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Section Editor: Justine Shults

I am an Associate Professor of Biostatistics in the Department of Biostatistics at the University of Pennsylvania and am Co-Director (with Russel Localio) of a pediatric section of Biostatistics at the Children’s Hospital of Philadelphia.

I teach Linear Models for students in our PhD program and am also the principal investigator of a Renal & Urologic Biostatistics Training Grant (2T32DK060455) that is funded by the National Institute of Diabetes and Digestive and Kidney Disease (NIDDK) in the National Institutes of Health.

I am involved as a statistician co-investigator on NIH funded projects that include studies of bone health in children, psychological effects of injury in urban black men, issues surrounding kidney transplant, taste preference of formula- fed infants, and an intervention that employs social media (in particular, a Facebook group) to promote healthier choices for new mothers. My participation in these studies motivates my own work to develop improved statistical methods for the analysis of longitudinal and clustered data.

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  1. This paper considers an improvement of empirical mode decomposition (EMD) in the presence of missing data. EMD has been widely used to decompose nonlinear and nonstationary signals into some components accord...

    Authors: Donghoh Kim and Hee-Seok Oh
    Citation: SpringerPlus 2016 5:2016
  2. This manuscript implements a maximum likelihood based approach that is appropriate for equally spaced longitudinal count data with over-dispersion, so that the variance of the outcome variable is larger than e...

    Authors: Victoria Gamerman, Matthew Guerra and Justine Shults
    Citation: SpringerPlus 2016 5:1935
  3. Citizen science and crowdsourcing have been emerging as methods to collect data for surveillance and/or monitoring activities. They could be gathered under the overarching term citizen surveillance. The discipli...

    Authors: Marijke Welvaert and Peter Caley
    Citation: SpringerPlus 2016 5:1890
  4. The Lomax distribution (Pareto Type-II) is widely applicable in reliability and life testing problems in engineering as well as in survival analysis as an alternative distribution. In this paper, Weighted Loma...

    Authors: N. M. Kilany
    Citation: SpringerPlus 2016 5:1862
  5. This paper focuses on the application of Markov Chain Monte Carlo (MCMC) technique for estimating the parameters of log-logistic (LL) distribution which is dependent on a complete sample. To find Bayesian esti...

    Authors: Ali A. Al-Shomrani, A. I. Shawky, Osama H. Arif and Muhammad Aslam
    Citation: SpringerPlus 2016 5:1774
  6. The validity and reliability of various items on the GP Patient Survey (GPPS) survey have been reported, however stability of patient responses over time has not been tested. The purpose of this study was to d...

    Authors: Antoinette F. Davey, Martin J. Roberts, Luke Mounce, Inocencio Maramba and John L. Campbell
    Citation: SpringerPlus 2016 5:1755
  7. In this study, we have considered a series system composed of stochastically independent M-component where M is a random variable having the zero truncated modified discrete Lindley distribution. This distribu...

    Authors: Mehmet Yilmaz, Monireh Hameldarbandi and Sibel Acik Kemaloglu
    Citation: SpringerPlus 2016 5:1660
  8. This study employed the quadratic classification function analysis to examine the influence of farmer’s socio-demographic and varietal characteristics of maize on adoption of improved maize varieties (IMVs) i...

    Authors: Abukari Alhassan, Hussein Salifu and Atinuke O. Adebanji
    Citation: SpringerPlus 2016 5:1514
  9. Many epidemiological studies have found that tooth loss is associated with susceptibility to oesophageal cancer. However, a definitive answer is yet to be discovered, and the findings are inconclusive. We perf...

    Authors: Yadong Wang, Juxiang Peng, Yan Li, Hong Luo, Guanglei Huang, Siyang Luo, Xinhai Yin and Jukun Song
    Citation: SpringerPlus 2016 5:1020
  10. We develop a new continuous distribution called the beta-Burr type X distribution that extends the Burr type X distribution. The properties provide a comprehensive mathematical treatment of this distribution. ...

    Authors: Faton Merovci, Mundher Abdullah Khaleel, Noor Akma Ibrahim and Mahendran Shitan
    Citation: SpringerPlus 2016 5:697
  11. Over the decades, testing for equivalence of hazard functions has received a wide attention in survival analysis. In this paper, we proposed a Bayesian test to address this testing equivalence problem, Most of...

    Authors: Gwangsu Kim and Seong-Whan Lee
    Citation: SpringerPlus 2016 5:649
  12. The purpose of this paper is to provide further study of the Marshall–Olkin log-logistic model that was first described by Gui (Appl Math Sci 7:3947–3961, 2013). This model is both useful and practical in areas s...

    Authors: Arwa M. Alshangiti, M. Kayid and B. Alarfaj
    Citation: SpringerPlus 2016 5:385
  13. This study investigates the asymptotic performance of the Quadratic Discriminant Function (QDF) under correlated and uncorrelated normal training samples. This paper specifically examines the effect of correl...

    Authors: Atinuke Adebanji, Michael Asamoah-Boaheng and Olivia Osei-Tutu
    Citation: SpringerPlus 2016 5:102
  14. Stochastic dynamics involved in ecological count data require distribution fitting procedures to model and make informed judgments. The study provides empirical research, focused on the provision of an early w...

    Authors: Caleb Boadi, Simon K. Harvey and Agyapomaa Gyeke-dako
    Citation: SpringerPlus 2015 4:794
  15. Modelling of extreme events has always been of interest in fields such as hydrology and meteorology. However, after the recent global financial crises, appropriate models for modelling of such rare events lead...

    Authors: Ezekiel N. N. Nortey, Kwabena Asare and Felix Okoe Mettle
    Citation: SpringerPlus 2015 4:696
  16. The improper use of statistical methods is common in analyzing and interpreting research data in biological and medical sciences. The objective of this study was to develop a decision support tool encompassing...

    Authors: Aslı Suner, Gökhan Karakülah, Özgün Koşaner and Oğuz Dicle
    Citation: SpringerPlus 2015 4:633
  17. Macmillan Cancer Support UK have developed an electronic Holistic Needs Assessment (eHNA) to: (1) help people living with cancer express all their needs, (2) help those helping them better target support. eHNA...

    Authors: Austyn Snowden and Mick Fleming
    Citation: SpringerPlus 2015 4:623
  18. Although, there exists numerous literature on the procedure for forecasting or predicting election results, in Ghana only opinion poll strategies have been used. To fill this gap, the paper develops Markov cha...

    Authors: Ezekiel N. N. Nortey, Theophilus Ansah-Narh, Richard Asah-Asante and Richard Minkah
    Citation: SpringerPlus 2015 4:525
  19. We investigated in postmenopausal women with primary breast cancer prior to surgical intervention whether, serum levels of different steroid hormones and hormonal precursors associated with tumor tissue estrog...

    Authors: Borbála Vincze, Bence Kapuvári, Nóra Udvarhelyi, Zsolt Horváth, Zoltán Mátrai, Ferenc Czeyda-Pommersheim, Krisztina Kőhalmy, Judit Kovács, Mariann Boldizsár, István Láng and Miklós Kásler
    Citation: SpringerPlus 2015 4:387