Now showing items 31-40 of 2875
Log-Burr XII regression models with censored data
(ELSEVIER SCIENCE BV, 2008)
In survival analysis applications, the failure rate function may frequently present a unimodal shape. In such case, the log-normal or log-logistic distributions are used. In this paper, we shall be concerned only with ...
Progression of liver fibrosis in blood donors infected with hepatitis C virus
Background/Aims. Chronic hepatitis by HCV is progressive towards cirrhosis, with variable rate. We evaluated the rate of fibrosis progression (RFP), risk factors associated with advanced fibrosis (F3 and F4), and estimated ...
Ductal carcinoma in situ in core needle biopsies and its association with extensive in situ component in the surgical specimen
Background: We evaluated the presence of ductal carcinoma in situ (DCIS) in core needle biopsies (CNB) from invasive ductal lesions. Methods: Retrospective study, which analyzed 90 cases of invasive ductal carcinoma lesions. ...
Factors predicting the need for insulin therapy in patients with gestational diabetes mellitus
(ELSEVIER IRELAND LTD, 2010)
Aim: To determine the possible factors predicting the insulin requirement in pregnancies complicated by gestational diabetes mellitus (GDM). Method: A total of 294 patients with GDM diagnosed by the 100-g/3-h oral glucose ...
ESTRUTURA E RELAÇÕES AMBIENTAIS DE GRUPOS FLORÍSTICOS EM FRAGMENTO DA FLORESTA OMBRÓFILA MISTA, RIO GRANDE DO SUL, BRASIL
(Universidade Federal de Santa MariaBRRecursos Florestais e Engenharia FlorestalUFSMPrograma de Pós-Graduação em Engenharia Florestal, 2012-03-02)
This study was developed in a fragment of Mixed Ombrophylous Forest, located on National Forest of São Francisco de Paula in the state of Rio Grande do Sul, aiming to verify the formation of floristic groups and to ...
Residuals for log-Burr XII regression models in survival analysis
(ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD, 2011)
In this paper, we compare three residuals to assess departures from the error assumptions as well as to detect outlying observations in log-Burr XII regression models with censored observations. These residuals can also ...