Eik o Fried Pr o fess o r o f Mental Health & Data Science

2026, Eiko Fried
CC-BY-4.0

Project

WARN-D

Building a personalized early warning system for depression.

Project website

WARN-D develops a personalized early warning system for depression. The project follows young adults over time and combines intensive longitudinal assessment, smartphones, smartwatches, theory, measurement, and statistical modeling to better understand when risk for depression increases and how such risk might eventually be detected in daily life.

The project is funded by a European Research Council Starting Grant.

Related Work

Publications

  1. 2025 | Article

    Assessing the Internal Consistency Reliability of Ecological Momentary Assessment Measures: Insights from the WARN-D Study

    Castro-Alvarez, S., Zhou, D. J., Bringmann, L. F., Tutunji, R., Proppert, R. K. K., Rieble, C., Fried, E. I., & Liu, S.

    Psychological Assessment, 37(11), 614-623

    DOI PDF

  2. 2025 | Article

    Associations between ecological momentary assessment and passive sensor data in a large student sample

    Siepe, B. S., Tutunji, R., Rieble, C., Proppert, R. K. K., & Fried, E. I.

    Journal of Psychopathology and Clinical Science, 134(8), 912–925

    DOI PDF

  3. 2025 | Article

    Optimizing the Frequency of Ecological Momentary Assessments Using Signal Processing

    Jamalabadi, H., Stocker, J. E., Koosha, T. A., Jansen, A., Ebner-Priemer, U., Rieble, C. L., Proppert, R. K. K., Tutunji, R., & Fried, E. I.

    Psychological Medicine, 55, e358

    DOI PDF

  4. 2024 | Software

    Introducing FRED: Software for Generating Feedback Reports for Ecological Momentary Assessment Data

    Rimpler, A., Siepe, B. S., Rieble, C. L., Proppert, R. K. K., & Fried, E. I.

    Administration and Policy in Mental Health and Mental Health Services Research, 51(4), 490–500

    DOI PDF

  5. 2023 | Article

    Building an early warning system for depression: Rationale, objectives, and methods of the WARN-D study

    Fried, E. I., Proppert, R. K. K., & Rieble, C. L.

    Clinical Psychology in Europe, 5(3), e10075

    SUPP DOI PDF

Blog posts

  1. 2026-01-07

    WARN-D machine learning competition is live

    If you share one single thing from our team in 2026—on social media or per email with your colleagues—please let it be this machine learning competition . It has taken more than...

    Read

  2. 2024-07-30

    Playing the alphabet factor game: the S factor for satisfaction

    I also wanted to make a name for myself in the competitive field of alphabet factoring in psychology. G factor. P factor. I factor . D factor . Aaaaall the factors. My recent list...

    Read

  3. 2022-01-13

    Creating basic psychometric summaries in R

    We just finished collecting the first cohort of the WARN-D study , our ambitious effort to create a personalized early warning system for depression. In the 90 minute self report...

    Read

  4. 2021-10-02

    Schmeasurement: DSM-5 symptom measure edition

    For our new WARN-D research project on building a personalized early warning system for depression, I recently looked into openly available, transdiagnostic, self-report mental...

    Read

Talks

  1. 2023

    Developing a personalized early warning system for depression

    Personalized Data-Guided Approaches to Depression Care, Technology in Psychiatry Summit

    Slides YouTube

  2. 2022

    WARN-D: building a personalized early warning system for depression

    Cutting-edge advances towards personalized mental health seminar series, Stanford Center for Precision Mental Health and Wellness

    YouTube

  3. 2021

    WARN-D research project

    Trailer for our project to build a personalized early warning system for depression

    YouTube

  4. 2021

    1 minute science-communication challenge with legos

    YouTube

Media and resources

  1. 2026 | Research coverage

    Can a Wearable Make You Happier?

    GQ Magazine

    Unpaywall Read

  2. 2026 | Research coverage

    Your Smartwatch Actually Has No Idea How 'Stressed' You Are

    Lifehacker

    Read

  3. 2025 | Research coverage

    New Study Finds Smartwatches Aren't That Good at Measuring Stress

    Gizmodo

    Read

  4. 2025 | Research coverage

    Smartwatch Stress Scores Rarely Match Reality, Researchers Say

    Athletech News

    Read

  5. 2025 | Research coverage

    Smartwatches are useless for measuring actual stress levels, study says

    TechSpot

    Read

  6. 2025 | Research coverage

    Smartwatches offer little insight into stress levels, researchers find

    The Guardian

    Unpaywall Read

  7. 2025 | Interview

    Transdisciplinary work is fantastic

    Leiden University

    Read

  8. 2023 | Podcast

    Can Artificial Intelligence & Machine Learning Predict Depression?

    Chain of Thought

    Listen Read

  9. 2023 | Research coverage

    Onderzoeker ontwikkelt 'buienradar voor depressie' en vraagt student mee te helpen

    Researcher develops a 'rain radar for depression' and asks students to help

    UKrant

    Read

  10. 2022 | Research coverage

    Defeating depression through early risk detection and targeted medication

    Horizon Magazine

    Read

  11. 2022 | Research coverage

    Een buienradar voor depressies: deze wetenschapper probeert te voorspellen wie wanneer depressief wordt

    A rain radar for depression: this scientist is trying to predict who becomes depressed and when

    de Volkskrant

    Unpaywall Read

  12. 2022 | Research coverage

    Een buienradar voor depressies? Psychologen ontwikkelen app die je gemoed trackt

    A rain radar for depression? Psychologists develop an app that tracks your mood

    LINDA.nl

    Read

  13. 2022 | Research coverage

    Nederlander ontwikkelt buienradar voor depressies: 'De app kan mentale klachten voorspellen'

    Dutch researcher develops a rain radar for depression: 'The app can predict mental health problems'

    De Morgen

    Read

  14. 2022 | Research coverage

    Psycholoog Eiko Fried maakt een buienradar voor depressies

    Psychologist Eiko Fried is creating a rain radar for depression

    MARE

    Read

  15. 2022 | Research coverage

    WARN-D coverage in Leidsch Dagblad

    Leidsch Dagblad

    PDF