hernan, Miguel A.; Wolfe, Frederick; Tilling, Kate; Choi, Hyon; Sterne, Jonathan A.C.. |
| Longitudinal studies in which exposures, confounders, and outcomes are measured repeatedly over time have the potential to allow causal inferences about the effects of exposure on outcome. There is particular interest in estimating the causal effects of medical treatments (or other interventions) in circumstances in which a randomized controlled trial is difficult or impossible. However, standard methods for estimating exposure effects in longitudinal studies are biased in the presence of time-dependent confounders affected by prior treatment. This article describes the use of marginal structural models (described by Robins, Hernán, and Brumback [2000]) to estimate exposure or treatment effects in the presence of time-dependent confounders affected by... |
| Tipo: Journal Article |
Palavras-chave: Marginal structural models; Causal models; Weighted regression; Survival analysis; Logistic regression; Confounding; Research Methods/ Statistical Methods. |
| Ano: 2004 |
URL: http://purl.umn.edu/116267 |
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| Woldehanna, Tassew; Jones, Nicola; Tefera, Bekele. |
| A combination of quantitative and qualitative method was used to analyse the determinants of school completion/dropout of children from primary education. A Cox box proportional hazard model was used analyse the survival of children in primary education. The findings have important implications for the formulation and revising Ethiopian Poverty Reduction Strategy Paper. While the policy focus of the 1996-initiated ESDP and the SDPRP (2002-5) on increasing educational access for all has been broadly successful, children from poor and/or highly indebted families still face significant constraints because they have to contribute to household survival through paid and unpaid work. It is therefore imperative to increase efforts to improve the livelihood options... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Education; Children; Ethiopia; PRSP; Poverty; Survival analysis; Labor and Human Capital; A2; D1; J2. |
| Ano: 2006 |
URL: http://purl.umn.edu/25351 |
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| Guan, Weihua; Gutierrez, Roberto G.. |
| With the release of Stata 7, the glm command for fitting generalized linear models underwent a substantial overhaul. Stata 7 glm contains an expanded array of variance estimators, regression diagnostics, and other enhancements. The overhaul took place to coincide with the release of Hardin and Hilbe (2001). With the new glm came a modular design that enables users to program customized link functions, variance functions, and weight functions to be used if Newey-West covariance estimates are desired. Because cases requiring customized link functions are the more prevalent in the literature, only those are considered here. We give two examples where a nonstandard link function is required: the relative survival model of Hakulinen and Tenkanen (1987) and a... |
| Tipo: Journal Article |
Palavras-chave: GLM; Survival analysis; Cox regression; Programming; Research Methods/ Statistical Methods. |
| Ano: 2002 |
URL: http://purl.umn.edu/116023 |
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| Luna-Palomera,Carlos; Ojeda-Robertos,Nadia Florencia; Peralta-Torres,Jorge Alonso; Macías-Cruz,Ulises; Sánchez-Dávila,Fernando; Segura-Correa,José Candelario. |
| ABSTRACT We evaluated the effect of some environmental factors on age at first lambing (AFL) and lambing to conception interval (LCI) of Pelibuey ewes under the humid tropical conditions of Mexico. Ewes grazed on Tanzania (Panicum maximum), Bermuda (Cynodon dactylon), and Brachiaria grass (Brachiaria humidicola) and received hay in the corral in the months of grass scarcity. Reproduction was continuous during the year. Data of 839 lambings from 334 ewes registered from 2009 to 2017 were analyzed using survival analysis procedures. The statistical model for AFL included the effects of year, season, and litter size at lambing, whereas that for LCI included year and season plus parity number of ewe and litter size at weaning. The overall means ± SD for AFL... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Age at first lambing; Lambing to conception interval; Parity number; Tropics; Survival analysis. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100600 |
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| CUEVAS,JAIME G; SILVA,SERGIO I; LEÓN-LOBOS,PEDRO; GINOCCHIO,ROSANNA. |
| Positive interactions among plants, such as the nurse effect, can attenuate environmental stress (e.g., drought) or reduce the intensity of perturbations (e.g., herbivory), thus enhancing the possibility of regeneration in natural systems. This study analyses the potential use of nurse plants for restoring artificial environments, such as mine hard-rock dumps. We evaluated seedling recruitment and survival in open areas and beneath the canopy of nurse shrubs, with and without grazing exclusion, on an abandoned copper tailings storage facility in north-central Chile. The nurse species was Baccharis linearis (Asteraceae), and seedling species were B. linearis, Haplopappus parvifolius (Asteraceae), Schismus arabicus (Poaceae), and several forb/grass taxa. A... |
| Tipo: Journal article |
Palavras-chave: Baccharis linearis; Haplopappus parvifolius; Hard rock waste; Primary succession; Survival analysis. |
| Ano: 2013 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2013000100006 |
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| VILELA,LIANA M.; CARLO,RICARDO J. DEL; Melo FILHO,EDSON V.; FAVARATO,LUKIYA S.C.; DUARTE,TATIANA S.; PONTES,KELLY C.S.; CUNHA,DAISE N.Q.. |
| This study evaluated the technique for meniscal allograft transplantation using allografts preserved in glycerin 98% in rabbits. Euthanasia was performed at 70 days to compare the transplanted (TM1 to TM16) versus the contralateral meniscus (OM1 to OM16). Sixteen menisci, 8 transplanted and 8 contralateral, were submitted to gross examination, histomorphometric analysis for identification and quantification of cellular type, and for quantification and distribution of collagen fibers. A revascularization study was conducted in all of the other samples. Lengths of the OM varied from 0.9 to 1.0 cm and two TM were smaller. All TM were completely attached to the synovial membrane, except for one case that presented partial fixation. Both, TM and OM had similar... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Knee; Meniscal allograft; Survival analysis; Transplantation; Revascularization. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502205 |
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| Portella,Augustus Caeser Franke; Karp,Susan; Scheidt,Gessiel Newton; Woiciechwski,Adenise Lorenci; Parada,Jose Luis; Soccol,Carlos Ricardo. |
| This work presents a statistical model of survival analysis for three pathogenic bacterial strains (Escherichia coli, Listeria monocytogenes and Staphylococcus aureus), when treated with neutralized and non-neutralized filtered supernatants broth from cultures of Lactobacillus acidhophilus, Lactobacillus rhamnosus and Lactobacillus sake. Survival analysis is a method employed to determine the period of time from an initial stage up to the occurrence of a particular event of interest, as death or a particular culture growth failure. In order to evaluate the potential efficacy of the ahead mentioned lactic acid bacteria when used as bioprotective starters in foods, experimental data were statistically treated and expressed by simple representative curves.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Statistical model; Survival analysis; Bioprotection. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000700004 |
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| Alencar,Wong Kuen; Duarte,Paulo Schiavom; Waldman,Eliseu Alves. |
| INTRODUCTION:Survival of patients with acquired immune deficiency syndrome has improved with combination antiretroviral therapy; mortality due to liver diseases, however, has also increased in these patients.OBJECTIVES:To estimate the accumulated probability of survival in human immunodeficiency virus-hepatitis C virus coinfected and non-coinfected patients and to investigate factors related to acquired immune deficiency syndrome patients' survival.METHODS:Non-concurrent cohort study using data from surveillance information systems of acquired immune deficiency syndrome patients over 13 years of age. Hepatitis C and B, human immunodeficiency virus exposure category, CD4+ T cell count, age group, schooling, race, sex, and four acquired immune deficiency... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: HIV; Acquired immunodeficiency syndrome; Hepatitis viruses; Survival analysis. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702014000200150 |
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| Registros recuperados: 22 | |
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