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Dr Stephan Kolassa

Honorary Researcher

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  1. 2024
  2. Published

    Accuracy vs. Runtime with Multiple Seasonalities

    Kolassa, S., 1/01/2024, In: Foresight: The International Journal of Applied Forecasting. 72, p. 29-32 4 p.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  3. 2023
  4. Published

    All Hail the Flatline Forecast!

    Kolassa, S., 1/10/2023, In: Foresight: The International Journal of Applied Forecasting. 70, p. 62-63 2 p.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  5. Published

    Do we want coherent hierarchical forecasts, or minimal MAPEs or MAEs? (We won't get both!)

    Kolassa, S., 1/10/2023, In: International Journal of Forecasting. 39, 4, p. 1512-1517 6 p.

    Research output: Contribution to Journal/Magazine › Comment/debate › peer-review

  6. Published

    Sustainability in Forecasting

    Kolassa, S., 1/10/2023, In: Foresight: The International Journal of Applied Forecasting. 71, p. 75-76 2 p.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  7. Published

    Demand Forecasting for Executives and Professionals

    Kolassa, S., Rostami-Tabar, B. & Siemsen, E., 29/09/2023, CRC Press. 254 p.

    Research output: Book/Report/Proceedings › Book

  8. Published

    Book Review of Demand Forecasting Best Practices by Nicolas Vandeput

    Kolassa, S., 1/07/2023, In: Foresight: The International Journal of Applied Forecasting. 70, p. 43-44 2 p.

    Research output: Contribution to Journal/Magazine › Book/Film/Article review › peer-review

  9. Published

    Commentary: How We Deal with Zero Actuals Has a Huge Impact on the MAPE and Optimal Forecasts

    Kolassa, S., 1/04/2023, In: Foresight: The International Journal of Applied Forecasting. p. 13-16 4 p.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  10. Published

    Commentary: When to Be Careful about Forecasting

    Kolassa, S., 1/04/2023, In: Foresight: The International Journal of Applied Forecasting. 69, p. 25-27 3 p.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  11. Published

    How to Increase Forecast Accuracy

    Kolassa, S., 1/04/2023, In: Foresight: The International Journal of Applied Forecasting. 69, p. 59-60 2 p.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  12. Published

    Minitutorial: The Pinball Loss for Quantile Forecasts

    Kolassa, S., 1/01/2023, In: Foresight: The International Journal of Applied Forecasting. 68, p. 66-67 2 p.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  13. Published

    Using Simulation to Determine When Forecast Accuracy Matters

    Kolassa, S., 1/01/2023, In: Foresight: The International Journal of Applied Forecasting. 68, p. 20-24 5 p.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  14. 2022
  15. Published

    Retail forecasting: Research and practice

    Fildes, R., Ma, S. & Kolassa, S., 1/12/2022, In: International Journal of Forecasting. 38, 4, p. 1283-1318 36 p.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  16. Published

    Commentary on the M5 forecasting competition

    Kolassa, S., 31/10/2022, In: International Journal of Forecasting. 38, 4, p. 1562-1568 7 p.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  17. Published

    Post-script - Retail forecasting: Research and Practice

    Fildes, R., Kolassa, S. & Ma, S., 31/10/2022, In: International Journal of Forecasting. 38, 4, p. 1319-1324 6 p.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  18. 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 othersFiszeder, 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/Magazine › Journal article › peer-review

  19. 2021
  20. Published

    Sex differences in PTSD risk: evidence from post-conflict populations challenges the general assumption of increased vulnerability in females

    Wilker, S., Kolassa, S., Ibrahim, H., Rajan, V., Pfeiffer, A., Catani, C. & Kolassa, I. T., 31/12/2021, In: European journal of psychotraumatology. 12, 1, 1930702.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  21. Published

    A Classification of Business Forecasting Problems

    Januschowski, T. & Kolassa, S., 1/04/2021, Business Forecasting: The Emerging Role of Artificial Intelligence and Machine Learning. Gilliland, M., Tashman, L. & Sglavo, U. (eds.). Wiley, p. 171-181 11 p.

    Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSN › Chapter

  22. Published

    Commentary: Big Data or Big Hype?

    Kolassa, S., 1/04/2021, Business Forecasting: The Emerging Role of Artificial Intelligence and Machine Learning. Gilliland, M., Tashman, L. & Sglavo, U. (eds.). Wiley, p. 148-149 2 p.

    Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSN › Chapter

  23. Published

    Forecasting the Future of Retail Forecasting

    Kolassa, S., 1/04/2021, Business Forecasting: The Emerging Role of Artificial Intelligence and Machine Learning. Gilliland, M., Tashman, L. & Sglavo, U. (eds.). Wiley, p. 243-254 12 p.

    Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSN › Chapter

  24. Published

    Know Your Time Series

    Kolassa, S. & Siemsen, E., 1/04/2021, Business Forecasting: The Emerging Role of Artificial Intelligence and Machine Learning. Gilliland, M., Tashman, L. & Sglavo, U. (eds.). Wiley, p. 164-170 7 p.

    Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSN › Chapter

  25. Published

    Will Deep and Machine Learning Solve Our Forecasting Problems?

    Kolassa, S., 1/04/2021, Business Forecasting: The Emerging Role of Artificial Intelligence and Machine Learning. Gilliland, M., Tashman, L. & Sglavo, U. (eds.). Wiley, p. 65-71 7 p.

    Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSN › Chapter

  26. 2020
  27. Published

    Why the “best” point forecast depends on the error or accuracy measure

    Kolassa, S., 31/03/2020, In: International Journal of Forecasting. 36, 1, p. 208-211

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  28. Published

    Integrated genetic, epigenetic, and gene set enrichment analyses identify NOTCH as a potential mediator for PTSD risk after trauma: Results from two independent African cohorts

    Conrad, D., Wilker, S., Schneider, A., Karabatsiakis, A., Pfeiffer, A., Kolassa, S., Freytag, V., Vukojevic, V., Vogler, C., Milnik, A., Papassotiropoulos, A., J.-F. de Quervain, D., Elbert, T. & Kolassa, I. T., 1/01/2020, In: Psychophysiology. 57, 1, e13288.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  29. 2019
  30. 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/Magazine › Journal article › peer-review

  31. 2018
  32. Published

    Genetic variation is associated with PTSD risk and aversive memory: Evidence from two trauma-Exposed African samples and one healthy European sample

    Wilker, S., Schneider, A., Conrad, D., Pfeiffer, A., Boeck, C., Lingenfelder, B., Freytag, V., Vukojevic, V., Vogler, C., Milnik, A., Papassotiropoulos, A., J.-F. de Quervain, D., Elbert, T., Kolassa, S. & Kolassa, I. T., 1/12/2018, In: Translational Psychiatry. 8, 1, 251.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  33. Published

    Commentary on Retail Forecasting

    Kolassa, S., 1/10/2018, In: International Journal of Forecasting. 34, 4, p. 830-831 2 p.

    Research output: Contribution to Journal/Magazine › Comment/debate › peer-review

  34. Published

    Retail forecasting: research and practice

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

    Research output: Working paper

  35. Published

    Auditory memory decay as reflected by a new mismatch negativity score is associated with episodic memory in older adults at risk of dementia

    Laptinskaya, D., Thurm, F., Küster, O. C., Fissler, P., Schlee, W., Kolassa, S., von Arnim, C. A. F. & Kolassa, I. T., 2/02/2018, In: Frontiers in Aging Neuroscience. 10, FEB, 5.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  36. 2017
  37. Published

    Does trauma event type matter in the assessment of traumatic load?

    Conrad, D., Wilker, S., Pfeiffer, A., Lingenfelder, B., Ebalu, T., Lanzinger, H., Elbert, T., Kolassa, I. T. & Kolassa, S., 30/09/2017, In: European journal of psychotraumatology. 8, 1, 1344079.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  38. Published

    Alterations of hair cortisol and dehydroepiandrosterone in mother-infant-dyads with maternal childhood maltreatment

    Schury, K., Koenig, A. M., Isele, D., Hulbert, A. L., Krause, S., Umlauft, M., Kolassa, S., Ziegenhain, U., Karabatsiakis, A., Reister, F., Guendel, H., Fegert, J. M. & Kolassa, I. T., 6/06/2017, In: BMC Psychiatry. 17, 1, 213.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  39. 2016
  40. Published

    Cognitive change is more positively associated with an active lifestyle than with training interventions in older adults at risk of dementia: A controlled interventional clinical trial

    Küster, O. C., Fissler, P., Laptinskaya, D., Thurm, F., Scharpf, A., Woll, A., Kolassa, S., Kramer, A. F., Elbert, T., von Arnim, C. A. F. & Kolassa, I. T., 8/09/2016, In: BMC Psychiatry. 16, 1, 315.

    Research output: Contribution to Journal/Magazine › Journal article › peer-review

  41. 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/Magazine › Journal article › peer-review

  42. 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/Magazine › Journal article › peer-review

  43. 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/Magazine › Journal article › peer-review

  44. 2015
  45. 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/Magazine › Journal article › peer-review

  46. 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/Magazine › Journal article › peer-review

  47. 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/Magazine › Journal article › peer-review

  48. 2014
  49. 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/Magazine › Journal article › peer-review

  50. 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/Magazine › Journal article › peer-review

  51. 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/Magazine › Journal article › peer-review

  52. 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/Magazine › Journal article › peer-review

  53. 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/Magazine › Journal article › peer-review

  54. 2013
  55. 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/Magazine › Journal article › peer-review

  56. 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/Magazine › Journal article › peer-review

  57. 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/Magazine › Journal article › peer-review

  58. 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/ISSN › Conference contribution/Paper › peer-review

  59. 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/Magazine › Journal article › peer-review

  60. 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/Magazine › Journal article › peer-review

  61. 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/Magazine › Journal article › peer-review

  62. 2012
  63. 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/Magazine › Journal article › peer-review

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