Pat A. Pellegrini
Department of Geography, The Ohio State University, Columbus

Position Statement
Curriculum Vitae
Address

Position Statement

From the perspective of a scientist involved in spatial analysis, it is clear that GIS has been reasonably successful at making spatial analysis more widely available to physical and social scientists.  More specific to my own research in spatial analysis, the field of spatial point pattern analysis has witnessed substantial advances over the last twenty years (Bailey and Gatrell 1995; Cressie 1991; Diggle 1983).  To be sure, the recent interest in spatial point pattern analysis has been fueled in part by the interest spawned more generally in spatial statistical methods as a result of the development and use of GIS for the storage, manipulation, visualization and analysis of spatially referenced data.
 
However, as noted by several practitioners (Goodchild 1987; Openshaw 1991), commercial GIS products typically provide little in the way of statistical functionality and so the computational implementation of spatial point pattern analysis methods has relied on custom packages such as INFOMAP (Bailey and Gatrell 1995) or on "libraries" of spatial statistical routines which are accessed through statistical packages (eg., SPLANCS and S-plus) or through GIS packages (eg., Spatial Analysis Toolkit and ARC/INFO).  Clearly, the environment currently provided by GIS is deficient and must be augmented with user-written code.
 
To improve existing GIS functionality with regards to spatial point pattern analysis, and more generally, spatial analysis, we need to consider the methodological insights that may gained by embedding the appropriate functionality into a GIS environment.  In this respect, one can consider the emerging field of spatial duration analysis.  Typically, duration analysis is concerned with temporal longitudinal data, but recently has been adapted to the spatial domain since it is feasible to use any non-negative continuous variable in place of time (Pellegrini and Reader 1996; Pellegrini and Grant 1999; Rogerson, Weng and Lin 1993; Esparza and Krmenec 1996).  In my research, I have applied the techniques from duration analysis to inter-event (or point) distance measurements (called spatial durations) from spatial point patterns to investigate spatial dependence, edge effects, and unobserved heterogeneity in the context of innovation diffusion and Congressional voting behavior.
 
However, applying such powerful statistical methods as spatial duration models is hampered by the need for the analyst to blend of tools from existing GIS software with tools in currently available statistical and econometric packages (eg., SPSS, SAS, LIMDEP).  It is here that one must envision the future of spatial point pattern analysis, and explicitly taking advantage of the spatial environment provided by GIS, whereby analysts are able to perform such spatial duration analyses without continually having to cross between various computer software packages and platforms.  Not only should the process be "tightly-coupled," but the functionality of existing GIS must be developed to provide the spatial analyst with the necessary, but generally atypical, data measurements involved in applying and developing the methods of spatial duration analysis.  Below, a simple example from duration analysis illustrates my position.

It is fairly easy to imagine incorporating standard temporal duration models to GIS as being a relatively straightforward task, but it is entirely much more difficult to imagine providing a GIS with the functionality to make the required spatial data measurements to implement spatial duration modelling.  That is, since duration analysis was developed for temporal durations, various aspects of spatial durations such as direction or weights (magnitudes) are not typically a concern of standard statistical packages.   Since temporal durations, by definition, have an implied ordering and directionality, existing statistical software is restricted in its functionality for spatial analysts.  Routine statistical tests like the Log-Rank test for comparing survivor functions require weighted durations for their use in spatial duration modeling, but existing statistical software does not permit such functions.  Thus, this information must be measured and incorporated into spatial duration analyses by user-written routines coupling existing GIS functionality with statistical software packages.  Obviously, spatial duration research extends beyond purely technical concerns such as weighting observations, to the investigation of edge effects and determining the influence of a suite of spatially-varying variables on a spatial process, all of which become increasing complex to handle without suitable spatial analytical functionality in a GIS.  The link between spatial point pattern analysis and spatial duration analysis should not be overlooked since this provides a new framework within which to conceive of spatial processes and to investigate such issues as spatial censoring, spatially-varying variables and spatial heterogeneity.  Spatial analysts must look towards enabling future GIS to handle the special requirements of emerging fields such as spatial duration analysis, particularly since these methods are very suitable for an assortment of research in geography, regional science, and other disciplines that study the Earth's surface.  GIS will make sophisticated spatial analysis tools accessible to more users, but at the same time spatial analytical advances must be facilitated by the development of GIS technology.


Curriculum Vitae

Academic Qualifications

Ph.D. University at Buffalo Geography 1996
M.Sc. McMaster University Geography 1993
B.A. (Hons) McMaster University Geography 1990 (Summa Cum Laude)

Academic Employment History

09/96-present   Dept of Geography Assistant Professor, The Ohio State University
09/95 - 04/96   Dept of Geography Instructor, McMaster University
08/95 - 12/95   National Center for Geographic Research/Graduate Assistant, Information and Analysis (NCGIA)
06/95 - 08/95   Dept of Geography, Instructor, University at Buffalo
08/94 - 06/95   NCGIA Research/Graduate Assistant
08/92 - 08/94   Dept of Geography Natural Science and University at Buffalo Engineering Research Council (NSERC) Scholar
09/91 - 04/92   Dept of Geography NSERC scholar/McMaster University Teaching Assistant
09/90 - 04/91   Dept of Geography Teaching Assistant McMaster University

Major Research Interests

Interregional migration (spatial choice) modelling with geographically disaggregate microdata, including movement of the foreign-born, return, onward and primary migration and elderly migration;  Statistical analysis of spatial point patterns using duration models including applications to political science;  Retail and marketing geography with emphasis on consumer behavior and store choice;  Exploratory spatial data analysis and GIS;

Major Teaching Interests

Population Geography; Quantitative/Statistical Methods in Geography; Locational Analysis; Urban Geography; Geographical Information Systems; Retail and Marketing Geography; World Regional

Honors and Research Funding

The Ohio State University

1.  Social and Behavioral Sciences, International Travel 1998 $2000.US
2.   Who’s Who... Students in American Universities... 1997 -

University at Buffalo/NCGIA

3.  NCGIA Research Assistantship  1995 4,723.
4.  NCGIA Graduate Assistantship  1994-95 7,400.
5.  NCGIA Research Assistantship  1994-95 2,046
6.  NCGIA Travel Grant  1994-95 500
7.  NCGIA Tuition Scholarship  1994-95 7,313
8.  Graduate Students Association Conference Grant 1993-94 150
9.  Canadian American Studies Grant  1993-94 450
10.  NCGIA Conference Grant  1993-94 250
11. Department of Geography Grant  1993-94 250
12. Geography Graduate Students Association 1993-94 50
13. NSERC Postgraduate Scholarship  1993-94 17,400.CN
14. Canadian American Studies Grant  1992-93 450.US
15. Graduate Student's Association Grant  1992-93 1000
16. NCGIA Conference Grant  1992-93 250
17. Department of Geography, McMaster University 1992-93 250
18. Department of Geography  1992-93 250
19. NSERC Postgraduate Scholarship  1992-93 17,400.CN
20. Faculty of Social Sciences Tuition Scholarship 1992-93 7316.
21. Dept. of Geography, Graduate Assistantship (declined) 1992-93 7096.

McMaster University

22.  NSERC Postgraduate Scholarship  1991-92  $15,000.CN
23.  Ontario Graduate Scholarship (declined)  1991-92 11,300
24.  University Teaching Assistantship   1991-92  7,615
25.  University Teaching Assistantship  1990-91  7,615
26.  Departmental Scholarship  1990-91  4,500
27.  Lloyd Reeds Prize   1990-91 50
28.  University Prize for Special Achievement 1989-90 150
29.  Deans' Honour List  1989-90
30.  S.Ontario Economic Development Council Scholarship 1988-89 900
31. Deans' Honour List  1988-89

Research Grants

1. P.A. Pellegrini  "Primary, Return and Onward Migration Destination Choice"  The Ohio State University Seed Grant Program, 1996-97, $12,550.

Grant Proposals (pending)

1. P.A. Pellegrini and K. Gibson.  “Using Intra-urban mobility patterns to evaluate the vitality of central city: A case study of Columbus, OH” to be submitted to The Committee on Urban Affairs Faculty Research Grant Competition, 1998-99.

Major Publications (and submissions)

1. P.A. Pellegrini and Steven Reader
“Duration Modeling of Spatial Point Patterns.” Geographical Analysis 28(3):219-243, 1996.

2. A.S. Fotheringham and P.A. Pellegrini
“Disaggregate Migration Modelling: A comparison of Microdata sources from the U.S., U.K., and Canada."  Area 28(3):347-357, 1996.

3. P.A. Pellegrini, A.S. Fotheringham and G. Lin
"An Empirical Evaluation of Parameter Sensitivity to Choice Set Definition in Shopping Destination Choice Models." Papers in Regional Science 76(2):257-284, 1997.

4. P.A. Pellegrini and A.S. Fotheringham.
“Intermetropolitan Migration and Hierarchical Destination Choice: A Competing Destinations Analysis.” Environment and Planning A. in press, 1999.

5. P.A. Pellegrini and J. Tobin Grant
“Policy Coalitions and Patterns of Cosponsorship in the U.S. Legislature: A Spatial Duration Modeling Approach.” Geographical Analysis. in press, January 1999.

6. P.A. Pellegrini
“Intermetropolitan Migration: Spatial Variation and Spatial Structure” submitted to Geographical and Environmental Modelling.

7. P.A. Pellegrini and A.S. Fotheringham.
"Modelling the Destination Choices of Migrants.” submitted to Progress in Human Geography.

8. P.A. Pellegrini and Jason Feldman.
“Primary, Return and Onward Intermetropolitan Migration Destination Choice: A Competing Destinations Approach.” submitted to International Journal of Population Geography.

9. P.A. Pellegrini and Jennifer A. Paine
“Unraveling the Migration Behavior and Destination Choices of Foreign-Born ‘Asians:’ A Disaggregate Analysis based on the U.S. PUMS.” submitted to International Migration Review.

Minor Publications

1. P.A. Pellegrini
"Choice Set Definition in Shopping Destination Choice Models: Some Sensitivity Analysis Results", Journal of the Middle States Geographer, Vol. 28, 138-148, 1995.

2. M. Batty, P.A. Pellegrini, C.J. Cote, and Xiaohua Zheng
"Data Sources for New Urban Land Use-Transportation Models."  in Proceedings of the Conference on New Urban Land Use and Transportation Models, Dallas, TX, 1995.

3. P.A. Rogerson, A.S. Fotheringham with P.A. Pellegrini
"Research Initiative 14: GIS and Spatial Analysis: Closing Report." NCGIA Publications, University of California at Santa Barbara, CA, 1995.

4. P.A. Pellegrini and R. Carroll (Eds.)
Proceedings of the First Annual McMaster/University at Buffalo Graduate Conference in Geography.  74 pages, 1993.

Manuscripts in Preparation

1. P.A. Pellegrini
“Spatial structure, Hierarchy and Intermetropolitan Migration Destination Choice”
anticipate submission to Growth and Change by fall’98

2. P.A. Pellegrini
"Intermetropolitan Migration in the U.S., 1985-1990: The Role of Migrant Selectivity."
anticipate submission to Environment and Planning A by winter ‘99

3. P.A. Pellegrini and S. Reader
"Censoring and Edge Effects in Duration Models of Spatial Point Patterns: A Simulation Experiment."
anticipate submission to Geographical Analysis by winter ‘99

4. J. Tobin Grant and P.A. Pellegrini
“A Spatial Analysis of Cosponsorship Coalitions in the U.S. House of Representatives”
anticipate submission to Political Analysis by fall ‘98

5. Jason Feldman and P.A. Pellegrini
“Family Migration Behavior and Migration History”
anticipate submission to The Professional Geographer by winter ‘98

6. P.A.  Pellegrini and Salvatore LiCausi
“Elderly Migration Patterns and the Development of Channelized Migration Streams from New York to Florida, 1970 -1990"
anticipate submission to Research on Aging by fall ‘98

Paper Presentations at Professional Meetings

1. “Spatial Duration Modelling of Policy Coalitions and Patterns of Cosponsorship in the U.S. Legislature”, paper presented at the Commission on Modelling Geographical Systems meeting of the International Geographical Union, Lisbon, Portugal, 1998.

2. “Spatial Structure, Hierarchy, and Intermetropolitan Migration Destination Choice” paper presented at the Association of American Geographers Annual Meeting, Boston, MA, 1998

3. “The Effects of Primary, Return and Onward Migration on Employment” (with Jason Feldman) paper presented at the Association of American Geographers Annual Meeting, Boston, MA, 1998.

4. “Unraveling the Migration Behavior and Destination Choices of Foreign-Born “Asians:” A Disaggregate Analysis based on the U.S. PUMS”(with Jennifer A. Paine) paper presented at the Association of American Geographers Annual Meeting, Boston, MA, 1998

5. “Patterns of Residential Mobility in Franklin County, OH” (with Kristen Gibson) paper presented at the Association of American Geographers Annual Meeting, Boston, MA, 1998.

6. “Spatial Structure and Intermetropolitan Migration Destination Choice” paper presented at the North American Meetings of the Regional Science Association International, Buffalo, NY, 1997.

7. “Intermetropolitan Destination Choice of Return, Onward and Primary Migrants” (with Jason Feldman) paper presented at the North American Meetings of the Regional Science Association International, Buffalo, NY, 1997

8. “Unraveling the Migration Behavior and Destination Choices of Foreign-Born “Asians:” A Disaggregate Analysis based on the U.S. PUMS” (with Jennifer A. Paine) paper presented at the North American Meetings of the Regional Science Association International, Buffalo, NY, 1997.

9. “Intermetropolitan Migration Destination Choice and Hierarchical Information Processing: An analysis based on the PUMS”, paper presented at the Association of American Geographers Annual Meeting and winner of Mathematical Models and Quantitative Methods specialty group student paper competition, Forth Worth, TX, April 1997.

10. "Hierarchical Information Processing in Destination Choice Models: Further Evidence from the PUMS Data", paper presented at the Association of American Geographers Annual Meeting, Charlotte, NC, April 1996.

11. "Hierarchical Information Processing in Destination Choice Models: Evidence from the PUMS Data", paper presented at the Canadian Regional Science Association Annual Meeting, Université du Québec à Montréal, Montréal, Canada, June 1995.

12. "Spatial Choice Models of U.S. Migration, 1985-1990", paper presented at the Association of American Geographers Annual Meeting, Chicago, March 1995.  Special session on Advances in Discrete Choice Modelling.

13. "Spatial Choice Models of U.S. Migration, 1985-1990: An application of the Public Use Microdata Samples from the U.S. Bureau of the Census, 1990", paper presented at the Institute of British Geographers Annual Conference, University of Northumbria at Newcastle, UK, January 1995.  Special session on The Use of Secondary Data For Geographical Research and Teaching.

14. "Parameter Sensitivity to Choice Set Definition in Shopping Destination Choice Modelling", paper presented at the Middle States Division, Association of American Geographers Annual Meeting, Vassar College, Poughkeepsie, New York, October 1994.

15. "Spatial Choice Models of U.S. Migration, 1985-1990", (invited) paper presented at the Graduate Group in Demography Research Seminar, University at Buffalo, May 1994.

16. "Spatial Choice Set Formation and Cognition", paper presented at the Association of American Geographers Annual Meeting, San Francisco, April 1994.  Special session on Spatial Choice: Modelling, Spatial Cognition and Information Hierarchies.

17. "Defining Spatial Choice Sets: A Sensitivity Analysis", paper presented at the McMaster/University at Buffalo Graduate Conference, McMaster University, Hamilton, March 1994.

18. "The Application of Event History Models to the Analysis of Spatial Point Patterns and Processes:  Issues Regarding Interval Definition, Censoring and Explanatory Variables", presented at the Canadian Association of Geographers Meeting, Ottawa, May 1993.

19. "Event History Modelling of Spatial Point Patterns", paper presented at the Association of American Geographers Annual Meeting, San Diego, April 1992.  Session on Methods of Spatial Analysis.

Scholarly and Professional Activities

The Ohio State University

Personnel Committee member      1997-00
RSAI Newsletter Co-editor       1998-00

University at Buffalo

Senator  Geography Graduate Students Association  1994-95
President  Geography Graduate Students Association  1993-94
Co-Organizer  McMaster/UB Graduate Conferences  1993-94
Contributing writer The Graduate Quill Graduate Newspaper  1992-93
Senator  Geography Graduate Students Association  1992-93
Active Member Geography Graduate Students Association  1992-96

McMaster University

Graduate Rep. Faculty of Social Sciences    1991-92
President  McMaster University Geography Society  1989-90
Undergraduate Rep. Faculty of Social Sciences    1989-90
Undergraduate Rep. Geography Alumni Committee   1989-90
Undergraduate Rep. Dept. of Geography Faculty Meetings  1989-90
Active member McMaster University Geography Society  1987-92

Professional Organizations

Commission on Modelling Geographical Systems (IGU)  1998-99
Association of American Geographers    member since 1991
Canadian Association of Geographers    member since 1990
Canadian Regional Science Association    member since 1993
Population Association of America     member since 1996
 


Address

Pasquale (Pat) A. Pellegrini
Department of Geography
The Ohio State University
1036 Derby Hall, 154 N. Oval Mall
Columbus, OH 43210-1361
Telephone: (614) 292-9686
Fax: (614) 292-6213
Email: ppellegr@scooby.sbs.ohio-state.edu


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