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Dr Stephan Kolassa

Honorary Researcher

  1. 2022
  2. Published

    Forecasting: theory and practice

    Petropoulos, F., Apiletti, D., Assimakopoulos, V., Babai, M. Z., Barrow, D. K., Ben Taieb, S., Bergmeir, C., Bessa, R. J., Bijak, J., Boylan, J. E., Browell, J., Carnevale, C., Castle, J. L., Cirillo, P., Clements, M. P., Cordeiro, C., Cyrino Oliveira, F. L., De Baets, S., Dokumentov, A., Ellison, J. & 60 others, Fiszeder, P., Franses, P. H., Frazier, D. T., Gilliland, M., Gönül, M. S., Goodwin, P., Grossi, L., Grushka-Cockayne, Y., Guidolin, M., Guidolin, M., Gunter, U., Guo, X., Guseo, R., Harvey, N., Hendry, D. F., Hollyman, R., Januschowski, T., Jeon, J., Jose, V. R. R., Kang, Y., Koehler, A. B., Kolassa, S., Kourentzes, N., Leva, S., Li, F., Litsiou, K., Makridakis, S., Martin, G. M., Martinez, A. B., Meeran, S., Modis, T., Nikolopoulos, K., Önkal, D., Paccagnini, A., Panagiotelis, A., Panapakidis, I., Pavía, J. M., Pedio, M., Pedregal, D. J., Pinson, P., Ramos, P., Rapach, D. E., Reade, J. J., Rostami-Tabar, B., Rubaszek, M., Sermpinis, G., Shang, H. L., Spiliotis, E., Syntetos, A. A., Talagala, P. D., Talagala, T. S., Tashman, L., Thomakos, D., Thorarinsdottir, T., Todini, E., Trapero Arenas, J. R., Wang, X., Winkler, R. L., Yusupova, A. & Ziel, F., 1/07/2022, In: International Journal of Forecasting. 38, 3, p. 705-871 167 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  3. 2021
  4. E-pub ahead of print

    Post-script - Retail forecasting: Research and Practice

    Fildes, R., Kolassa, S. & Ma, S., 17/11/2021, (E-pub ahead of print) In: International Journal of Forecasting.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  5. 2019
  6. E-pub ahead of print

    Retail forecasting: Research and practice

    Fildes, R., Ma, S. & Kolassa, S., 5/12/2019, (E-pub ahead of print) In: International Journal of Forecasting.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  7. Published

    Investigating the effects of childhood maltreatment on pro-inflammatory signaling: The influence of cortisol and DHEA on cytokine secretion ex vivo

    Geiger, M. L., Boeck, C., Koenig, A. M., Schury, K., Waller, C., Kolassa, S., Karabatsiakis, A. & Kolassa, I. T., 1/03/2019, In: Mental Health & Prevention. 13, p. 176-186 11 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  8. 2018
  9. Published

    Retail forecasting: research and practice

    Fildes, R. A., Ma, S. & Kolassa, S., 10/2018, Lancaster.

    Research output: Working paper

  10. 2016
  11. Published

    Evaluating Predictive Count Data Distributions in Retail Sales Forecasting

    Kolassa, S., 1/07/2016, In: International Journal of Forecasting. 32, 3, p. 788-803 16 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  12. Published

    Supply chain forecasting: theory, practice, their gap and the future

    Syntetos, A., Babai, Z., Boylan, J. E., Kolassa, S. & Nikolopoulos, K., 1/07/2016, In: European Journal of Operational Research. 252, 1, p. 1-26 26 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  13. Published

    Sometimes It's Better to be Simple Than Correct

    Kolassa, S., 1/01/2016, In: Foresight. 2016, 40, p. 20-26 7 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  14. 2015
  15. Published

    How to quantify exposure to traumatic stress? Reliability and predictive validity of measures for cumulative trauma exposure in a post-conflict population

    Wilker, S., Pfeiffer, A., Kolassa, S., Koslowski, D., Elbert, T. & Kolassa, I-T., 1/12/2015, In: European Journal of Psychotraumatology. 6, 1, 10 p., 28306.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  16. Published

    Metabolite profiling in posttraumatic stress disorder

    Karabatsiakis, A., Hamuni, G., Wilker, S., Kolassa, S., Renu, D., Kadereit, S., Schauer, M., Hennessy, T. & Kolassa, I-T., 2015, In: Journal of Molecular Psychiatry. 3, 1, 11 p., 2.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  17. Published

    Retail analytics: integrated forecasting and inventory management for perishable products in retailing: Book review

    Kolassa, S., 2015, In: Journal of the Operational Research Society. 66, 12, p. 2103-2104 2 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  18. 2014
  19. Published

    The effect of trauma-focused therapy on the altered T cell distribution in individuals with PTSD: Evidence from a randomized controlled trial

    Morath, J., Gola, H., Sommershof, A., Hamuni, G., Kolassa, S., Catani, C., Adenauer, H., Ruf-Leuschner, M., Schauer, M., Elbert, T., Groettrup, M. & Kolassa, I-T., 1/07/2014, In: Journal of Psychiatric Research. 54, p. 1-10 10 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  20. Published

    Effects of psychotherapy on DNA strand break accumulation originating from traumatic stress

    Morath, J., Moreno-Villanueva, M., Hamuni, G., Kolassa, S., Ruf-Leuschner, M., Schauer, M., Elbert, T., Bürkle, A. & Kolassa, I-T., 2014, In: Psychotherapy and Psychosomatics. 83, 5, p. 289-297 9 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  21. Published

    Mitochondrial respiration in peripheral blood mononuclear cells correlates with depressive subsymptoms and severity of major depression

    Karabatsiakis, A., Böck, C., Salinas-Manrique, J., Kolassa, S., Calzia, E., Dietrich, D. E. & Kolassa, I-T., 2014, In: Translational Psychiatry. 4, 7 p., e397.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  22. Published

    Telomere shortening in leukocyte subpopulations in depression

    Karabatsiakis, A., Kolassa, I-T., Kolassa, S., Rudolph, K. L. & Dietrich, D. E., 2014, In: BMC Psychiatry. 14, 7 p., 192.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  23. Published

    The role of FKBP5 genotype in moderating long-term effectiveness of exposure-based psychotherapy for posttraumatic stress disorder

    Wilker, S., Pfeiffer, A., Kolassa, S., Elbert, T., Lingenfelder, B., Ovuga, E., Papassotiropoulos, A., De Quervain, D. & Kolassa, I-T., 2014, In: Translational Psychiatry. 4, 7 p., e403.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  24. 2013
  25. Published

    The Role of Memory-related Gene WWC1 (KIBRA) in Lifetime Posttraumatic Stress Disorder: Evidence from Two Independent Samples from African Conflict Regions

    Wilker, S., Kolassa, S., Vogler, C., Lingenfelder, B., Elbert, T., Papassotiropoulos, A., de Quervain, D. J-F. & Kolassa, I-T., 1/11/2013, In: Biological Psychiatry. 74, 9, p. 664-671 8 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  26. Published

    Posttraumatic stress disorder is associated with an enhanced spontaneous production of pro-inflammatory cytokines by peripheral blood mononuclear cells

    Gola, H., Engler, H., Sommershof, A., Adenauer, H., Kolassa, S., Schedlowski, M., Groettrup, M., Elbert, T. & Kolassa, I-T., 31/01/2013, In: BMC Psychiatry. 13, 1, 8 p., 40.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  27. Published

    Effects of aging and mild cognitive impairment on electrophysiological correlates of performance monitoring

    Thurm, F., Antonenko, D., Schlee, W., Kolassa, S., Elbert, T. & Kolassa, I-T., 2013, In: Journal of Alzheimer's Disease. 35, 3, p. 575-587 13 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  28. Published

    Forecasting and optimisation for big data: Lessons from the retail business

    Kolassa, S., 2013, OR55 Keynotes and Extended Abstracts - 55th Conference of the Operational Research Society 2013. Operational Research Society

    Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSNConference contribution/Paperpeer-review

  29. Published

    Forecasting to Meet Demand

    Martin, R. & Kolassa, S., 2013, In: Foresight: The International Journal of Applied Forecasting. 28, p. 5-11 7 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  30. Published

    Forecasting with In-Memory Technology

    Januschowski, T., Kolassa, S., Lorenz, M. & Schwarz, C., 2013, In: Foresight: The International Journal of Applied Forecasting. 31, p. 14-20 7 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  31. Published

    N-glycosylation profiling of plasma provides evidence for accelerated physiological aging in post-traumatic stress disorder

    Moreno-Villanueva, M., Morath, J., Vanhooren, V., Elbert, T., Kolassa, S., Libert, C., Bürkle, A. & Kolassa, I-T., 2013, In: Translational Psychiatry. 3, 5 p., e320.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  32. 2012
  33. Published

    Development of Large-Scale Functional Networks over the Lifespan

    Schlee, W., Leirer, V. M., Kolassa, S., Thurm, F., Elbert, T. & Kolassa, I. T., 1/10/2012, In: Neurobiology of Aging. 33, 10, p. 2411-2421 11 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  34. Published

    Two Notable New Forecasting Texts

    Kolassa, S., 2012, In: Foresight: The International Journal of Applied Forecasting. 27, p. 40-45 6 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  35. Published

    Victims of rape show increased cortisol responses to trauma reminders: A study in individuals with war- and torture-related PTSD

    Gola, H., Engler, H., Schauer, M., Adenauer, H., Riether, C., Kolassa, S., Elbert, T. & Kolassa, I-T., 2012, In: Psychoneuroendocrinology. 37, 2, p. 213-220 8 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  36. 2011
  37. Published

    Improvement of cognitive function after physical movement training in institutionalized very frail older adults with dementia

    Thurm, F., Scharpf, A., Liebermann, N., Kolassa, S., Elbert, T., Luchtenberg, D., Woll, A. & Kolassa, I. T., 31/12/2011, In: GeroPsych: The Journal of Gerontopsychology and Geriatric Psychiatry. 24, 4, p. 197-208 12 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  38. Published

    Combining exponential smoothing forecasts using Akaike weights

    Kolassa, S., 1/04/2011, In: International Journal of Forecasting. 27, 2, p. 238-251 14 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  39. Published

    Changes in cortical slow wave activity in healthy aging

    Leirer, V. M., Wienbruch, C., Kolassa, S., Schlee, W., Elbert, T. & Kolassa, I-T., 2011, In: Brain imaging and behavior. 5, 3, p. 222–228 7 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  40. Published

    Percentage Errors Can Ruin Your Day (and Rolling the Dice Shows How)

    Kolassa, S. & Martin, R., 2011, In: Foresight: The International Journal of Applied Forecasting. 23, p. 21-27 7 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  41. Published

    The Business Forecasting Deal

    Kolassa, S., 2011, In: International Journal of Forecasting. 27, 2, p. 631-633 4 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  42. 2010
  43. Published

    Association study of trauma load and SLC6A4 promoter polymorphism in PTSD: evidence from survivors of the Rwandan genocide

    Kolassa, I. T., Ertl, V., Eckart, C., Glockner, F., Kolassa, S., Papassotiropoulos, A., De Quervain, D. & Elbert, T., 1/05/2010, In: Journal of Clinical Psychiatry. 71, 5, p. 543-547 5 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  44. Published

    Free Open-Source Forecasting Using R

    Kolassa, S. & Hyndman, R. J., 2010, In: Foresight: The International Journal of Applied Forecasting. 17, p. 19-23 5 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  45. Published

    Hippocampal activity during the transverse patterning task declines with cognitive competence but not with age

    Leirer, V. M., Wienbruch, C., Paul-Jordanov, I., Kolassa, S., Elbert, T. & Kolassa, I. T., 2010, In: BMC Neuroscience. 11, 10 p., 113.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  46. Published

    Spontaneous remission from PTSD depends on the number of traumatic event types experienced

    Kolassa, S., Ertl, V., Eckart, C., Kolassa, S., Onyut, L. P. & Elbert, T., 2010, In: Psychological Trauma: Theory, Research, Practice, and Policy. 2, 3, p. 169-174 6 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  47. Published

    The Risk of Posttraumatic Stress Disorder After Trauma Depends on Traumatic Load and the Catechol-O-Methyltransferase Val158Met Polymorphism

    Kolassa, I. T., Kolassa, S., Ertl, V., Papassotiropoulos, A. & De Quervain, D., 2010, In: Biological Psychiatry. 67, 4, p. 304-308 5 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  48. 2009
  49. Published

    How to assess forecastability

    Kolassa, S., 2009, In: Foresight: The International Journal of Applied Forecasting. 13, p. 41-45 5 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  50. Published

    Interpretive bias in social phobia: An ERP study with morphed emotional schematic faces

    Kolassa, I. T., Kolassa, S., Bergmann, S., Lauche, R., Dilger, S. & Miltner, W. H. R., 2009, In: Cognition and Emotion. 23, 1, p. 69-95 27 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  51. Published

    No PTSD-related differences in diurnal cortisol profiles of genocide survivors

    Eckart, C., Engler, H., Riether, C., Kolassa, S., Elbert, T. & Kolassa, I. T., 2009, In: Psychoneuroendocrinology. 34, 4, p. 523-531 9 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  52. 2008
  53. Published

    Can we obtain valid benchmarks from published surveys of forecast accuracy?

    Kolassa, S., 2008, In: Foresight: The International Journal of Applied Forecasting. 11, p. 6-25 20 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  54. 2007
  55. Published

    Advantages of the MAD/Mean ratio over the MAPE

    Kolassa, S., 2007, In: Foresight. 2007, 6, p. 40-43 4 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  56. Published

    Event-related potentials to schematic faces in social phobia

    Kolassa, I. T., Kolassa, S., Musial, F. & Miltner, W. H. R., 2007, In: Cognition and Emotion. 21, 8, p. 1721-1744 24 p.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  57. Published

    Spider phobics more easily see a spider in morphed schematic pictures

    Kolassa, S., 2007, In: Behavioral and Brain Functions. 2007, 3, 15 p., 59.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  58. 2006
  59. Published

    Event-related potentials when identifying or color-naming threatening schematic stimuli in spider phobic and non-phobic individuals

    Kolassa, I-T., Musial, F., Kolassa, S. & Miltner, W. H. R., 2006, In: BMC Psychiatry. 6, 12 p., 38.

    Research output: Contribution to Journal/MagazineJournal articlepeer-review

  60. 2005
  61. Published

    Two-Step Drawing From Urns

    Kolassa, S., 2005, Operations Research Proceedings 2004. Fleurin, H., den Hertog, D. & Kort, P. (eds.). Springer, p. 313-318 6 p. (Operations Research Proceedings).

    Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSNConference contribution/Paperpeer-review

  62. 2004
  63. Published

    Multi-Step Shortlisting by Imperfect Experts

    Kolassa, S., 2004, Jena: 3-Hirn-Verlag. 119 p.

    Research output: Book/Report/ProceedingsBook

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