Friday, November 18, 2005
| Title |
Hurricane forecasting for the Atlantic basin |
| Speaker |
Dr. Charlie Paxton
Science and Operations Officer
National Weather Service
Ruskin, FL |
| Time |
3:00-4:00 p.m. |
| Place |
PHY 108 |
Abstract
We will cover factors that affect hurricane development, hurricane climatology,
hurricane modeling, and a review of the 2005 hurricane season.
Friday, October 28, 2005
| Title |
Statistical Analysis of Coral Reef Data |
| Speaker |
Armando Hoare |
| Time |
3:00-4:00 p.m. |
| Place |
PHY 108 |
Abstract
Since 1996, the Florida Keys Coral Reef Monitoring Project has been sampling
annually some permanent coral reef sites off the Florida Keys. Three sets of
data are obtained: video transects data, species inventory, and absence or
presence of disease per species. Using nonparametric Friedman repeated-measure
testing, the hypothesis that coral cover remains the same over time was tested
sanctuary wide and across regions and habitats. This hypothesis was rejected
for both 1999-2004 and 2003-2004 time periods sanctuary-wide, for most of the
habitats and Lower Keys region; it was not rejected for Upper Keys and Middle
Keys. The investigation of coral cover on station level, using proportionality
testing, revealed the stations with no change and those with significant loss
or gain over the years 2004 vs. 1999-2003 and 2004 vs. 2003. The analysis of
species inventory data, based on a jackknifing estimate of the Shannon-Weiner
diversity index, showed a significant loss in species richness. The presence
of bleaching, white pox and other diseases has increased over the years from
1996 to 2002, while black band disease has remained practically unchanged.
We will discuss statistical data analyses as an efficient tool for assessing
spatial and temporal changes in coral reef ecosystems.
Friday, October 14, 2005
| Title |
Individual-patient data meta-analysis (IPD MA) in the presence
of competing risks |
| Speaker |
Dr. B. Djulbegovic
H. Lee Moffitt Cancer Center, USF |
| Time |
3:00-4:00 p.m. |
| Place |
PHY 108 |
Abstract
In conventional IPD-MA of time-to-event data, events of the interest which are
yet to be observed are “censored”. Censoring is typically assumed to
be “non-informative”, i.e., the probability of observing the
subsequent event of interest is not affected by any characteristics of the study
patients. However, an alternative view is that if the patient experienced a
different event of interest (e.g., death) he/she cannot be at the risk of
developing an outcome that we may be interested in. Therefore, these competing
risks (CR) should be taken into account in the analysis of survival data. We
performed IPD MA of 9 trials (n = 1,111 patients) that compared
allogeneic peripheral stem cell transplant (PBSCT) with bone marrow transplant
(BMT) in treatment of hematologic malignancies. The event of interest was
extensive stage of chronic graft vs. host disease (cGVHD). The analysis was
performed with and without taking two CR (death, relapse) into account. IPD MA of
time-to-event data may produce dramatic differences in the results depending on
whether CRs were taken into account. The users of such evidence should be aware of
this. We provide, for the first time, a method for performing IPD MA in the
presence of CRs along with user-friendly program in STATA statistical package.
Friday, September 30, 2005
| Title |
Avenues for Collaboration in Volcanology and Statistics |
| Speaker |
Dr. Charles Connor
Geology Department, USF |
| Time |
3:00-4:00 p.m. |
| Place |
PHY 108 |
Abstract
Volcanoes are complex physical systems. Worldwide, volcanoes present hazards to
many communities and hazard mitigation can only be accomplished through
collaboration between scientists with varying expertise. Data on volcanic systems
will be presented with a eye toward developing collaborative research projects
related to the time scales of volcanic eruptions, patterns of volcanic activity,
and geophysical flows that produce hazards at erupting volcanoes.
Friday, September 23, 2005
| Title |
Multiple Regression Estimation of Sexual Orientation Income
Differentials |
| Speaker |
Wendy Pogoda |
| Time |
3:00-4:00 p.m. |
| Place |
PHY 108 |
Abstract
Multiple regression is one of the most common statistical techniques used by
labor economists to analyze and estimate wage differentials between groups of
workers. In the last decade a few economists have expanded these techniques to
analyze differences in wages between individuals of different sexual orientations.
An expansion of this body of work, which accounts for the correlation between
marital status and sexual orientation, possible different income effects between
bisexuals and homosexuals, and differences in the hours worked across sexual
orientations of women, will be presented.
Friday, September 16, 2005
| Title |
On Hastings-Metropolis Algorithm |
| Speaker |
Rebecca Wooten |
| Time |
3:00-4:00 p.m. |
| Place |
PHY 108 |
Friday, September 9, 2005
| Title |
Record Values of Univariate Distributions |
| Speaker |
Dr. Mohammad Ahsanullah (Moe Ahsan)
Visiting Professor |
| Time |
3:00-4:00 p.m. |
| Place |
PHY 108 |
Abstract
Record values of univariate distributions are defined. Some basic distributional
properties of record values are given. Inferences based on record values for
Type I Extreme Values distribution are presented.