Items where Author is "Kolassa, Stephan"

Journal Article

Kolassa, Stephan (2024) Accuracy vs. Runtime with Multiple Seasonalities. Foresight: The International Journal of Applied Forecasting, 72. pp. 29-32. ISSN 1555-9068

Kolassa, Stephan (2023) All Hail the Flatline Forecast! Foresight: The International Journal of Applied Forecasting, 70. pp. 62-63. ISSN 1555-9068

Kolassa, Stephan (2023) Do we want coherent hierarchical forecasts, or minimal MAPEs or MAEs? (We won't get both!). International Journal of Forecasting, 39 (4). pp. 1512-1517. ISSN 0169-2070

Kolassa, Stephan (2023) Sustainability in Forecasting. Foresight: The International Journal of Applied Forecasting, 71. pp. 75-76. ISSN 1555-9068

Kolassa, Stephan (2023) Book Review of Demand Forecasting Best Practices by Nicolas Vandeput. Foresight: The International Journal of Applied Forecasting, 70. pp. 43-44. ISSN 1555-9068

Kolassa, Stephan (2023) Commentary: How We Deal with Zero Actuals Has a Huge Impact on the MAPE and Optimal Forecasts. Foresight: The International Journal of Applied Forecasting. pp. 13-16. ISSN 1555-9068

Kolassa, Stephan (2023) Commentary: When to Be Careful about Forecasting. Foresight: The International Journal of Applied Forecasting, 69. pp. 25-27. ISSN 1555-9068

Kolassa, Stephan (2023) How to Increase Forecast Accuracy. Foresight: The International Journal of Applied Forecasting, 69. pp. 59-60. ISSN 1555-9068

Kolassa, Stephan (2023) Minitutorial: The Pinball Loss for Quantile Forecasts. Foresight: The International Journal of Applied Forecasting, 68. pp. 66-67. ISSN 1555-9068

Kolassa, Stephan (2023) Using Simulation to Determine When Forecast Accuracy Matters. Foresight: The International Journal of Applied Forecasting, 68. pp. 20-24. ISSN 1555-9068

Fildes, Robert and Ma, Shaohui and Kolassa, Stephan (2022) Retail forecasting : Research and practice. International Journal of Forecasting, 38 (4). pp. 1283-1318. ISSN 0169-2070

Kolassa, Stephan (2022) Commentary on the M5 forecasting competition. International Journal of Forecasting, 38 (4). pp. 1562-1568. ISSN 0169-2070

Fildes, Robert and Kolassa, Stephan and Ma, Shaohui (2022) Post-script - Retail forecasting : Research and Practice. International Journal of Forecasting, 38 (4). pp. 1319-1324. ISSN 0169-2070

Petropoulos, Fotios and Apiletti, Daniele and Assimakopoulos, Vassilios and Babai, Mohamed Zied and Barrow, Devon K. and Ben Taieb, Souhaib and Bergmeir, Christoph and Bessa, Ricardo J. and Bijak, Jakub and Boylan, John E. and Browell, Jethro and Carnevale, Claudio and Castle, Jennifer L. and Cirillo, Pasquale and Clements, Michael P. and Cordeiro, Clara and Cyrino Oliveira, Fernando Luiz and De Baets, Shari and Dokumentov, Alexander and Ellison, Joanne and Fiszeder, Piotr and Franses, Philip Hans and Frazier, David T. and Gilliland, Michael and Gönül, M. Sinan and Goodwin, Paul and Grossi, Luigi and Grushka-Cockayne, Yael and Guidolin, Mariangela and Guidolin, Massimo and Gunter, Ulrich and Guo, Xiaojia and Guseo, Renato and Harvey, Nigel and Hendry, David F. and Hollyman, Ross and Januschowski, Tim and Jeon, Jooyoung and Jose, Victor Richmond R. and Kang, Yanfei and Koehler, Anne B. and Kolassa, Stephan and Kourentzes, Nikolaos and Leva, Sonia and Li, Feng and Litsiou, Konstantia and Makridakis, Spyros and Martin, Gael M. and Martinez, Andrew B. and Meeran, Sheik and Modis, Theodore and Nikolopoulos, Konstantinos and Önkal, Dilek and Paccagnini, Alessia and Panagiotelis, Anastasios and Panapakidis, Ioannis and Pavía, Jose M. and Pedio, Manuela and Pedregal, Diego J. and Pinson, Pierre and Ramos, Patrícia and Rapach, David E. and Reade, J. James and Rostami-Tabar, Bahman and Rubaszek, Michał and Sermpinis, Georgios and Shang, Han Lin and Spiliotis, Evangelos and Syntetos, Aris A. and Talagala, Priyanga Dilini and Talagala, Thiyanga S. and Tashman, Len and Thomakos, Dimitrios and Thorarinsdottir, Thordis and Todini, Ezio and Trapero Arenas, Juan Ramón and Wang, Xiaoqian and Winkler, Robert L. and Yusupova, Alisa and Ziel, Florian (2022) Forecasting : theory and practice. International Journal of Forecasting, 38 (3). pp. 705-871. ISSN 0169-2070

Wilker, Sarah and Kolassa, Stephan and Ibrahim, Hawkar and Rajan, Vathsalan and Pfeiffer, Anett and Catani, Claudia and Kolassa, Iris Tatjana (2021) Sex differences in PTSD risk : evidence from post-conflict populations challenges the general assumption of increased vulnerability in females. European journal of psychotraumatology, 12 (1): 1930702. ISSN 2000-8198

Kolassa, Stephan (2020) Why the “best” point forecast depends on the error or accuracy measure. International Journal of Forecasting, 36 (1). pp. 208-211. ISSN 0169-2070

Conrad, Daniela and Wilker, Sarah and Schneider, Anna and Karabatsiakis, Alexander and Pfeiffer, Anett and Kolassa, Stephan and Freytag, Virginie and Vukojevic, Vanja and Vogler, Christian and Milnik, Annette and Papassotiropoulos, Andreas and J.-F. de Quervain, Dominique and Elbert, Thomas and Kolassa, Iris Tatjana (2020) 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. Psychophysiology, 57 (1): e13288. ISSN 0048-5772

Geiger, Martha Leonie and Boeck, Christina and Koenig, Alexandra Maria and Schury, Katharina and Waller, Christiane and Kolassa, Stephan and Karabatsiakis, Alexander and Kolassa, Iris- Tatjana (2019) Investigating the effects of childhood maltreatment on pro-inflammatory signaling : The influence of cortisol and DHEA on cytokine secretion ex vivo. Mental Health & Prevention, 13. pp. 176-186.

Wilker, Sarah and Schneider, Anna and Conrad, Daniela and Pfeiffer, Anett and Boeck, Christina and Lingenfelder, Birke and Freytag, Virginie and Vukojevic, Vanja and Vogler, Christian and Milnik, Annette and Papassotiropoulos, Andreas and J.-F. de Quervain, Dominique and Elbert, Thomas and Kolassa, Stephan and Kolassa, Iris Tatjana (2018) Genetic variation is associated with PTSD risk and aversive memory : Evidence from two trauma-Exposed African samples and one healthy European sample. Translational Psychiatry, 8 (1): 251. ISSN 2158-3188

Kolassa, Stephan (2018) Commentary on Retail Forecasting. International Journal of Forecasting, 34 (4). pp. 830-831. ISSN 0169-2070

Laptinskaya, Daria and Thurm, Franka and Küster, Olivia C. and Fissler, Patrick and Schlee, Winfried and Kolassa, Stephan and von Arnim, Christine A.F. and Kolassa, Iris Tatjana (2018) Auditory memory decay as reflected by a new mismatch negativity score is associated with episodic memory in older adults at risk of dementia. Frontiers in Aging Neuroscience, 10 (FEB): 5. ISSN 1663-4365

Conrad, Daniela and Wilker, Sarah and Pfeiffer, Anett and Lingenfelder, Birke and Ebalu, Tracie and Lanzinger, Hartmut and Elbert, Thomas and Kolassa, Iris Tatjana and Kolassa, Stephan (2017) Does trauma event type matter in the assessment of traumatic load? European journal of psychotraumatology, 8 (1): 1344079. ISSN 2000-8198

Küster, Olivia C. and Fissler, Patrick and Laptinskaya, Daria and Thurm, Franka and Scharpf, Andrea and Woll, Alexander and Kolassa, Stephan and Kramer, Arthur F. and Elbert, Thomas and von Arnim, Christine A.F. and Kolassa, Iris Tatjana (2016) 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. BMC Psychiatry, 16 (1): 315. ISSN 1471-244X

Kolassa, Stephan (2016) Evaluating Predictive Count Data Distributions in Retail Sales Forecasting. International Journal of Forecasting, 32 (3). pp. 788-803. ISSN 0169-2070

Syntetos, Aris and Babai, Zied and Boylan, John Edward and Kolassa, Stephan and Nikolopoulos, Konstantinos (2016) Supply chain forecasting : theory, practice, their gap and the future. European Journal of Operational Research, 252 (1). pp. 1-26. ISSN 0377-2217

Kolassa, Stephan (2016) Sometimes It's Better to be Simple Than Correct. Foresight, 2016 (40). pp. 20-26. ISSN 1463-6689

Wilker, Sarah and Pfeiffer, Anett and Kolassa, Stephan and Koslowski, Daniela and Elbert, Thomas and Kolassa, Iris-Tatjana (2015) How to quantify exposure to traumatic stress? Reliability and predictive validity of measures for cumulative trauma exposure in a post-conflict population. European Journal of Psychotraumatology, 6 (1): 28306. ISSN 2000-8198

Karabatsiakis, Alexander and Hamuni, Gilava and Wilker, Sarah and Kolassa, Stephan and Renu, Durairaj and Kadereit, Suzanne and Schauer, Maggie and Hennessy, Thomas and Kolassa, Iris-Tatjana (2015) Metabolite profiling in posttraumatic stress disorder. Journal of Molecular Psychiatry, 3 (1): 2. ISSN 2049-9256

Kolassa, Stephan (2015) Retail analytics: integrated forecasting and inventory management for perishable products in retailing : Book review. Journal of the Operational Research Society, 66 (12). pp. 2103-2104. ISSN 0160-5682

Wilker, Sarah and Kolassa, Stephan and Vogler, Christian and Lingenfelder, Birke and Elbert, Thomas and Papassotiropoulos, Andreas and de Quervain, Dominique J.-F. and Kolassa, Iris-Tatjana (2013) The Role of Memory-related Gene WWC1 (KIBRA) in Lifetime Posttraumatic Stress Disorder : Evidence from Two Independent Samples from African Conflict Regions. Biological Psychiatry, 74 (9). pp. 664-671. ISSN 0006-3223

Gola, Hannah and Engler, Harald and Sommershof, Annette and Adenauer, Hannah and Kolassa, Stephan and Schedlowski, Manfred and Groettrup, Marcus and Elbert, Thomas and Kolassa, Iris-Tatjana (2013) Posttraumatic stress disorder is associated with an enhanced spontaneous production of pro-inflammatory cytokines by peripheral blood mononuclear cells. BMC Psychiatry, 13 (1): 40. ISSN 1471-244X

Martin, Roland and Kolassa, Stephan (2013) Forecasting to Meet Demand. Foresight: The International Journal of Applied Forecasting (28). pp. 5-11. ISSN 1555-9068

Januschowski, Tim and Kolassa, Stephan and Lorenz, Martin and Schwarz, Christian (2013) Forecasting with In-Memory Technology. Foresight: The International Journal of Applied Forecasting (31). pp. 14-20. ISSN 1555-9068

Schlee, Winfried and Leirer, Vera Maria and Kolassa, Stephan and Thurm, Franka and Elbert, Thomas and Kolassa, Iris- Tatjana (2012) Development of Large-Scale Functional Networks over the Lifespan. Neurobiology of Aging, 33 (10). pp. 2411-2421. ISSN 0197-4580

Kolassa, Stephan (2012) Two Notable New Forecasting Texts. Foresight: The International Journal of Applied Forecasting (27). pp. 40-45. ISSN 1555-9068

Gola, Hannah and Engler, Harald and Schauer, Maggie and Adenauer, Hannah and Riether, Carsten and Kolassa, Stephan and Elbert, Thomas and Kolassa, Iris-Tatjana (2012) Victims of rape show increased cortisol responses to trauma reminders : A study in individuals with war- and torture-related PTSD. Psychoneuroendocrinology, 37 (2). pp. 213-220. ISSN 0306-4530

Thurm, Franka and Scharpf, Andrea and Liebermann, Nadine and Kolassa, Stephan and Elbert, Thomas and Luchtenberg, Dietmar and Woll, Alexander and Kolassa, Iris- Tatjana (2011) Improvement of cognitive function after physical movement training in institutionalized very frail older adults with dementia. GeroPsych: The Journal of Gerontopsychology and Geriatric Psychiatry, 24 (4). pp. 197-208.

Kolassa, Stephan (2011) Combining exponential smoothing forecasts using Akaike weights. International Journal of Forecasting, 27 (2). pp. 238-251. ISSN 0169-2070

Kolassa, Stephan (2011) The Business Forecasting Deal. International Journal of Forecasting, 27 (2). pp. 631-633. ISSN 0169-2070

Leirer, Vera Maria and Wienbruch, Christian and Kolassa, Stephan and Schlee, Wilfried and Elbert, Thomas and Kolassa, Iris-Tatjana (2011) Changes in cortical slow wave activity in healthy aging. Brain imaging and behavior, 5 (3). 222–228. ISSN 1931-7557

Kolassa, Stephan and Martin, Roland (2011) Percentage Errors Can Ruin Your Day (and Rolling the Dice Shows How). Foresight: The International Journal of Applied Forecasting (23). pp. 21-27. ISSN 1555-9068

Kolassa, Iris- Tatjana and Ertl, Verena and Eckart, Cindy and Glockner, Franka and Kolassa, Stephan and Papassotiropoulos, Andreas and De Quervain, D. and Elbert, Thomas (2010) Association study of trauma load and SLC6A4 promoter polymorphism in PTSD : evidence from survivors of the Rwandan genocide. Journal of Clinical Psychiatry, 71 (5). pp. 543-547. ISSN 0160-6689

Kolassa, Stephan and Hyndman, Rob J. (2010) Free Open-Source Forecasting Using R. Foresight: The International Journal of Applied Forecasting (17). pp. 19-23. ISSN 1555-9068

Leirer, Vera Maria and Wienbruch, Christian and Paul-Jordanov, Isabella and Kolassa, Stephan and Elbert, Thomas and Kolassa, Iris- Tatjana (2010) Hippocampal activity during the transverse patterning task declines with cognitive competence but not with age. BMC Neuroscience, 11: 113. ISSN 1471-2202

Kolassa, Iris- Tatjana and Kolassa, Stephan and Ertl, Verena and Papassotiropoulos, A. and De Quervain, D. (2010) The Risk of Posttraumatic Stress Disorder After Trauma Depends on Traumatic Load and the Catechol-O-Methyltransferase Val158Met Polymorphism. Biological Psychiatry, 67 (4). pp. 304-308. ISSN 0006-3223

Kolassa, Stephan and Ertl, Verena and Eckart, Cindy and Kolassa, Stephan and Onyut, L.P. and Elbert, T. (2010) Spontaneous remission from PTSD depends on the number of traumatic event types experienced. Psychological Trauma: Theory, Research, Practice, and Policy, 2 (3). pp. 169-174.

Kolassa, Stephan (2009) How to assess forecastability. Foresight: The International Journal of Applied Forecasting (13). pp. 41-45. ISSN 1555-9068

Kolassa, Iris- Tatjana and Kolassa, Stephan and Bergmann, Sandra and Lauche, Romy and Dilger, Stefan and Miltner, W.H.R. (2009) Interpretive bias in social phobia : An ERP study with morphed emotional schematic faces. Cognition and Emotion, 23 (1). pp. 69-95. ISSN 0269-9931

Eckart, Cindy and Engler, Harald and Riether, Carsten and Kolassa, Stephan and Elbert, Thomas and Kolassa, Iris- Tatjana (2009) No PTSD-related differences in diurnal cortisol profiles of genocide survivors. Psychoneuroendocrinology, 34 (4). pp. 523-531.

Kolassa, Stephan (2008) Can we obtain valid benchmarks from published surveys of forecast accuracy? Foresight: The International Journal of Applied Forecasting (11). pp. 6-25. ISSN 1555-9068

Kolassa, Stephan (2007) Advantages of the MAD/Mean ratio over the MAPE. Foresight, 2007 (6). pp. 40-43. ISSN 1463-6689

Kolassa, Iris- Tatjana and Kolassa, Stephan and Musial, F. and Miltner, W.H.R. (2007) Event-related potentials to schematic faces in social phobia. Cognition and Emotion, 21 (8). pp. 1721-1744. ISSN 0269-9931

Kolassa, Stephan (2007) Spider phobics more easily see a spider in morphed schematic pictures. Behavioral and Brain Functions, 2007 (3): 59. ISSN 1744-9081

Contribution in Book/Report/Proceedings

Januschowski, Tim and Kolassa, Stephan (2021) A Classification of Business Forecasting Problems. In: Business Forecasting : The Emerging Role of Artificial Intelligence and Machine Learning. Wiley, pp. 171-181. ISBN 9781119782476

Kolassa, Stephan (2021) Commentary : Big Data or Big Hype? In: Business Forecasting : The Emerging Role of Artificial Intelligence and Machine Learning. Wiley, pp. 148-149. ISBN 9781119782476

Kolassa, Stephan (2021) Forecasting the Future of Retail Forecasting. In: Business Forecasting : The Emerging Role of Artificial Intelligence and Machine Learning. Wiley, pp. 243-254. ISBN 9781119782476

Kolassa, Stephan and Siemsen, Enno (2021) Know Your Time Series. In: Business Forecasting : The Emerging Role of Artificial Intelligence and Machine Learning. Wiley, pp. 164-170. ISBN 9781119782476

Kolassa, Stephan (2021) Will Deep and Machine Learning Solve Our Forecasting Problems? In: Business Forecasting : The Emerging Role of Artificial Intelligence and Machine Learning. Wiley, pp. 65-71. ISBN 9781119782476

Kolassa, Stephan (2005) Two-Step Drawing From Urns. In: Operations Research Proceedings 2004 :. Operations Research Proceedings . Springer, pp. 313-318. ISBN 9783540242741

Monograph

Fildes, Robert Alan and Ma, Shaohui and Kolassa, Stephan (2018) Retail forecasting: research and practice. Working Paper. UNSPECIFIED, Lancaster.

Book/Report/Proceedings

Kolassa, Stephan and Rostami-Tabar, Bahman and Siemsen, Enno (2023) Demand Forecasting for Executives and Professionals. CRC Press. ISBN 9781032507736

Kolassa, Stephan (2004) Multi-Step Shortlisting by Imperfect Experts. 3-Hirn-Verlag, Jena. ISBN 3937583173