Tessera
Folgen

Manne Gerell

@mannegerell.bsky.social

Associate Professor in Criminology & co-founder Centre for policing & prevention, Malmö Uni, Sweden. Research on police, the geography of crime & fear, & crime prevention.

1552 Posts2758 Follower1203 Folgt
Christian Walburg @christianwalburg.bsky.social · last mo.

Cool! As only some German states (e.g. Berlin, Bavaria) have winter school holiday, one might take a look at this here as well... also interesting to see the effects in summer (assaults partly relocated to places like outdoor pools...?)

Manne Gerell@mannegerell.bsky.social · last mo.

New paper✅ In work led by Niklas Jakobsson we show that the winter school holiday in Sweden ("sports break") causes a reduction in assaults. This is driven by reductions against school age children (7-14y -46%, 15-17y -32%), with little effect on younger or older. link.springer.com/article/10.1...

School Breaks and Crime: Quasi-Experimental Evidence from Sweden - Journal of Quantitative Criminology

Objectives: We estimate the causal effect of school holidays on crime by exploiting the staggered timing of the Swedish winter sports break (sportlov) across municipalities. Methods: We use a differen...

link.springer.com

Manne Gerell@mannegerell.bsky.social · last mo.

Exciting/nervous now. My flight to Frankfurt was first delayed 20 minutes. Then 80. Now back down to 40. With 80 minutes I would almost certainly miss my connection to Johannesburg and then the connection to Hoedspruit where the ECCA conference is this year. 40 minutes delay might work..

Bild
Manne Gerell@mannegerell.bsky.social · 2mo ago

New paper with Niklas Jakobsson ✅ Did the 2024 Eurovision final in Malmö affect crime? We find that non-police initiated crime went down during Eurovision week - but this was counteracted by increases in adjacent weeks - so displacement rather than reduction. www.scup.com/eprint/7IZQE...

Did the Eurovision Song Contest in 2024 Affect Reported Crimes in the Hosting City?

We examine whether hosting the 2024 Eurovision Song Contest affected reported crime in Malmö, Sweden. Eurovision generated large visitor inflows and a substantial police reinforcement, creating a uniq...

scup.com

Manne Gerell@mannegerell.bsky.social · 2mo ago

I just took a look at the summary of my publications - and the 42 papers of mine that have gotten accepted for publication are spread out across 23 different journals. About as many are in journals I only published in once (14) as journals I published in two or three times (16) and more (12).

Manne Gerell@mannegerell.bsky.social · 2mo ago

New paper out✅ In work led by Mia Puur we do Risk Terrain Modeling of 32 Swedish cities and show that city characteristics matter a little for model performance - whereas methodoligical choices matter much more. link.springer.com/article/10.1...

Scaling Risk: Evaluating the Impact of Spatial Resolution on RTM Predictive Performance in 32 Swedish Urban Areas - Applied Spatial Analysis and Policy

This study systematically examines how spatial resolution, operationalized as grid cell size, influences the predictive performance of Risk Terrain Modeling (RTM) across 32 Swedish urban areas with va...

link.springer.com

Manne Gerell@mannegerell.bsky.social · 3mo ago

Yesterday the students who volunteer to do systematic social observations of hotspots presented their work on a poster. They are observing policing, crime and disorder to enable analysis on what it looks like and how it is related- a bit of replication on Koper 1995

BildBildBildBild
Manne Gerell@mannegerell.bsky.social · 3mo ago

New paper out in Methodological Innovations with Nicklas Guldåker and Karl Kronkvist. We study places perceived as unsafe, and note that a lack of data is hampering research on the topic. To advance the question we test and compare to data collection methods journals.sagepub.com/doi/10.1177/...

Sage Journals: Discover world-class research

Subscription and open access journals from Sage, the world's leading independent academic publisher.

journals.sagepub.com

C🅰️S Ⓜ️UDDE@casmudde.bsky.social · 3mo ago

Same here! Since Trump’s return, I have had almost no interview requests from US media but also almost no lecture invitations from US NGOs or universities (!). Invitations for academic and public speaking from the rest of the world are the same level if not higher.

Thomas Zeitzoff@zeitzoff.bsky.social · 3mo ago

It’s an anecdote, but it’s revealing. Since 2024 I’ve done 3-4x more interviews with foreign newspapers & media than US media. Most of them are trying to understand what’s happening in the US. Pre-2024, it was the opposite. It says something about the lack of introspection among US political media.

Jeff Asher@jeffasher.bsky.social · 4mo ago

New York City, Washington DC and Philadelphia all are reporting the fewest murders through Q1 ever recorded (note that NYC's data is only through March 29 but the city should easily set a new low). Detroit reported the fewest murders recorded there through March since 1964.

Detroit, NYC, DC and Philly murders through March per year since 1960
Manne Gerell@mannegerell.bsky.social · 4mo ago

🎉🎈🍾Very good news - today our consortium led by Lund University were awarded a "Strategic research area" for practice oriented research on crime. A strategic research area is a large, semi-permanent, addition to research funds. We will receive SEK 25 million per year from 2028.

Jack Werner@kwasbeb.bsky.social · 5mo ago

nu i höstas hände det här mig med. på torsdagsförmiddagen skrev jag en tweet om Jessika Stegrud. på fredagsmorgonen ringde soc min fru. två anmälningar hade kommit in en timme efter att jag publicerat min tweet, och i dem påstods det att jag hade slagit mitt barn på tunnelbanan.

Mathias Wåg@guldfiske.bsky.social · 5mo ago

Extremhögern kring Christian Peterson har vapeniserat orosanmälningar. Precis som de gjort med förtalsanmälningar. www.expressen.se/kultur/anna-...

Per Engzell@pengzell.bsky.social · 5mo ago

It's fascinating to me that Sweden, once global pariah for flouting lockdown consensus, seems to have come out better than even its Scandinavian neighbours

Jenn Dowd@drjenndowd.bsky.social · 5mo ago

3/ We show that this assumption is premature. Extending life expectancy estimates through 2024 for 34 high-income countries, we find that five years after the pandemic’s onset, 31 countries remain below their expected trajectories as projected by Lee-Carter forecasts.

Katharine Hayhoe@katharinehayhoe.com · 6mo ago

Bluesky is the new science Twitter, new study by @whysharksmatter.bsky.social and Julia Wester concludes! "Results show that for every reported professional benefit that scientists once gained from Twitter, scientists can now gain that benefit more effectively on Bluesky than on Twitter."

Scientists no Longer Find Twitter Professionally Useful, and have Switched to Bluesky

Synopsis. Social media has become widely used by the scientific community for a variety of professional uses, including networking and public outreach. For

academic.oup.com

Manne Gerell@mannegerell.bsky.social · 6mo ago

Emelie Stiernströmer has a scoping review of facial recognition technology in law enforcement out now. It is a small but growing field, 11 studies but the oldest from 2020. Most studies are on attitudes, and more research on its use and impact needed. www.tandfonline.com/doi/full/10....

Facial recognition technology in law enforcement- a scoping review of existing empirical studies

This scoping review maps empirical research on law enforcement’s use of facial recognition technology (FRT) for identification purposes. A systematic search of five databases, with no time restrict...

tandfonline.com

Ryan Briggs@ryancbriggs.net · 6mo ago

Overall, I think our results are: 1. Believable. I think deep down we all know we publish "too many" significant results. 2. Disastrous. Selecting on significance in this way biases results across our whole literature away from zero & it stops us from learning what doesn't work.

Ryan Briggs@ryancbriggs.net · 6mo ago

I have a new paper. We look at ~all stats articles in political science post-2010 & show that 94% have abstracts that claim to reject a null. Only 2% present only null results. This is hard to explain unless the research process has a filter that only lets rejections through.

It must be very hard to publish null results Publication practices in the social sciences act as a filter that favors statistically significant results over null findings. While the problem of selection on significance (SoS) is well-known in theory, it has been difficult to measure its scope empirically, and it has been challenging to determine how selection varies across contexts. In this article, we use large language models to extract granular and validated data on about 100,000 articles published in over 150 political science journals from 2010 to 2024. We show that fewer than 2% of articles that rely on statistical methods report null-only findings in their abstracts, while over 90% of papers highlight significant results. To put these findings in perspective, we develop and calibrate a simple model of publication bias. Across a range of plausible assumptions, we find that statistically significant results are estimated to be one to two orders of magnitude more likely to enter the published record than null results. Leveraging metadata extracted from individual articles, we show that the pattern of strong SoS holds across subfields, journals, methods, and time periods. However, a few factors such as pre-registration and randomized experiments correlate with greater acceptance of null results. We conclude by discussing implications for the field and the potential of our new dataset for investigating other questions about political science.
Veli-Matti Karhulahti@mkarhulahti.bsky.social · 6mo ago

First post of the year, new paper out today: we present possibly the biggest case of systematic Measurement Schmeasurement in tech use. It seems that most studies on gaming (videogame) addiction/disorder haven't measured gaming after all. This research took years, so long 🧵 doi.org/10.1098/rsos...

Confusion in gaming disorder measurement

Abstract. Measurement is important for the scientific programmes of addictive behaviours. In the present study, we investigated the measurement of gaming d

doi.org