Koen Neijenhuijs
PhD

Data Scientist

If I were to describe myself in two words it would be "Data Nerd". Once I realized I enjoyed using and explaining a large variety of statistical techniques, I realized I wanted to work with data on a daily basis. I enrolled into one of the Top Research Master Programmes in Behavioural Science, which I finished Cum Laude. Next I finished my PhD dissertation focussed on psychometrics and big data in eHealth (defense pending). Currently, I am working as a Data Science Consultant at Ordina. I am looking forward to a long career where I can (responsibly) play around with data on a daily basis.

Work Experience

Data Scientist

Mar 2021 - Present
HumanTotalCare, Utrecht area
Mar 2021 - Present

As a Data Scientist at the Research & Development department of HumanTotalCare I create data-driven applications to help our occupational health experts provide the best prevention and care programs for our customers.

Data Science Consultant

Jan 2020 - Feb 2021
Ordina, Utrecht area
Jan 2020 - Feb 2021

As a Data Science Consultant I have been involved in an internal project where I was responsible for a business case and textmining. I have provided a Data Science curriculum for GO Opleidingen, an institute that provides training for information professionals, and was deployed as a Senior Data-Analyst at Achmea, one of the largest insurance companies in the Netherlands.

Data Scientist (Doctoral)

Aug 2015 - aug 2019
VU, Amsterdam
Aug 2015 - Present

As a Doctoral Data Scientist at the department of Clinical Psychology at VU Amsterdam, I investigated the usage of Patient Reported Measures in eHealth, particularly focused on the field of psychosocial oncology. I have investigated the psychometric properties of 29 PROMs through a systematic review, validated the Dutch version of the eHealth Impact Questionnaire, and have used a machine learning algorithm to extract extract symptom clusters based on the PROM responses collected by Oncokompas 2.0.

My full dissertation can be accessed by clicking here.

Due to my focus and expertise on data-analysis, I have provided statistical support to both internal projects as well as to various research projects of War Child.

Statistical Consultant

Mar 2014 - Jul 2015
Radboud University, Nijmegen
Mar 2014 - Jul 2015

I provided statistical and methodological support to Bachelor and Master students.

Teaching Assistant (Bachelor Psychology)

Sep 2012 - Jul 2015
Radboud University, Nijmegen
Sep 2012 - Jul 2015

I taught practical classes for university-level Bachelor courses (i.e. Methods of Research (B1), Statistics 2 (B2), Psychometric and Decision Analysis (B2), and Data-analysis (B2).

Analyzing data is my pride and joy. Very little is more fulfilling than finding the right analysis for the right data set, to answer a research question. I am a large proponent of using correct analytical methods. As such, I try to keep up with state-of-the-art analysis techniques that are best suited to answer questions I am working on. I have collected quite some proficiencies in a range of analytical methods. I try to advocate proper methodology and data-analysis by being available to colleagues to discuss and advice on these matters.

Skills

  • R
    Expert
  • Analysis of Variance
    Expert
  • Regression
    Expert
  • Machine Learning
    Expert
  • Psychometric Analysis
    Expert
  • Mixed-effect Models
    Expert
  • MySQL
    Proficient
  • Simulation Studies
    Proficient
  • Python
    Proficient
  • Bayesian Statistics
    Competent

My academic career started during my Research Master: Behavioural Science where I specialized in Behavioural Science and advanced data-analysis. In particular, I specialized in Behavioural Risky Decision-Making. As a PhD student I focused on measurement properties of Patient Reported Measures used in eHealth, paritcularly focused on the field of socio-oncology. Furthermore, I investigated the opportunities of using Machine Learning and Data Mining to delve into large datasets of Patient Reported Measures. My full dissertation can be accessed by clicking here.

Publications

2020

Kragting, M., Voogt, L., Neijenhuijs, K.I., Pool-Goudzwaard, A.L., & Coppieters, M.W. (2020). Cross-cultural adaptation and validation of the Dutch language version of the Pictorial Fear of Activity Scale – Cervical. BMC Musculoskeletal Disorders, 21:708. doi:0.1186/s12891-020-03724-1

Brown, F.L., Fara, A.I., Hussein Abd Alla, F., Radford, K., Miller, L., Neijenhuijs, K.I., Stubbé, H., de Hoop, T., Abbadi, A.A., Turner, J.S., Jetten, A., & Jordans, M.J.D. (2020). Can’t Wait to Learn: A quasi-experimental mixed-methods evaluation of a digital game-based learning programme for out-of-school children in Sudan. Journal of Development Effectiveness. doi:10.1080/19439342.2020.1829000

2019

Neijenhuijs, K.I., van der Hout, A., Veldhuijzen, E., Scholten-Peeters, G. G. M., van Uden-Kraan, C. F., Cuijpers, P., & Verdonck-de Leeuw, I. M. (2019). Translation of the eHealth Impact Questionnaire for a Population of Dutch Electronic Health Users: Validation Study. Journal of medical Internet research, 21(8), e13408. doi:10.2196/13408

Neijenhuijs, K. I., Hooghiemstra, N., Holtmaat, K., Aaronson, N. K., Groenvold, M., Holzner, B., ... & Verdonck-de Leeuw, I. M. (2019). The Female Sexual Function Index (FSFI)—A Systematic Review of Measurement Properties. The Journal of Sexual Medicine, 16(5), 640-660. doi:10.1016/j.jsxm.2019.03.001

Neijenhuijs, K. I., Hooghiemstra, N., Holtmaat, K., Aaronson, N. K., Groenvold, M., Holzner, B., ... & Verdonck-de Leeuw, I. M. (2019). The Female Sexual Function Index (FSFI)—A Systematic Review of Measurement Properties. The Journal of Sexual Medicine, 16(5), 640-660. doi:10.1016/j.jsxm.2019.03.001

van der Hout, A., Neijenhuijs, K. I., Jansen, F., van Uden-Kraan, C. F., Aaronson, N. K., Groenvold, M., ... & Verdonck-de Leeuw, I. M. (2019). Measuring health-related quality of life in colorectal cancer patients: systematic review of measurement properties of the EORTC QLQ-CR29. Supportive Care in Cancer, 1-18. doi:10.1007/s00520-019-04764-7

Kooistra, K.C., Wiersma, J.E., Neijenhuijs, K.I., Lokkerbol, J., van Oppen, P., Smit, F., & Riper, H. Costs and effectiveness of blended versus standard cognitive behavioral therapy for depressed outpatients in routine specialized mental healthcare: a pilot randomized controlled trial. Journal of Medical Internet Research, 21(10), e14261. doi:10.2196/14261

2018

Neijenhuijs, K. I., Jansen, F., Aaronson, N. K., Brédart, A., Groenvold, M., Holzner, B., ... & Verdonck-de Leeuw, I. M. (2018). A systematic review of the measurement properties of the European Organisation for Research and Treatment of Cancer In-patient Satisfaction with Care Questionnaire, the EORTC IN-PATSAT32. Supportive Care in Cancer, 26(8), 2551-2560. doi:10.1007/s00520-018-4243-9

Melissant, H. C., Neijenhuijs, K. I., Jansen, F., Aaronson, N. K., Groenvold, M., Holzner, B., ... & Verdonck-de Leeuw, I. M. (2018). A systematic review of the measurement properties of the Body Image Scale (BIS) in cancer patients. Supportive Care in Cancer, 26(6), 1715-1726. doi:10.1007/s00520-018-4145-x

Klein, R. A., Vianello, M., Hasselman, F., Adams, B. G., Adams Jr, R. B., Alper, S., ... & Batra, R. (2018). Many Labs 2: Investigating variation in replicability across samples and settings. Advances in Methods and Practices in Psychological Science, 1(4), 443-490. doi:10.1177/2515245918810225

Provoost, S., Ruwaard, J., Neijenhuijs, K., Bosse, T., & Riper, H. (2018). Mood mirroring with an embodied virtual agent: A pilot study on the relationship between personalized visual feedback and adherence. In International Conference on Practical Applications of Agents and Multi-Agent Systems, 24-35. Springer, Cham. doi:10.1007/978-3-319-94779-2_3

Pre-2018

Anderson, C. J., Bahník, Š., Barnett-Cowan, M., Bosco, F. A., Chandler, J., Chartier, C. R., ... & Della Penna, N. (2016). Response to comment on “estimating the reproducibility of psychological science”. Science, 351(6277), 1037-1037. doi:10.1126/science.aad9163

Open Science Collaboration. (2015). Estimating the reproducibility of psychological science. Science, 349. doi:10.1126/science.aac4716

Sommers, R. P., Dings, R., Neijenhuijs, K. I., Andringa, H., Arts, S., van de Bult, D., ... & Haselager, P. F. (2015). A young scientists’ perspective on DBS: a plea for an international DBS organization. Neuroethics, 8(2), 187-190. doi:10.1007/s12152-015-9231-x

Grants

Grant Consumer eHealth

January 2017
NFU Citrien
January 2017

Grant awarded by the NFU funded by the Citrienfund, for translating and validating the eHealth Impact Question for the Dutch population of eHealth users (eHIQ-NL). For more information on this project, see here.

Areas of Expertise

  • Behavioural Science
    Expert
  • Advanced Data-analysis
    Expert
  • Measurement Properties
    Expert
  • Patient Reported Outcome Measures
    Expert
  • Risky Decision-making
    Knowledgeable
  • Psycho-oncology
    Intermediate

Am I a developer? Not really, but I enjoy coding! I started coding in Python to set up behavioural experiments, as well as coding in R for data-analyses. Because I enjoy this kind of coding, I delved back into HTML and CSS (which I hadn't touched since I was 15) to build this website. I'm looking to keep creating small coding projects in my free time.

Skills

  • Python
    Intermediate
  • HTML
    Intermediate
  • CSS
    Intermediate
  • Javascript
    Beginner

Education

Doctor of Philosophy,
Clinical Psychology: eHealth and Data Science

2015 - 2020
VU University, Amsterdam
2015 - 2020

For my doctoral research I researched the validity / reliability and usability of Patient Reported Measures (PRMs) used in eHealth, and the way in which we can use the data that is collected with them. The result was a dissertation consisting of six chapters and an intermezzo. My full dissertation is available here.

Master's Degree (Research),
Research: Behavioural Science, Cum Laude

2013 - 2015
Radboud University, Nijmegen
2013 - 2015

I completed the Research Master program Cum Laude. The program focused on the use of the scientific method in Behavioural Sciences. During my last year I specialized in Decision-Making research, in particular Risky Decision-Making in Adolescents. My masterthesis is available here.

Honours Academy Degree,
Beyond the Frontiers

2014 - 2015
Radboud University, Nijmegen
2014 - 2015

During my second year of the Research Master, I travelled to Glasgow University to visir dr. Dale Barr. In Glasgow I worked on the intricacies of writing R packages, programming simulation studies, and the mathematics behind Mixed-Effect Models.

Honours Academy Degree,
Wider Implications of Neuroscience

2013 - 2014
Radboud University, Nijmegen
2013 - 2014

During my first year of the Research Master, I collaberated with 7 other Master Students from differing disciplines. Tasked by the Health Council of the Netherlands, we delved into the specifics of the 'Wider Implications of Deep Brain Stimulation'. The end result was a report and publication in Neuroethics.

Bachelor's Degree,
Psychology

2008 - 2013
Radboud University, Nijmegen
2008 - 2013

I completed my Bachelor's Degree in Psychology. The Bachelor program focused on both the scientific discipline of Psychology, as its application in practice.

Hobbies

  • Video Games
    Beat FTL Once
  • Playing Drums
    Wannabe Rockstar
  • Playing Guitar
    Enthusiastic Amateur
  • Mixing and Mastering
    Enthusiastic Amateur

Languages

  • Dutch
    Native
  • English
    Fluent