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Dr Stephan Kolassa

Honorary Researcher

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  1. 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

  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. 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/Magazine › Journal article › peer-review

  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

    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

  6. 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/Magazine › Journal article › peer-review

  7. 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

  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

    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/Magazine › Journal article › peer-review

  10. 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/Magazine › Journal article › peer-review

  11. 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

  12. 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/Magazine › Journal article › peer-review

  13. 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

  14. 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

  15. 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

  16. 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

  17. 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

  18. 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

  19. 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

  20. 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

  21. 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

  22. 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

  23. 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

  24. 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

  25. 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/Magazine › Journal article › peer-review

  26. 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/Magazine › Journal article › peer-review

  27. 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

  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/ISSN › Conference contribution/Paper › peer-review

  29. 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

  30. 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

  31. 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

  32. 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/Magazine › Journal article › peer-review

  33. 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

  34. 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/Magazine › Journal article › peer-review

  35. 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/Magazine › Journal article › peer-review

  36. 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

  37. 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

  38. 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/Magazine › Journal article › peer-review

  39. 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

  40. 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/Magazine › Journal article › peer-review

  41. 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

  42. 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

  43. 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

  44. 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

  45. 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

  46. Published

    Multi-Step Shortlisting by Imperfect Experts

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

    Research output: Book/Report/Proceedings › Book

  47. 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

  48. 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/Magazine › Journal article › peer-review

  49. 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/Magazine › Journal article › peer-review

  50. 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

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