Week of February 16 - 20, 1998

Monday, February 16

11:30 MATHEMATICS EDUCATION SEMINAR  - Room 447 MSC
      Barbara Moses, Dept. of Mathematics and Statistics, BGSU. 
      "Constructivist classrooms:  Are they meaningful in mathematics?"

 2:30 ALGEBRA SEMINAR  - Room 447 MSC
      Curt Bennett, Dept. of Mathematics and Statistics, BGSU. 
      "Buildings and BN-pairs"

 3:30 STATISTICS SEMINAR SERIES  - Room 459 MSC
      Jiahua Chen, University of Waterloo, visiting BGSU this semester
      "Empirical Likelihood Methods"

Tuesday, February 17

10:30 GRADUATE STUDENT SEMINAR  - Room MSC 459
      Asoka Ramanayake, Dept. of Mathematics and Statistics, BGSU. 
      "Epidemic Change for the Exponential Distribution"
      Abstract: Consider a sequence of independent random variables
        that are susceptible to changing their distribution at unknown
        instances.  In such a situation, it is of interest to test if
        such changes have occurred or not.  And if such changes have
        occurred, we would like to detect the locations of these
        changes.  This is what is commonly known as the change-point
        problem.  These change-point problems have many applications.
        Quality control procedures, certain medical studies,
        segmentation of speech, would be just a sampling of the many
        possible application areas.

        This work addresses the epidemic model. A sequence of
        independent exponential random variables is hypothesized to
        have equal means, and we would like to test whether the means
        have been subjected to an epidemic change after an unknown
        point, for an unknown duration in the sequence.  The
        likelihood ratio statistic and a likelihood ratio type
        statistic are derived.  The distribution theories and related
        properties of the test statistics are discussed.  Percentage
        points and powers of the tests are tabulated for selected
        values of the parameters.  The powers of these two tests are
        then compared to the two statistics proposed by Aly and
        Bouzar.

      Everybody is welcome to attend.  

 2:30 SCIENTIFIC COMPUTATION SEMINAR  - Room 459 MSC
      Samantha Gedeon, Dept. of Mathematics and Statistics, BGSU. 
      "Analysis of Nonlinear BVP via Phase Plane Techniques"

 2:30 MAPLE WORKSHOP  - Scientific Computing Lab, MSC
      John Gresser, Dept. of Mathematics and Statistics, BGSU. 

Wednesday, February 18

11:30 MATHEMATICS EDUCATION SEMINAR  - Room 447 MSC
      Barbara Moses, Dept. of Mathematics and Statistics, BGSU. 
      "Constructivist classrooms:  Are they meaningful in mathematics?"
      
Thursday, February 19

 1:00 STATISTICAL COMPUTING SEMINAR  - Room 459 MSC
      Jim Albert, Dept. of Mathematics and Statistics, BGSU. 
      "Basics of Simulation"

Friday, February 20
      
 3:30 Coffee
 3:45 COLLOQUIUM  - Room 459 MSC
      Tze Chien Sun, Wayne State University
      "Limit Theorems for Processes with Long Range Dependence"
      Abstract: First I shall define a process with long range
        dependence.  Then I shall discuss the difference between the
        limit theorems for processes with and without long range
        dependence, and give a survey of recent results in this
        area. If time allows I shall talk about some applications.