Gilbert Ritschard Explained

Gilbert Ritschard
Birth Date:March 24, 1950
Birth Place:Geneva, Switzerland
Nationality:Swiss
Fields:Quantitative research, Statistics, Sequence analysis
Workplaces:University of Geneva
Alma Mater:University of Geneva
Doctoral Advisor:Emilio Fontela
Academic Advisors:Luigi Solari, Edouard Rossier
Known For:Contributions to sequence analysis and in particular the development of the TraMineR sequence-analysis toolkit.
Spouse:Christiane (Comte) Ritschard

Gilbert Ritschard (born March 24, 1950) is a Swiss statistician specialized in quantitative methods for the social sciences and in the analysis of longitudinal data describing life courses. He is Professor Emeritus at the University of Geneva. He earned a Ph.D. in Econometrics and Statistics at the University of Geneva in 1979. His main contributions are in sequence analysis. He initiated and led the SNFS project that developed the TraMineR R toolkit for sequence analysis.[1] He is one of the founders of the Sequence Analysis Association, which he served as first president.

Scholarly career

Gilbert Ritschard graduated in 1973 in quantitative economics, earned a diploma in Econometrics in 1975, and his Ph.D in Econometrics and Statistics in 1979, all at the Department of Econometrics of the University of Geneva. In his doctoral dissertation titled (in French) [Contributions to the analysis of the qualitative structures of economic models], he developed powerful algorithms for solving qualitative systems of linear equations, i.e., systems where only the sign of the coefficients are known.[2] Such qualitative systems (introduced by Paul Samuelson in his Foundations of Economic Analysis)[3] are of special interest in comparative static analysis.[4] [5] During his time as a student, he served as teaching and research assistant at the Department of Econometrics.

After his Ph.D, Gilbert Ritschard worked during a few months at the United Nations Conference on Trade and Development (UNCTAD) where he participated at the development of a large-scale economic model (see thesis back cover.) He then spent one year as professor at the Department of Economics of the Université du Québec à Montréal before returning to Geneva as maître-assistant [assistant professor] in statistics. In 1986 he was nominated as associate professor of quantitative methods for the social sciences and was promoted as full professor in 1994. Gilbert Ritschard taught as visiting professor in Fribourg, Lausanne, Toronto, and Lyon (Ritschard's CV.) He was one of the promoters of the Swiss National Center of Competence in Research LIVES: Overcoming vulnerability, a Life Course Perspective where he led the quantitative group from 2011 to 2018.

Along his career, his research interest first moved from econometrics and mathematical economics to social statistics, data mining and machine learning, and later to demography and life course analysis. A continuous salient characteristic of Gilbert Ritschard's research is interdisciplinarity as shown by his multiple collaborations with, among others, computer scientists, demographers, historians, sociologists, political scientists, and psychologists.

Selected scholarly works:

exploration, clustering, and visualization, discrepancy analysis,[16] measures of dissimilarities,[17] representative sequences, probabilistic suffix trees,[18] sequence indicators,[19] multidomain/multichannel analysis[20]

References

  1. Gabadinho . Alexis . Ritschard . Gilbert . Müller . Nicolas S. . Studer . Matthias . 2011 . Analyzing and Visualizing State Sequences in R with TraMineR . Journal of Statistical Software . en . 40 . 4 . 10.18637/jss.v040.i04 . 1548-7660. free .
  2. Contribution à l'analyse des structures qualitatives des modèles économiques . P. Lang . 1980 . Berne . 326104750X . Gilbert . Ritschard.
  3. Book: Samuelson, Paul Anthony . Foundations of economic analysis . 1983 . Harvard University Press . 978-0-674-31303-3 . Enlarged . Harvard economic studies . Cambridge, Massachusetts London, England.
  4. Lancaster . Kelvin . 1966 . The Solution of Qualitative Comparative Static Problems . The Quarterly Journal of Economics . 80 . 2 . 278–295 . 10.2307/1880693. 1880693 .
  5. Ritschard . Gilbert . 1983 . Computable Qualitative Comparative Static Techniques . Econometrica . 51 . 4 . 1145–1168 . 10.2307/1912056. 1912056 .
  6. Ritschard . G. . 1992-08-01 . The Fundamentals of Monotone Processes Reviewed Through an Inefficiency Measure . The Quarterly Journal of Economics . en . 107 . 3 . 1125–1136 . 10.2307/2118379 . 2118379 . 0033-5533.
  7. Ritschard . Gilbert . Antille . Gérard . 1992 . A Robust Look at the Use of Regression Diagnostics . Journal of the Royal Statistical Society. Series D (The Statistician) . 41 . 1 . 41–53 . 10.2307/2348635 . 2348635 . 0039-0526.
  8. Kellerhals . Jean . Montandon . Cléopâtre . Ritschard . Gilbert . Sardi . Massimo . Montandon . Cleopatre . 1992 . Le style éducatif des parents et l'estime de soi des adolescents . Revue Française de Sociologie . 33 . 3 . 313 . 10.2307/3322266. 3322266 .
  9. Kellerhals . Jean . Montandon . Cléopâtre . Ritschard . Gilbert . 1992 . Social status, types of family interaction and educational styles . European Journal of Sociology . en . 33 . 2 . 308–325 . 10.1017/S0003975600006482 . 0003-9756.
  10. Olszak . Michael . Ritschard . Gilbert . 1995 . The Behaviour of Nominal and Ordinal Partial Association Measures . The Statistician . 44 . 2 . 195 . 10.2307/2348444. 2348444 .
  11. Ritschard . Gilbert . Gabadinho . Alexis . Muller . Nicolas S. . Studer . Matthias . 2008 . Mining event histories: a social science perspective . International Journal of Data Mining, Modelling and Management . en . 1 . 1 . 68 . 10.1504/IJDMMM.2008.022538 . 1759-1163.
  12. Book: Contemporary issues in exploratory data mining in the behavioral sciences . 2014 . Routledge . 978-0-203-40302-0 . McArdle . John J. . 1. publ . Quantitative methodology series . New York, NY . Ritschard . Gilbert.
  13. Bürgin . Reto . Ritschard . Gilbert . 2015 . Tree-based varying coefficient regression for longitudinal ordinal responses . Computational Statistics & Data Analysis . en . 86 . 65–80 . 10.1016/j.csda.2015.01.003.
  14. Ritschard . Gilbert . Oris . Michel . 2005 . Life Course Data In Demography And Social Sciences: Statistical And Data-Mining Approaches . Advances in Life Course Research . en . 10 . 283–314 . 10.1016/S1040-2608(05)10011-2.
  15. Widmer . Eric D. . Ritschard . Gilbert . 2009-03-01 . The de-standardization of the life course: Are men and women equal? . Advances in Life Course Research . Linked Lives and Self-Regulation. Lifespan - Life Course: Is it really the same? . 14 . 1 . 28–39 . 10.1016/j.alcr.2009.04.001 . 1569-4909.
  16. Studer . Matthias . Ritschard . Gilbert . Gabadinho . Alexis . Müller . Nicolas S. . 2011 . Discrepancy Analysis of State Sequences . Sociological Methods & Research . en . 40 . 3 . 471–510 . 10.1177/0049124111415372 . 0049-1241.
  17. Studer . Matthias . Ritschard . Gilbert . 2016-02-01 . What Matters in Differences Between Life Trajectories: A Comparative Review of Sequence Dissimilarity Measures . Journal of the Royal Statistical Society Series A: Statistics in Society . en . 179 . 2 . 481–511 . 10.1111/rssa.12125 . 0964-1998. free .
  18. Gabadinho . Alexis . Ritschard . Gilbert . 2016 . Analyzing State Sequences with Probabilistic Suffix Trees: The PST R Package . Journal of Statistical Software . en . 72 . 3 . 10.18637/jss.v072.i03 . 1548-7660. free .
  19. Ritschard . Gilbert . 2023 . Measuring the Nature of Individual Sequences . Sociological Methods & Research . en . 52 . 4 . 2016–2049 . 10.1177/00491241211036156 . 0049-1241. free .
  20. Ritschard . Gilbert . Liao . Tim F. . Struffolino . Emanuela . 2023 . Strategies for Multidomain Sequence Analysis in Social Research . Sociological Methodology . en . 53 . 2 . 288–322 . 10.1177/00811750231163833 . 0081-1750. free . 2434/967184 . free .

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