Statistics at UC Berkeley

Speaker: Frank Partnoy, UC Berkeley (Speaker - Featured)
Nov 19, 2019 11:00am 1011 Evans Hall
ABSTRACT: We describe two problems – omitted variable bias and measurement error – that arise when a ratio is the dependent variable in a linear regression. First, we show how bias can arise from the omission of two variables based on a ratio’s denominator, and we describe tests for the degree of bias. As an example, we show that the familiar “inverse U” relationship between managerial ownership...
Jan Vecer, Charles University in Prague
Nov 20, 2019 3:10pm 1011 Evans Hall
This talk connects several basic concepts from probability, statistics and economic theory. We study model prediction in the form of a distributional opinion about a random variable X and show how to test this prediction against alternative views. Different model opinions can be traded on a hypothetical market that trades their differences. Using a utility maximization technique, we describe such...
Giles Hooker, Cornell University
Nov 20, 2019 4:00pm 1011 Evans Hall
This talk develops methods of statistical inference based around ensembles of decision trees: bagging, random forests, and boosting. Recent results have shown that when the bootstrap procedure in bagging methods is replaced by sub-sampling, predictions from these methods can be analyzed using the theory of U-statistics which have a limiting normal distribution. Moreover, the limiting variance...
Neyman Seminar
Speaker: Laurent El Ghaoui, UC Berkeley (Speaker - Featured)
Dec 3, 2019 11:00am 1011 Evans Hall
ABSTRACT: We define a new class of "implicit" deep learning prediction rules that generalize the recursive rules of feedforward neural networks. These models are based on the solution of a fixed-point equation involving a single vector of hidden features, which is thus only implicitly defined. The new framework greatly simplifies the notation of deep learning, and opens up many new possibilities,...
Alex Hening, Tufts University
Dec 4, 2019 3:10pm 1011 Evans Hall
A key question in population biology is understanding the conditions under which the species of an ecosystem persist or go extinct. Theoretical and empirical studies have shown that persistence can be facilitated or negated by both biotic interactions and environmental fluctuations. We study the dynamics of n interacting species that live in a stochastic environment. Our models are described by n...

Statistics at UC Berkeley: We are a community engaged in research and education in probability and statistics. In addition to developing fundamental theory and methodology, we are actively involved in statistical problems that arise in such diverse fields as molecular biology, geophysics, astronomy, AIDS research, neurophysiology, sociology, political science, education, demography, and the U.S. Census. We have forged strong interdisciplinary links with other departments and areas of study, particularly biostatistics, mathematics, computer science, and biology, and actively seek to recruit graduate students and faculty who can help to build and maintain such links. We also offer a statistical consulting service each semester.