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Biostatistics Seminars

Department of Biostatistics Seminar Series


The Department of Biostatistics presents a regular speaker series each semester, generally on Thursday afternoon each week. Diverse experts lecture on their work in biostatistics.

Upcoming Biostats Seminars

Biostatistics Seminar Series

Inference and Variable Selection with Random Forests - Lucas Mentch

Thursday 3/1 3:30PM - 4:30PM
Public Health Auditorium (G23)

Biostatistics guest speaker, Lucas Mentch, University of Pittsburgh, Statistics, will present, "Inference and Variable Selection with Random Forests."

Abstract: Despite the success of tree-¬based supervised learning algorithms (bagging, boosting, random forests), these methods are often seen as prediction-¬only tools whereby the interpretability and intuition of traditional statistical models are sacrificed for predictive accuracy. We present an overview of recent work that suggests this black-¬box perspective need not be the case.  We consider a general resampling scheme in which predictions are averaged across base-learners built with subsamples and demonstrate that the resulting estimator belongs to an extended class of U-¬statistics. As such, a central limit theorem is developed allowing for confidence intervals to accompany predictions, as well as formal hypothesis tests for variable significance and model additivity. The test statistics proposed can also be extended to produce consistent measures of variable importance.  In particular, we propose to extend the typical randomized node-wise feature availability to tree-wise feature availability, allowing for hold-out variable importance measures that unlike out-of-bag measures, are robust to correlation structures between predictors.  Demonstrations will be provided on ebird citizen science data. 


 

Last Updated On Monday, February 12, 2018 by Temp, GSPH Marketing & Development
Created On Wednesday, January 31, 2018

Previous Biostats Seminars

Thu 9/20/2018
Biostatistics at the FDA - Jessica (Jeongsook) Kim, FDA Biostatistics Seminar Series
Biostatistics at the FDA - Jessica (Jeongsook) Kim, FDA
Thu 9/20/2018 3:30PM - 4:30PM
Public Health Auditorium (G23)

Jessica Kim, Lead Mathematical Statistician, Food and Drug Administration, will present, “Biostatistics at the FDA”.
Thu 9/6/2018
Joint Modeling of Multiple Time-to-Event Outcomes - Shanshan Zhao, NIH/NIEHS Biostatistics Seminar Series
Joint Modeling of Multiple Time-to-Event Outcomes - Shanshan Zhao, NIH/NIEHS
Thu 9/6/2018 3:30PM - 4:30PM
Public Health Auditorium (G23)

This talk will focus on some recent development in this area, including a nonparametric and a semiparametric approach of estimating the joint survival function. These proposed methods have the ability to explore and estimate dependency between event times as well as to understand the relationship between dependency and risk factors. Simulation evaluations as well as an application to the Women’s Health Initiative’s hormone therapy trial will be presented.
Thu 6/14/2018
Biostatistics Seminar: Jenna Carlson, University of Pittsburgh Biostatistics Seminar Series
Biostatistics Seminar: Jenna Carlson, University of Pittsburgh
Thu 6/14/2018 3:00PM - 4:00PM
1149 Public Health, Foster Conference Room

Biostatistics guest speaker, Jenna Carlson, University of Pittsburgh, will present, "Population-Specific Reference Panels and Genetic Association Studies in Sāmoans."
Tue 5/29/2018
Biostatistics Seminar: Zeda Li, City University of New York Biostatistics Seminar Series
Biostatistics Seminar: Zeda Li, City University of New York
Tue 5/29/2018 2:00PM - 3:00PM
1149 Public Health, Foster Conference Room

Zeda Li, Paul H. Chook Department of Information Systems and Statistics, City University of New York, will present, “Adaptive Bayesian Time-Frequency Analysis of Multivariate Time Series”.

Thu 4/19/2018
Dynamic functional clustering with applications to the MAPP Study-Wensheng Guo-UPenn Biostatistics Seminar Series
Dynamic functional clustering with applications to the MAPP Study-Wensheng Guo-UPenn
Thu 4/19/2018 3:30PM - 4:30PM
Public Health Lecture Hall (A115)

Biostatistics guest speaker, Wensheng Guo, University of Pennsylvania, will present, "Dynamic functional clustering with applications to Multidisciplinary Approach to the Study of Chronic Pelvic Pain (MAPP) study."
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Contact

For information on seminars and events in the department, contact:

Bernadette Kapko
bkapko@pitt.edu
412-624-3022

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