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Gilbert Ritschard

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Gilbert Ritschard
Gilbert Ritschard
Born (1950-03-24) March 24, 1950 (age 74)
Geneva, Switzerland
NationalitySwiss
Alma materUniversity of Geneva
Known forContributions to sequence analysis and in particular the development of the TraMineR sequence-analysis toolkit.
SpouseChristiane (Comte) Ritschard
Scientific career
FieldsQuantitative research, Statistics, Sequence analysis
InstitutionsUniversity of Geneva
Doctoral advisorEmilio Fontela
Other academic advisorsLuigi Solari, Edouard Rossier

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

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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) Contribution à l'analyse des structures qualitatives des modèles économiques [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[2] 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:

References

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  1. ^ a b Gabadinho, Alexis; Ritschard, Gilbert; Müller, Nicolas S.; Studer, Matthias (2011). "Analyzing and Visualizing State Sequences in R with TraMineR". Journal of Statistical Software. 40 (4). doi:10.18637/jss.v040.i04. ISSN 1548-7660.
  2. ^ a b Ritschard, Gilbert (1980). Contribution à l'analyse des structures qualitatives des modèles économiques (Thesis). Berne: P. Lang. ISBN 326104750X.
  3. ^ Samuelson, Paul Anthony (1983). Foundations of economic analysis. Harvard economic studies (Enlarged ed.). Cambridge, Massachusetts London, England: Harvard University Press. ISBN 978-0-674-31303-3.
  4. ^ Lancaster, Kelvin (1966). "The Solution of Qualitative Comparative Static Problems". The Quarterly Journal of Economics. 80 (2): 278–295. doi:10.2307/1880693. JSTOR 1880693.
  5. ^ Ritschard, Gilbert (1983). "Computable Qualitative Comparative Static Techniques". Econometrica. 51 (4): 1145–1168. doi:10.2307/1912056. JSTOR 1912056.
  6. ^ Ritschard, G. (August 1, 1992). "The Fundamentals of Monotone Processes Reviewed Through an Inefficiency Measure". The Quarterly Journal of Economics. 107 (3): 1125–1136. doi:10.2307/2118379. ISSN 0033-5533. JSTOR 2118379.
  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. doi:10.2307/2348635. ISSN 0039-0526. JSTOR 2348635.
  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. doi:10.2307/3322266. JSTOR 3322266.
  9. ^ Kellerhals, Jean; Montandon, Cléopâtre; Ritschard, Gilbert (1992). "Social status, types of family interaction and educational styles". European Journal of Sociology. 33 (2): 308–325. doi:10.1017/S0003975600006482. ISSN 0003-9756.
  10. ^ Olszak, Michael; Ritschard, Gilbert (1995). "The Behaviour of Nominal and Ordinal Partial Association Measures". The Statistician. 44 (2): 195. doi:10.2307/2348444. JSTOR 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. 1 (1): 68. doi:10.1504/IJDMMM.2008.022538. ISSN 1759-1163.
  12. ^ Zighed, Djamel A.; Ritschard, Gilbert; Marcellin, Simon (2010), Ras, Zbigniew W.; Tsay, Li-Shiang (eds.), "Asymmetric and Sample Size Sensitive Entropy Measures for Supervised Learning", Advances in Intelligent Information Systems, Studies in Computational Intelligence, Berlin, Heidelberg: Springer, pp. 27–42, doi:10.1007/978-3-642-05183-8_2, ISBN 978-3-642-05183-8, retrieved December 10, 2023
  13. ^ McArdle, John J.; Ritschard, Gilbert, eds. (2014). Contemporary issues in exploratory data mining in the behavioral sciences. Quantitative methodology series (1. publ ed.). New York, NY: Routledge. ISBN 978-0-203-40302-0.
  14. ^ Ritschard, Gilbert (2006), Rizzi, Alfredo; Vichi, Maurizio (eds.), "Computing and using the deviance with classification trees", Compstat 2006 - Proceedings in Computational Statistics, Heidelberg: Physica-Verlag HD, pp. 55–66, doi:10.1007/978-3-7908-1709-6_5, ISBN 978-3-7908-1708-9, retrieved December 10, 2023
  15. ^ Bürgin, Reto; Ritschard, Gilbert (2015). "Tree-based varying coefficient regression for longitudinal ordinal responses". Computational Statistics & Data Analysis. 86: 65–80. doi:10.1016/j.csda.2015.01.003.
  16. ^ Ritschard, Gilbert; Oris, Michel (2005). "Life Course Data In Demography And Social Sciences: Statistical And Data-Mining Approaches". Advances in Life Course Research. 10: 283–314. doi:10.1016/S1040-2608(05)10011-2.
  17. ^ Widmer, Eric D.; Ritschard, Gilbert (March 1, 2009). "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. doi:10.1016/j.alcr.2009.04.001. ISSN 1569-4909.
  18. ^ Studer, Matthias; Ritschard, Gilbert; Gabadinho, Alexis; Müller, Nicolas S. (2011). "Discrepancy Analysis of State Sequences". Sociological Methods & Research. 40 (3): 471–510. doi:10.1177/0049124111415372. ISSN 0049-1241.
  19. ^ Studer, Matthias; Ritschard, Gilbert (February 1, 2016). "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. 179 (2): 481–511. doi:10.1111/rssa.12125. ISSN 0964-1998.
  20. ^ Gabadinho, Alexis; Ritschard, Gilbert; Studer, Matthias; Müller, Nicolas S. (2011), Fred, Ana; Dietz, Jan L. G.; Liu, Kecheng; Filipe, Joaquim (eds.), "Extracting and Rendering Representative Sequences", Knowledge Discovery, Knowlege [sic] Engineering and Knowledge Management, vol. 128, Berlin, Heidelberg: Springer Berlin Heidelberg, pp. 94–106, doi:10.1007/978-3-642-19032-2_7, ISBN 978-3-642-19031-5, retrieved February 17, 2024
  21. ^ Gabadinho, Alexis; Ritschard, Gilbert (2016). "Analyzing State Sequences with Probabilistic Suffix Trees: The PST R Package". Journal of Statistical Software. 72 (3). doi:10.18637/jss.v072.i03. ISSN 1548-7660.
  22. ^ Ritschard, Gilbert (2023). "Measuring the Nature of Individual Sequences". Sociological Methods & Research. 52 (4): 2016–2049. doi:10.1177/00491241211036156. ISSN 0049-1241.
  23. ^ Ritschard, Gilbert; Liao, Tim F.; Struffolino, Emanuela (2023). "Strategies for Multidomain Sequence Analysis in Social Research". Sociological Methodology. 53 (2): 288–322. doi:10.1177/00811750231163833. hdl:2434/967184. ISSN 0081-1750.
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