OBJECTIVE To analyze adherence to the recommended iron, zinc and multivitamin supplementation guidelines for preemies, the factors associated with this adherence, and the influence of adherence on the occurrence of anemia and iron, zinc and vitamin A deficiencies. METHODS This prospective cohort study followed 58 preemies born in 2014 until they reached six months corrected age. The preemies ...

Instrumental variable estimates of causal effects can be biased when using many instruments that are only weakly associated with the exposure. We describe several techniques to reduce this bias and estimate corrected standard errors. We present our findings using a simulation study and an empirical application. For the latter, we estimate the effect of height on lung function, using genetic var...

Regression models based on the log-symmetric family of distributions are particularly useful when response variable is continuous, positive, and asymmetrically distributed. In this article, we propose derive a class new approach to quantile regression using parameterized by means their quantiles. Two Monte Carlo simulation studies conducted utilizing R software. The first one analyzes performan...

Abstract Confidence interval for the difference of two proportions has been studied decades. Many methods were developed to improve approximation limiting distribution test statistics, such as profile likelihood method, score and Wilson method. For by Beal (Biometrics 43:941, 1987), Z statistic standard normal may be further improved utilizing continuity correction, in observation anti-conserva...

Little is documented about the determinants of developmental outcomes for medically fragile infants who receive early intervention. In this controlled longitudinal study 65 premature infants with intraventricular hemorrhage (IVH) were randomly assigned to intervention groups beginning at 3 months adjusted age (Early) or 12 months adjusted age (Delayed). The sample was 65% African American and 3...

Yazışma Adresi / Address for Correspondence: Kadir Şerafettin Tekgündüz, Atatürk Üniversitesi Tıp Fakültesi, Yenidoğan Hastalıkları, Erzurum, Türkiye. E-posta / E-mail: [email protected] Geliş Tarihi / Received: 26.01.2015 Kabul Tarihi / Accepted: 13.02.2015 ©Telif Hakkı 2015 Türk Pediatri Kurumu Derneği Makale metnine www.turkpediatriarsivi.com web adresinden ulaşılabilir. ©Copyright 20...

The use of chronological or/and corrected age administering BSITD-III in preterm children was investigated in a sample of preterm infants and full-term infants. BSITD-III was administered at 12 months corrected age. The performance scores for the three BSITD-III subscales were calculated according to the child’ chronological age and considering the BSITD-III request for correction referring to ...

Abstract. The paper considers recent approaches to testing homogeneity in a finite mixture model, the modified likelihood ratio test (MLRT) of Chen et al. (2001) and the D-tests of Charnigo and Sun (2004). They are adapted to Weibull mixtures with and without a Weibull-to-exponential transformation of the data. Critical quantiles are calculated by simulation. To cope with the dependency of quan...

A novel procedure is described for accelerating the convergence of Markov chain Monte Carlo computations. The algorithm uses an adaptive bootstrap technique to generate candidate steps in the Markov Chain. It is efficient for symmetric, convex probability distributions, similar to multivariate Gaussians, and it can be used for Bayesian estimation or for obtaining maximum likelihood solutions wi...

An important challenge of portfolio allocation arises when the (true) characteristics of returns distribution are replaced by some estimates. This introduces estimation risk, which is crucial for portfolio management just like traditional financial risk. This paper contrasts with existing literature by focusing on a different measure of performance. We borrow from practitioners and evaluate dif...