Skip to main content


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.

Page 2 of 2

  1. This research article aimed at modeling the variations in the dollar/cedi exchange rate. It examines the applicability of a range of ARCH/GARCH specifications for modeling volatility of the series. The variant...

    Authors: Michael Techie Quaicoe, Frank B K Twenefour, Emmanuel M Baah and Ezekiel N N Nortey
    Citation: SpringerPlus 2015 4:329
  2. In this article, a method has been developed to construct the membership surface of imprecise vector based on Randomness-Impreciseness Consistency Principle. The Randomness-Impreciseness Consistency Principle ...

    Authors: Dhruba Das and Hemanta K Baruah
    Citation: SpringerPlus 2014 3:722
  3. In this article we explore the semantic space spanned by self-reported statements of Republican voters. Our semantic structure analysis uses multidimensional scaling and social network analysis to extract, exp...

    Authors: Patrick Mair, Thomas Rusch and Kurt Hornik
    Citation: SpringerPlus 2014 3:697
  4. Statistical tables are an important component of data analysis and reports in biological sciences. However, the traditional manual processes for computation and presentation of statistically significant result...

    Authors: Houssein I Assaad, Lan Zhou, Raymond J Carroll and Guoyao Wu
    Citation: SpringerPlus 2014 3:474
  5. In this paper we are proposing a general framework for the analysis of the complete set of log Odds Ratios (ORs) generated by a two-way contingency table. Starting from the RC (M) association model and hypothe...

    Authors: Ida Camminatiello, Antonello D’Ambra and Pasquale Sarnacchiaro
    Citation: SpringerPlus 2014 3:384
  6. In trials with binary outcomes, assessed repeatedly at pre-specified times and where the subject is considered to have experienced a failure at the first occurrence of the outcome, interim analyses are perform...

    Authors: Sameer Parpia, Jim A Julian, Chushu Gu, Lehana Thabane and Mark N Levine
    Citation: SpringerPlus 2014 3:323
  7. Data analysis based on breast cancer risk factors such as age, race, breastfeeding, hormone replacement therapy, family history, and obesity was conducted on breast cancer patients using a new enhanced compute...

    Authors: Kok Swee Sim, Sze Siang Chong, Chih Ping Tso, Mohsen Esmaeili Nia, Aun Kee Chong and Siti Fathimah Abbas
    Citation: SpringerPlus 2014 3:268
  8. Log-Burr distribution is a generalization of logistic and extreme value distributions, which are important reliability models. In this paper, Bayesian approach is used to model reliability data for log-Burr mo...

    Authors: Md Tanwir Akhtar and Athar Ali Khan
    Citation: SpringerPlus 2014 3:185
  9. The distributions of medical costs are often skewed to the right because small numbers of patients use large amounts of health care resources. Using data from a study of colon cancer costs, we show, by example...

    Authors: Thomas Weichle, Denise M Hynes, Ramon Durazo-Arvizu, Elizabeth Tarlov and Qiuying Zhang
    Citation: SpringerPlus 2013 2:614
  10. This article presents the ability of an omnibus permutation test on ensembles of two-locus analyses (2LOmb) to detect pure epistasis in the presence of genetic heterogeneity. The performance of 2LOmb is evalua...

    Authors: Damrongrit Setsirichok, Phuwadej Tienboon, Nattapong Jaroonruang, Somkit Kittichaijaroen, Waranyu Wongseree, Theera Piroonratana, Touchpong Usavanarong, Chanin Limwongse, Chatchawit Aporntewan, Marong Phadoongsidhi and Nachol Chaiyaratana
    Citation: SpringerPlus 2013 2:230
  11. Adverse Drug Reaction (ADR) is one of the most important issues in the assessment of drug safety. In fact, many adverse drug reactions are not discovered during limited pre-marketing clinical trials; instead, ...

    Authors: Wen-Yang Lin, He-Yi Li, Jhih-Wei Du, Wen-Yu Feng, Chiao-Feng Lo and Von-Wun Soo
    Citation: SpringerPlus 2012 1:72
  12. Primary open-angle glaucoma (POAG) is one of the major causes of blindness worldwide and considered to be influenced by inherited and environmental factors. Recently, we demonstrated a genome-wide association ...

    Authors: Yuichi Tokuda, Tomohito Yagi, Kengo Yoshii, Yoko Ikeda, Masahiro Fuwa, Morio Ueno, Masakazu Nakano, Natsue Omi, Masami Tanaka, Kazuhiko Mori, Masaaki Kageyama, Ikumitsu Nagasaki, Katsumi Yagi, Shigeru Kinoshita and Kei Tashiro
    Citation: SpringerPlus 2012 1:41