Vassilis G. S. Vasdekis

Department of Statistics
Athens University of Economics and Business
Patission 76
104 34 Athens
Greece
Tel: +30-210-8203529

Fax: +30-210-8203533 
e-mail: vasdekis@aueb.gr 

 

 

I am Associate Professor in the Department of Statistics of the Athens University of Economics and Business.

 

 University Degrees

·        1983-1988, B.Sc. in Mathematics, Department of Mathematics, University of Athens, Greece.

·        1989-1990, M.Sc. in Applied Statistics, Department of Statistics, University of Oxford, UK.

·        1990-1993 , D.Phil in Statistics, Department of Statistics, University of Oxford, UK (St. Peter’s College).

 


Previous Appointments

 

·        1994-1998, Adjunct Lecturer, Department. of Psychology, University of Crete, Greece

·        1999-2003, Lecturer, Department. of Statistics, Athens University of Economics and Business, Greece

·        2003-2009, Assistant Professor, Department. of Statistics, Athens University of Economics and Business, Greece

·        2009- , Associate Professor, Department. of Statistics, Athens University of Economics and Business, Greece

 

 

Teaching

 

For the winter semester of 2011/2012 I am teaching Applied Linear Models to 3rd year undergraduates and GLM to full-time postgraduates.

The following link is of interest to the students of the part-time postgraduate program in medical statistics.

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Lecture Notes

 

  • Vasdekis, V. (1995). Statistics for Psychologists, Lecture notes, Department of Psychology, University of Crete
  • Vasdekis, V. (1999). Lecture notes on distribution theory and applications on a computer. Lecture notes, Department of Statistics, Athens University of Economics and Business.
  • Vasdekis, V. (2001). Applied Linear Models. Lecture notes (available through e-class), Department of Statistics, Athens University of Economics and Business.
  • Vasdekis, V. and Psarakis, S. (2001). Design of experiments and analysis of variance. Lecture notes (available through e-class), Department of Statistics, Athens University of Economics and Business.
  • Vasdekis, V. and Moustaki, I. (2005). Analysis of categorical data. Lecture notes (available through e-class), Athens University of Economics and Business.
  • Vasdekis, V. (2010). Analysis of Longitudinal Data, Lecture notes (only the theoretical part is described), Athens University of Economics and Business.

 

Subjects taught:

 

Statistics for Psychologists

Introduction to bootstrap methods in statistics

Design and Analysis of Experiments

Linear Models

Generalized Linear Models

Analysis of Longitudinal Data

Multivariate Analysis Methods

Statistical Methods in Medicine

Clinical Trials

 

 

 

Research Projects-Professional Experience

 

·         September 1996-January 1997: In cooperation with Ε.Κ.Κ.Ε «Understanding the “Stranger”: Racism in Greece».

  • January 1997-May 2001: Cooperation with the Greek Institute of Food during the European projects

DAFNE I: Methodology for the exploitation of Household Budget Surveys food data and results on food availability in 5 European countries.

DAFNE II: Network for the Pan-European food data bank based on Household Budget Surveys. Methodology for the exploitation of HBS food data and results on food availability, in six European countries.

FAIR-97-3096: Compatibility and Individual Nutrition Surveys in Europe and Disparities in Food Habits.

  • “Statistical analysis of Zyban administration against Placebo to smokers with COPD (2003). Project supported by the pharmaceutical industry GLAXO-WELLCOME.
  • “Statistical analysis of the open multicenter observational study investigating the long term administration of Topiramate as supplemental therapy to adults suffering from epilepsy (2002). Project supported by the pharmaceutical industry JANSSEN-CILAG.
  • “An investigation of mycosis occurrence frequency in Greece: the HERMES project” (2003). Project supported by the pharmaceutical industry JANSSEN-CILAG.
  • “Statistical analysis of the safety clinical study (PASS) investigating Risperidone administration as antipsychotic treatment, to adults chronic psychotic patients” (2003). Project supported by the pharmaceutical industry JANSSEN-CILAG.
  • “Statistical analysis of the open multicenter study investigating the effect of Epoetin-alfa administration during surgery, to patients suffering from CaP or BTCC” (2004).  Project supported by the pharmaceutical industry JANSSEN-CILAG.
  • “Statistical analysis of the open observational study investigating the effect of galantamine administration to patients suffering from mild to moderately sever senility of Alzheimer type” (2004). Project supported by the pharmaceutical industry JANSSEN-CILAG.
  • “Statistical analysis of a retrospective study comparing three therapeutic substances for the treatment of Alzheimer disease” (2005). Project supported by the pharmaceutical industry JANSSEN-CILAG.
  • “Statistical analysis of the open, observational, safety study, investigating Reminyl administration to patients suffering from mild to moderately severe Alzheimer disease” (2006). Project supported by the pharmaceutical industry JANSSEN-CILAG.
  • “Statistical analysis of the non interventional clinical study (PASS) investigating the effect of Rabeprazole administration to patients suffering from gastroesophageal reflux” (2006). ). Project supported by the pharmaceutical industry JANSSEN-CILAG.
  • “Statistical analysis of the open observational study investigating the effect of Rabeprazole administration to adults suffering from H. pylori” (2006). Project supported by the pharmaceutical industry JANSSEN-CILAG.
  • «An investigation of the penetration degree of the internet among dermatologists in Greece» (2009). Project supported by the pharmaceutical industry JANSSEN-CILAG.
  • “An open label safety clinical trial for the weekly Eprex (Epoetin-a) administration to patients with anaemia, who are subject to chemotherapy for tumors, lemphoma or myeloma” (2010). Project supported by the pharmaceutical industry JANSSEN-CILAG.
  • “PYTHAGORAS project: Research teams support to Universities”. Project title: Analysis of correlated binary data through synthesis of classic and Bayesian inferential techniques (2004).
  • “A pairwise likelihood inference in latent variable models  for ordinal responses”: Funded by the Basic Research Funding Programme, Athens University of Economics and Business, Academic year 2009/10.
  • “Composite likelihood inference in dynamic latent variable models for ordinal data”: Funded by the Basic Research Funding Programme, Athens University of Economics and Business, Academic year 2010/11.

 

 

Seminars

 

·        “Education based on the statistical package SPSS”, 48 hours, for the Greek Hematological Society, 2007-2008.

·        “Statistical education using SPSS statistical package”, a series of 8 hours seminars sponsored by JANSSEN-CILAG organized in Gennimatas hospital, Papanikolaou hospital, Aiginiteio hospital etc., 2008-2010.

·        “Applied Statistics, Clinical trials and practice using SPSS statistical package”, 12 hours for the Greek Anesthiological Society, 2009, 2010.

 

 

Research interests

 

I am particularly interested into modeling and estimation of longitudinal data. Currently, I deal with composite likelihood methods. In particular, I deal with the estimation of latent variable models in the context of multivariate longitudinal data. I also have a strong interest into proposals of distributions in RJMC in the context of GLM or GLMM. My other interests include

 

Multivariate Analysis
Semiparametric procedures
Medical applications and especially controlled clinical trials

Papers under preparation

  • Vasdekis, V.G.S, Kamma, J.J. (2010). REML estimation for joint mean-covariance models of unequally spaced longitudinal data: a periodontitis data example.
  • Dellaportas, P., Vasdekis, V.G.S. and Athanassopoulou, I. (2010). A modeling approach to correlated binary data.
  • Vasdekis, VGS, Cagnone, S and Moustaki, I (2010). A pairwise likelihood inference in latent variable models for ordinal longitudinal responses.

 

 

Publications

 

  •  Vlachonikolis, I. G. and Vasdekis, V. G. S. (1994). On a class of change-point models in Covariance Structures for Growth Curves and Repeated Measurements, Communications in Statistics (Theory and Methods), Vol. 23, No 4, 1087-1102.
  • Vasdekis, V. G. S. (1996). A Note on the Difference Between Two Likelihood Based Methods in Growth Curves. Communications in Statistics (Theory and methods), Vol. 25, No 9, 2093-2100.
  • Vasdekis, V.G.S. (1998). Models for the analysis of repeated categorical data. Psychologia, 5, 113-122.
  • Naska A., Vasdekis V.G.S. and Trichopoulou A. (2000). Fruit and vegetable availability among 10 European countries-how does it compare with five-a-day recommendation?. British Journal of Nutrition, 84, 549-556.
  • Vasdekis, V.G.S and Trichopoulou, A. (2000). Non parametric estimation of indibvidual food availability along with bootstrap confidence intervals in household budget surveys. Statistics and Probability letters, 46, 337-345.
  • Vasdekis, V.G.S., Stylianou, S. and Naska, A. (2001). Estimation of age- and gender-specific food availability from household budget survey data. Public Health Nutrition, 4(5Β), 1149-1151.
  • Naska, A., Vasdekis, V.G.S. and Trichopoulou, A. (2001). A preliminary assessment of the use of household budget survey data for prediction of individual food consumption. Public Health Nutrition, 4(5Β), 1159-1165.
  • Vasdekis, V.G.S (2003). Form and selection of covariance adjusted estimators in repeated measures models. Journal of Statistical Planning and Inference, 113, 239-248.
  • Kokkinaki, T. and Vasdekis, V.G.S. (2003). A cross-cultural study on early vocal imitative phenomena in different relationships. Journal of Reproductive and Infant Psychology, 21, 85-101
  • Kamma, J.J., Giannopoulou, C. Vasdekis, V.G.S. and Mombelli, A. (2004). Cytokine profile in gingival crevicular fluid of aggressive periodontitis: influence of smoking and stress. Journal of Clinical Periodontology, 31 (10), 894-902.
  • Vasdekis, V.G.S. and Vlachonikolis, I.G. (2005). On the difference between ML and REML estimators in the modeling of multivariate longitudinal data. Journal of Statistical Planning and Inference, 134 (1), 194-205.
  • Kamma, J.J., Vasdekis, V.G.S. and Romanos, G.E (2006). The short-term effect of diode laser (980 nm) treatment on aggressive periodontitis. Evaluation of clinical and microbiological parameters. Journal of Oral Laser Applications, 2, 111-121.
  • Giannopoulou, C., Mombelli, A., Tsinidou, K., Vasdekis, V. and Kamma, J. (2008). Detection of gingival crevicular fluid cytokines in children and adolescents with and without fixed orthodontic appliances. Acta Odontologica Scandinavica, 66 (3), 169-173.
  • Kamma, J., Mombelli, A., Tsinidou, K., Vasdekis, V., Giannopoulou, C.(2009). Cytokines in gingival crevicular fluid of adolescents and young adults. Oral Microbilogical Immunology, 24 (1), 7-10.
  •  Karlis, D., Vasdekis, V.G.S and Banti, M. (2009). Heteroscedastic semiparametric models for domestic water consumption. Environmental and Ecological Statistics 16(3), 355-367.
  • Vasdekis, V.G.S (2008). A comparison of REML and covariance adjustment method in the estimation of growth curve models. Comms in Statistics-theory and methods, 37 (20).
  • Cagnone S., Moustaki, I. and Vasdekis V. (2009). Latent variable models for multivariate longitudinal ordinal responses. British Journal of Mathematical and Statistical Psychology, 62, 401-415.

  • Papanas, N., Steiropoulos, P., Nena, E., Tzouvelekis, A., Skarlatos, A., Konsta, M., Vasdekis, V., Maltezos, E. and Bouros, D. (2010). Vascular Health Risk Management, 6(6), 281-286.

  • Andreadou, E., Anagnostouli, M., Vasdekis, V., Kararizou, E., Retzos, M., Kantaxis, T. and Evdokimidis, I. (2011). The impact of comorbidity and other clinical and sociodemographic factors on health-related quality of life in Greek patients with Parkinson’s disease. Aging Mental Health, 15(7), 913-921.
  • Papathomas, M., Dellaportas, P. and Vasdekis V.G.S. (2011). A novel reversible jump algorithm for generalized linear models. Biometrika, 98(1), 231-236.
  • Vasdekis, VGS, Cagnone, S and Moustaki, I (2012). A pairwise likelihood inference in latent variable models for ordinal longitudinal responses. Accepted by Psychometrika.

 

 

Chapters in books

 

  • Kokkinaki, T and Vasdekis, V.G.S. (2009). Gender as a determinant of emotional expressions in spontaneous infant-father interactions: an exploration study. In New Directions in Developmental Psychology, ed. Glemyn, B.C. and Zini, R.P., Nova Science.

 

 

Conference Proceedings

 

  • Nestoros J. N., Patakou-Parassiri, V., Sfakianakis, G. and Vasdekis, V. G. S. (1997). Clinical hypnosis in Ancient and Modern Greece. In P. J. Hawkins (Editor): Hypnosis in Europe.
  • Vasdekis, V. G. S. and Vlachonikolis I. G. (1997). ML and REML Estimation of Multivariate Repeated Measurements with Random Effects Covariance Structure. Computing Science and Statistics, 28, 514-520
  • Vassilakou T, Vasdekis VGS, Giannakoulia M and Trichopoulou A (1997). Difference of food availability between men and women in single person families. Proceedings of “Health and Woman” Conference, Athens 1997, 133-137.
  • Kamma, JJ., Romanos, G., Vasdekis, V. And Baehni, P.C. (2003). The short term effect of Diode Laser (980nm) curettage on aggressive periodontitis. Journal of Dental Research, 82 (special issue B):B228, abstract 1738 p.55.
  • Kamma, JJ., Tsinidou, K., Vasdekis, V., Mombelli, A. And Giannopoulou, C. (2004). Detection of GCF cytokines in children and adolescents. Journal of Dental Research, 83 (special issue B):B0438.
  • Kamma, JJ., Romanos, G. and Vasdekis, V. (2006). A 980 nm diode laser effect on clinical and microbial parameters of aggressive periodontitis. Journal of clinical Periodontology, 33 (supplement 7) abstract 209, 105
  • Kamma, JJ., Romanos, G. and Vasdekis, V. (2006). Effect of 980 nm diode laser on microbial parameters of aggressive periodontitis. Laser Zahnheilkunde, 2, (special issue abstracts of the 10th meeting of ISLD and 15th Annual Congress of DGL, Berlin, may 18-20, 2006), p.119.
  • Romanos, G., Kamma, JJ. and Vasdekis, V. (2006). Effect of diode laser (980 nm) treatment on clinical parameters of aggressive periodontitis. Laser Zahnheilkunde, 2, (special issue abstracts of the 10th meeting of ISLD and 15th Annual Congress of DGL, Berlin, may 18-20, 2006), p.144.
  • Kamma, J.J, Giannopoulou, C., Vasdekis, V and Baegni, P.C. (2003). The short-term effect of diode laser (980 mm) curettage on aggressive periodontitis. Journal of Dental Research, 82, B228, 1738, Sp. Iss B
  • Vasdekis, V.G.S., Cagnone, S. and Moustaki, I. (2010). A comparison of a pseudo-likelihood estimation and full information maximum likelihood estimation for fitting multivariate longitudinal ordinal data Proccedings of SIS 2010 Conference, Padua, 16-18 June 2010.

 

 

Conferences

 

  • Vlachonikolis I. G. and Vasdekis V. G. S. (1991). Non-Linear Models of Covariance Structures in Growth Curves and Repeated Measurements. Paper presented in the "European Conference of Statistics and Applied Probability" organized by the Bernoulli Society and held in Barcelona.
  • Nestoros, I. N., Vasdekis, V.G.S. and Research Group of the Department of Psychology of the University of Crete (1996). Research results in the Psychotherapy of Schizophrenia. Paper presented in the 14th Panhellenic Psychiatric Conference.
  • Vasdekis, V.G.S., Kokkinaki, N. and Kougioumoutzakis, I. (1996). Ways of Modern Microanalysis and Statistical Analysis in Developmental Psychology. Paper presented in the Panhellenic Conference of the Hellenic Psychological Society.
  • Vasdekis, V. G. S. and Vlachonikolis I. G. (1996). ML and REML Estimation of Multivariate Repeated Measurements with Random Effects Covariance Structure. Paper presented in the "Sydney International Statistical Congress" held in Sydney, Australia.
  • Vasdekis, V. G. S. and Vlachonikolis I. G. (1996). ML and REML Estimation of Multivariate Repeated Measurements with Random Effects Covariance Structure. Paper presented in the RSS Conference held in Guildford, Surrey, UK.
  • Vasdekis, V.G.S (1996). Models for the Analysis of Categorical Repeated Measures. Paper presented in a Symposium under the title “Methodological Matters in Psychology” organized by the Laboratory of General Psychology of the Department of Psychology of the University of Crete.
  • Kalaitzaki, A. E., Nestoros, J. N., Hawkins, P. J. and Vasdekis, V. G. S. (1997). The impact of schizophrenic symptoms on family's psychological well-being. Paper presented in the 1st European Conference on Psychotherapy held in Athens, September 11-14, 1997.
  • Friel S, Kelleher C and the DAFNE II group, (1997). Use of the Irish Household Budget Survey for food availability Estimation. Conference of the Irish Section of the Nutrition Society.
  • Trichopoulou A, Vasdekis V and the DAFNE Group, (1997). Alcoholic beverage availability at the household level in five European countries. 1st International Scientific Congress “Wine and Health”, Madrid.
  • Vasdekis, V. G. S. and Trichopoulou, A. (1999). Bootstrap CI in estimated curves using splines: An example to household budget survey data. 12th Panhellenic Statistical Conference, Spetses.
  • Karidis Ι., Giannakopoulou Ι., Trikallinou Α., Giannatou Ε., Adamidis S., Vasdekis V. and Panos G. (2001). Στατιστικό μοντέλο καταγραφής του ρυθμού μεταβολής των κυττάρων CD4 και του ιικού φορτίου από την έναρξη της αντιρετροικής αγωγής σε πεπειραμένους HIV (+) ασθενείς. 13ο Πανελλήνιο συνέδριο AIDS, Αθήνα. 31 Οκτωβρίου-2 Νοεμβρίου 2001.
  • Karidis Ι., Giannakopoulou Ι., Trikallinou Α., Giannatou Ε., Adamidis S., Vasdekis V. and Panos G. (2001). Στατιστικό μοντέλο καταγραφής του ρυθμού μεταβολής των κυττάρων CD4 και του ιικού φορτίου από την έναρξη της αντιρετροικής αγωγής σε μη πεπειραμένους HIV (+) ασθενείς. 13ο Πανελλήνιο συνέδριο AIDS, Αθήνα, 31 Οκτωβρίου-2 Νοεμβρίου 2001.
  • Giannakopoulou J., Karydis I., Trikkalinou E., Giannatou E., Panos G. and Vasdekis V. (2001). Statistical model tracing the rate of CD4-cell change since initiation of antiretroviral treatment in non-experienced HIV+ patients. Paper presented in the 8th European Conference on clinical aspects and treatment of HIV infection held in Athens, October 28-31, 2001.
  • Trikkalinou E.,Karydis I., Giannakopoulou J., Giannatou E., Vasdekis V. and Panos G. (2001). Statistical model tracing the rate of CD4-cell change since initiation of antiretroviral treatment in experienced HIV+ patients. Paper presented in the 8th European Conference on clinical aspects and treatment of HIV infection held in Athens, October 28-31, 2001.
  • Kamma, J.J., Romanos, G., Vasdekis, V.G.S., Baehni, P. (2003). Diode laser short-term effect on Periodontitis. Evaluation of clinical and microbiological parameters. Poster presented in the 81st General Session of the International Association for Dental Research.
  • Vasdekis, V.G.S. (2004). Unconstrained covariance adjusted estimators in growth curve models. 17th Panhellenic Statistical Conference, Lefkada.
  • Vasdekis, V.G.S. and Dellaportas, P. (2005). An approach to the analysis of multivariate ordinal repeated measures. 18th Panhellenic Statistical Conference, Rhodes.
  • Vasdekis, V.G.S. and Dellaportas, P. (2005). An approach to the analysis of multivariate ordinal repeated measures. EMR, 2nd Conference of Biometric Society, Corfu.
  • Papathomas, M., Dellaportas, P., Vasdekis, V.G.S. (2006). Proposal distributions for reversible jump Markov Chain Monte Carlo. Valencia 8-ISBA 2006 World Meeting on Bayesian Statistics, Spain, June 2006.
  • Cagnone, S., Vasdekis, V. and Moustaki, I. (2006). Dynamic factor analysis for categorical and metric variables. SMABS, EAM Conference 2006, Budapest.
  • Vasdekis, V.G.S. and Kamma, J. (2008). REML estimation for joint mean-covariance models of unequally spaced longitudinal data: a periodontitis data example. International Conference on Computational Statistics (COMPSTAT 2008), August 24-29, Porto Portugal.
  • Vasdekis, V.G.S., Cagnone, S. and Moustaki, I. (2009). Full and limited information methods for latent variable models for ordinal longitudinal data. International Meeting of Psychometric Society, July 20-24, Cambridge, UK.
  • Vasdekis, V.G.S., Cagnone, S. and Moustaki, I. (2010). A comparison of a pseudo-likelihood estimation and full information maximum likelihood estimation for fitting multivariate longitudinal ordinal data. Paper presented in the 2010 Conference of the Italian Statistical Society, Padua, 16-18 June 2010.
  • Vasdekis, V.G.S., Cagnone, S. and Moustaki, I. (2010). Full Pasirwise likelihood inference in latent variable models for ordinal longitudinal responses. 28th European Meeting of Statisticians (Bernoulli Society), August 18-22, Piraeus, Greece.
  • Vasdekis, V., Cagnone, S. and Moustaki, I. (2010). Limited and full information estimation methods for factor analysis models for longitudinal ordinal variables. RSS International Conference, Brighton September 13-17, 2010.

 

 

Other Publications

 

  • Nestoros J. N., Patakou-Parassiri, V., Sfakianakis, G. and Vasdekis, V. G. S. (1997). Clinical hypnosis in Ancient and Modern Greece. In P. J. Hawkins (Editor): Hypnosis in Europe (in press).
  • European Commission - Cooperation in Science and Technology with Central and Eastern European countries, COST 99 - Food consumption and composition data, DAFNE (DAta Food NEtworking) - Network for the Pan-European Food Data Bank based on Household Budget Surveys (HBS) data. Methodology for the exploitation of HBS food data and results on food availability in 5 European countries (ed. Trichopoulou A, Lagiou P.) EUR 17909 EN. Office for Official Publications of the European Communities, Luxembourg 1997.
  • DAFNE 2 (DAta Food NEtworking) - Network for the Pan-European Data Bank based on Household Budget Surveys (HBS) data. Methodology for the exploitation of HBS food data and results on food availability in six European countries. Final report (1998).
  • Trichopoulou, A., Lagiou, P., Nelson, M., Remaut-De Winter, A-M., Kelleher, C. Leohhauser, I., Moreiras, O., Schmitt, A., Wlodzimierz, S., Trygg, K. Zajkas, G. for the DAFNE I and II Projects of the European Commission (1999). Food Disparities in 10 European Countries: Their Detection Using Household Budget Survey Data-The Data Food Networking (DAFNE) Initiative. Nutrition Today, 34, 3, 129-139.

 

 

 

Societies

 

Fellow of the Royal Statistical Society

Member of the American Mathematical Society

Member of Bernoulli Society.