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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 12/6/2018
Biostatistics Faculty Presentations: Jeanine M. Buchanich and Yongseok Park Biostatistics Seminar Series
Biostatistics Faculty Presentations: Jeanine M. Buchanich and Yongseok Park
Thu 12/6/2018 3:30PM - 4:30PM
Public Health Auditorium (G23)

Thu 11/29/2018
Dulal K. Bhaumik, University of Illinois at Chicago Biostatistics Seminar Series
Dulal K. Bhaumik, University of Illinois at Chicago
Thu 11/29/2018 3:30PM - 4:30PM
Public Health Auditorium (G23)

Dulal K. Bhaumik, Division of Epidemiology and Biostatistics, University of Illinois at Chicago, will present, “Statistical Methodologies for Neuroconnectivity Analysis Using Autistic fMRI Data”.
Thu 11/8/2018
Hongzhe Lee, University of Pennsylvania Biostatistics Seminar Series
Hongzhe Lee, University of Pennsylvania
Thu 11/8/2018 3:30PM - 4:30PM
Public Health Auditorium (G23)

Hongzhe Lee, Department of Biostatistics and Epidemiology, University of Pennsylvania, will present, “Optimal Permutation Recovery and Estimation of Bacterial Growth Dynamics”.
Thu 11/1/2018
Jingyi (Jessica) Li, University of California, Los Angeles Biostatistics Seminar Series
Jingyi (Jessica) Li, University of California, Los Angeles
Thu 11/1/2018 3:30PM - 4:30PM
Public Health Auditorium (G23)

Jingyi (Jessica) Li, Department of Statistics and Department of Human Genetics, University of California, Los Angeles, will present, “Neyman-Pearson Classification Algorithms and NP Receiver Operating Characteristics”.
Thu 10/25/2018
Dana L. Tudorascu, University of Pittsburgh Biostatistics Seminar Series
Dana L. Tudorascu, University of Pittsburgh
Thu 10/25/2018 3:30PM - 4:30PM
Public Health Auditorium (G23)

Dana Tudorascu, Division of General Internal Medicine, Department of Medicine, University of Pittsburgh, will present, “Technical Challenges in the Statistical Analysis of Neuroimaging Studies of Alzheimer's Disease”.
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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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