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# Statistics Discussion Group

**DMS Statistics Seminar**

Dec 08, 2017 11:00 AM

Parker Hall 246

**Christopher Burton**, Assistant Professor, Department of Geosciences

**DMS Statistics Seminar**

Dec 01, 2017 03:00 PM

Parker Hall 224

**Li Chen**, Assistant Professor of Pharmacy

**DMS Statistics Seminar**

Nov 17, 2017 11:00 AM

Parker Hall 246

Speaker: **Debswapna Bhattacharya**, Assistant Professor, Department of Computer Science & Software Engineering

Title: Probabilistic Graphical Model for Protein Folding

Abstract: Graphical models have emerged as one of the most powerful ways to capture the dynamics of natural systems in recent years. Protein folding is a grand puzzle of nature that remains to be solved even after more than 50 years of intense research. In this talk, I will first introduce the nature of protein molecule and present a computational abstraction of protein folding problem. Then, I will present my latest research of developing algorithms to simulate protein folding in silico by formulating probabilistic graphical model that integrates probability distributions from directional statistics, a field of statistics concerned with angles and orientations to model wind directions or astronomical observations, to represent and learn systematic patterns observed in naturally occurring proteins. Using the trained model as a proposal distribution and employing Markov chain Monte Carlo sampling, protein folding can be computationally replicated and predicted with high degree of accuracy and speed. The method overcomes the limitations of existing approaches and was ranked as one of the 19 most innovative methods in community-wide blind assessments, demonstrating great potential of graphical models in tackling protein folding problem in particular and other fundamental problems in life sciences in general.

**DMS Statistics Seminar**

Nov 10, 2017 11:00 AM

Parker Hall 246

**Liang Liu**, Associate Professor, Department of Statistics, University of Georgia

Title: An age-dependent birth-death model for gene family evolution

**DMS Statistics Seminar**

Nov 03, 2017 11:00 AM

Parker Hall 246

**Jordan Harshman**, Assistant Professor,Department of Chemistry and Biochemistry, Auburn University

**Marilyne Stains**, Department of Chemistry, University of Nebraska-Lincoln

Title: Characterizing teacher and student behaviors in over 2,000 classes: A journey into mixed-model clustering

*currently*teach their courses to track

*changes*to the norms. To address this, we codified 13 student and 12 instructor behaviors in 2,028 classes taught by 545 STEM faculty from over 25 institutions. A total of seven instructional profiles, which are groups of student and instructor behaviors, were determined using mixture model clustering. Data sets this large and with this many variables are notorious for producing unstable solutions when mix-model clustering techniques are applied, but we propose a novel means of choosing an empirically superior model. The most prominent behaviors were lecturing for instructors and listening for students, resembling a traditional didactic instructional style (~55%). Another ~25% of instructors were classified into interactive lecture categories while the remaining 20% demonstrated predominately student-centered strategies. Additionally, we discovered that an instructor’s practices can vary significantly within a course, indicating that multiple observations are required to gain a complete picture of that faculty’s instruction.

**Statistics Seminar**

May 05, 2017 11:00 AM

Parker Hall 324

Speaker: **Hans Werner van Wyk**

Title: Numerical Statistics; Statistical Numerics

Abstract: Numerical analysis (the study of algorithms and approximation), and statistics (the study of data) have long been considered distinct fields of research. However, they are increasingly being used in conjunction to solve interesting real world problems. For example, efficient numerical optimization- and linear algebra routines facilitate the statistical analysis and processing of large complex datasets. Also, the rise of scientific computing has resulted in the prevalent use of numerical simulations to supplement physical observations. This has led to the need to consider efficiency and accuracy of numerical approximations in the statistical estimation and prediction of these systems. On the other hand, statistics is playing an increasingly important role in the development and analysis of numerical algorithms themselves, such as investigations into the statistical properties of numerical errors, fault detection for computational nodes in a supercomputer, or the use of randomization to speed up and stabilize numerical linear algebra routines. This informal talk explores the fascinating interplay between these two complementary areas of mathematics within the context of a few simple numerical examples.

This is the last Statistics Seminar talk for this semester.

**Statistics Seminar**

Apr 28, 2017 11:00 AM

Parker Hall 324

CANCELED NO SEMINAR

**Statistics Seminar**

Apr 21, 2017 11:00 AM

Parker Hall 324

Speaker: **Yujin Chung**

Title: Joint distribution of tree shape and tree distance for recombination detection

**Statistics Seminar**

Apr 14, 2017 11:00 AM

Parker Hall 324

**Laurie Stevison**

**Approaches and challenges in quantifying recombination rate and hybridization along the genome**

**Statistics Seminar**

Apr 07, 2017 11:00 AM

Parker Hall 324

**Xiaoyu Li**

**Statistical Analysis with Missing Data: Some Examples**

Last Updated: 09/11/2015