Date: Tuesday Oct 4 2011
Place: SBA 130, School of Business Administration, 631 SW Harrison St.,  http://www.pdx.edu/campus-map
Speaker: Yung-Pin Chen, Lewis and Clark College

Title:  Do the Chi-square Test and Fisher's Exact Test
           Agree in Determining Extreme for 2x2 Tables?

Abstract:
There are two common methods for statistical inference on
2x2 contingency tables.  One is the widely taught
Pearson chi-square test, which uses the well-known chi-square
statistic.  The chi-square test is appropriate for large
sample inference, and it is equivalent to the Z-test that
uses the difference between the two sample proportions for
the 2x2 case.  Another method is Fisher's exact test,
which evaluates the likelihood of each table with the same
marginal totals.  We will mathematically justify that
these two methods for determining extreme do not completely
agree with each other.  Our analysis obtains one-sided and
two-sided conditions under which a disagreement in determining
extreme between the two tests could occur.  We also address
the question whether or not their discrepancy in determining
extreme would make them draw different conclusions when testing
homogeneity or independence.  Our examination of the two tests
casts light on which test should be trusted when the two tests
draw different conclusions.

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Date: Tuesday Nov 1 2011
Place:  SBA 130, School of Business Administration
Speaker: Ian H Dinwoodie, Portland State University

Title: Margins, Graphs, and Conditional Independence

Abstract:  
We will give an informal overview of how conditional
independence can be represented graphically, how it relates to 
sufficient statistics in exponential families, and why it is useful for
simulation.


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Date: Tuesday Dec 6 2011
Place: SBA 130
Speaker: Jarrod Brockman, Portland State University
Title:  Dealing with Large Datasets and Fostering Collaboration


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Date: Monday April 9 2012
Place: NH 346, 2:00 P.M.
Speaker: Ian Dinwoodie, Portland State University
Title:  Comparing Network Dynamics Over Finite Fields

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Date: Wednesday May 16 2012
Place: NH 373, 3:00 P.M. 
Speaker: Subhash Kochar, Portland State University
Title: Applications of P-P plots in Probability and Statistics