Summary of my academic 2018
Following up on last year’s summary of 2017, I wanted to write up the highlights of my academic 2018: publications, collaborations, achievements and failures, open science, blogging, and some thoughts… Read more »
Category Archives: My work
Failure of the week
In our Clinical Psychology group in Leiden, we have the tradition to share new papers, accepted grant proposal, and other achievements in emails called “Paper of the Week”, “Grant of… Read more »
10,377 ways for major depression, but 341,737 ways for melancholia
Summary: There are up to 10,377 ways to qualify for a diagnosis of major depression, but there up to 341,737 ways to qualify for a diagnosis of melancholia, which is… Read more »
Assistant professor, APS rising star, and some papers
Three brief personal updates. After living in 6 countries in the last 12 years; after affairs and short relationships with Ludwig Maximilian’s University Munich, Free University Berlin, University of Michigan,… Read more »
New paper: “What are psychological constructs?”
One of the fundamental shortcomings of the empirical psychological literature on mental disorders, personality aspects, intelligence, or emotions is that there is a lack of depth regarding the discussion what… Read more »
New paper on stability and accuracy of psychological networks
Our paper “Estimating psychological networks and their accuracy: a tutorial paper” was published in Behavioral Research Methods as open access paper! You can find the full paper here, and the… Read more »
New paper: the 52 symptoms of major depression
I published a new paper in the Journal of Affective Disorders entitled “The 52 symptoms of major depression: Lack of content overlap among seven common depression scales” (PDF). The paper… Read more »
New paper on responsiveness of depression rating scales
After reviewing the paper “The relative responsiveness of test instruments can be estimated using a meta-analytic approach: an illustration with treatments for depression” by Kounali et al. 2016, the editor… Read more »
New commentary on problems with latent class analysis in depression research
We have a new commentary in Molecular Psychiatry entitled “Problems with latent class analysis to detect data-driven subtypes of depression” (PDF; together with the fantastic Hanna van Loo, Rob Wanders… Read more »
New network paper on comorbidity between mood and anxiety disorders
We have a new network paper out in Psychological Medicine entitled “Network Analysis of Depression and Anxiety Symptom Relations in a Psychiatric Sample” (PDF). I tend to think of the… Read more »
Common depression scales are neither unidimensional nor measurement invariant
We published a new study in Psychological Assessment a few days ago, and I would like to take the time to explain what these results imply. You can find the… Read more »
Molecular Psychiatry commentary: Fried & Kievit 2015
On December 15th, Molecular Psychiatry published our commentary “The volumes of subcortical regions in depressed and healthy individuals are strikingly similar: a reinterpretation of the results by Schmaal et al”…. Read more »
New overview article in The Psychologist
The folks at The Psychologist were kind enough to publish a short overview piece that summarizes the current problems we are facing in depression research, the problematic assumptions the research… Read more »
New network study: What are good depression symptoms?
Our new paper “What are ‘good’ depression symptoms? Comparing the centrality of DSM and non-DSM symptoms of depression in a network analysis” was published in the Journal of Affective Disorders… Read more »
Blog about our STAR*D depression heterogeneity paper
John McManamy has written a great piece on depression heterogeneity at healthcentral.com that nicely sums up our study “Depression is not a consistent syndrome: an investigation of unique symptom patterns… Read more »