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In the previous posts, I discussed the historical roots of cross-validation and the methodological decisions involved in implementing it. In this final post, I turn to how cross-validation is actually used in contemporary psychological research. I will consider two examples that reflect different levels at which cross-validation operates: 1) as a technical resampling procedure used to analyse a single dataset, 2) as a broader research strategy aimed at testing generalizabilit

Many people have written about this. I will add my voice as well. About how the current model of publication activity and peer review in academia has gone in the wrong direction and, in many ways, discredited itself. What do we have now? 1.     The scientific value of a researcher is defined by the number of published papers and the number of citations. This leads to an increase in the number of articles and to inflation of the value of a single paper. Researchers often wr

In the previous post, I discussed the historical roots of cross-validation. In this post, I turn to how the method is currently discussed in psychological research. Two recent papers approach the problem of cross-validation from different angles. The first is “Cross-validation: A Method Every Psychologist Should Know”  (De Rooij & Weeda, 2020). This article provides a practical framework for implementing cross-validation in psychological research, especially in the context of

Two meanings of “cross-validation” The term cross-validation is used in psychology in at least two related but not identical senses. Historically, these meanings were closely connected, but in contemporary research they often refer to different methodological practices. In much of psychological and clinical research, cross-validation traditionally refers to validation on an independent sample . In this sense, a model or classification scheme is estimated in one dataset and t

I continue to move some of the posts I especially liked from my Telegram channel to my blog. This time, it is a post about gender inequality in science. I originally wrote it in 2024; now I have slightly updated it and added the results of two new studies published in 2025. In general, I am rather cautious about the topic of gender inequality, because it is very often exploited and discussed excessively, sometimes with distorted facts, and it is not always clear where there i

At the end of the year, one usually wants to write something reflective and positive. This time, however, I decided to write about something that has been bothering me for a while 😊 As I mentioned before, one of my papers has been under review for more than a year. I submitted it to a journal in September 2024, and it was sent out for review. And then…nothing. For a long time, the submission system simply displayed a note saying that the review deadline had passed. No furthe

Today many researchers publish their papers in Open Access (OA) journals. Sometimes they do this because publishing there is faster and more convenient than in subscription-based journals. Sometimes because they want their paper to reach as many readers as possible and, as a result, get more citations. This raises a question: how reasonable is this strategy? Are papers published in OA journals really cited more often? And is it really easier and faster to publish there? It tu

I have my own Telegram channel where I write about scientists and science in Russian, and I want to start translating some of those posts that still seem relevant. Together with a colleague, I also run another Telegram channel, formerly Cognitive Psychometrics  and now Psychometrics and Psychoskepticism . Every couple of weeks I write short posts there—usually summaries of recent papers. I’ll translate some of those as well, since there is material worth sharing. For today I’

Lately, I’ve noticed that I start writing something and then stop, thinking, “Who needs this?” or “No one will read it anyway.” Everyone writes, and there’s already more written in the world than anyone could ever read. But today I suddenly realized that by thinking this way, I’m silencing myself. I’m the one taking away my own voice. It’s like that old Russian saying, “Stay quiet - people will think you’re smart.” And then there’s that familiar feeling that nothing makes a

In my previous post, I wrote about what students in different countries think about their future education and career. This time, I looked more closely at differences between native and immigrant students and how these differences might reflect a broader idea often called immigrant optimism . This concept usually refers to the tendency of immigrant families to hold higher educational and career aspirations than natives, even when their socioeconomic background is less favorab

The topic of career choice has interested me for a long time, perhaps because the process was not an easy one for me personally. Or...

Psychologist or scientist? Ever since I started working at the Institute of Education and doing research in education, and later in...

I spent the past few days at the ECER (European Conference on Educational Research) . I was lucky this year—it was held in Belgrade. I...

Years ago, when I was still an early-career researcher, my colleagues and I were working with PISA 2006 and 2009 data. As you know, the...

Two weeks ago, I submitted a paper on the native–immigrant educational gap in the Balkans, prepared as part of a research grant supported...

Today’s post belongs to the “unfinished article (or written-but-never-to-be-published)” category. I believe every researcher has a secret...

In contemporary psychology, it's almost a cliché to speak of two major research traditions: the experimental  and the correlational . But...

Reflections after a performance in Belgrade Yesterday, I attended a touring theatre production of The Suitcase  based on Dovlatov’s work,...

As I mentioned earlier, I received a small research grant to investigate the achievement and well-being gap between native and immigrant...

From Course to Book When I lived in Russia and worked at the Institute of Education at the Higher School of Economics, I did a...