Rafael H. M. Pereira 🚡 Urban Demographics

The Venn diagram of urban density and average household GHG emissions is pretty much a circle. Interesting study on “Mapping household GHG emissions in the Greater Golden Horseshoe” from the University of Toronto School of Cities schoolofcities.utoronto.ca/mapping-hous...

I’m grateful to be included in the list again this year. More importantly, I feel humbled to be in the company of so many scholars whose work I deeply admire and who have influenced my own thinking.

Academic rankings are all a bit arbitrary, and we all tend to highlight the ones where we look good. With that caveat in mind, Elsevier/Stanford has published the the 2% most cited researchers in 2024
Data: elsevier.digitalcommonsdata.com/datasets/btc...
Quick search tool: topresearcherslist.com

{gtfs2emis} - Estimate public transport emissions from GTFS data: ipeagit.github.io/gtfs2emis/

#RStats bookmark from the old twitter

The new TOC from academia dot edu. By creating an Account with Academia.edu, you grant us a worldwide, irrevocable, non-exclusive, transferable license, permission, and consent for Academia.edu to use your Member Content and your personal information (including, but not limited to, your name, voice, signature, photograph, likeness, city, institutional affiliations, citations, mentions, publications, and areas of interest) in any manner, including for the purpose of advertising, selling, or soliciting the use or purchase of Academia.edu's Services.

If you’re on academia dot edu, let me suggest that you strongly consider deleting your account.

It's that time of the year again and I am chuffed to be included in Elsevier list of the top 2% of most-cited authors for the year 2024 (at rank 51 within the field "Logistics and Transportation") as well for the whole career (rank 326) lnkd.in/e6QprVQh

The Incerto books are written in a provocative style that may not appeal to everyone. Beneath the prose, each book explores a profound concept in probability theory. I tried to strip each to its bare bones. (1/6)

A map of central Helsinki. A transparent overlay shows a grid of cells that are coloured according to the time needed to travel to their centre point from the railway station

Computing travel time matrices in r⁵py from #geopandas #DataFrame is two lines of code:

(1) create an r5py.TransportNetwork from @openstreetmap.bsky.social and #GTFS data

(2) turn it into an r5py.TravelTimeMatrix()

Try it out in #binder: r5py.readthedocs.io/stable/user-...

"The probability of first birth within marriage has become increasingly similar across social classes, while cohabiting and single parenthood have become more strongly stratified," finds
@aledinal.bsky.social in new DR article

A line chart showing that 38% of webpages from 2013 were no longer accessible one decade later.

LINK ROT: 38% webpages that existed in 2013 were no longer available 10 years later.

Even among pages that existed in 2021, 22% no longer accessible just two years later. This is often because individual page was deleted or removed on otherwise functional website.

Many implications for knowledge 🧪

NEW: The first evidence of a solar take-off in Africa☀️✈️

x33 rise in Algeria solar panel imports in the 12 mths to June 2025, compared to previous 12 mths.
x8 in Zambia
x7 in Botswana
x6 in Sudan
x3 in each of Liberia, DRC, Benin, Angola, Ethiopia

🧵

ICYMI: Safety as Access https://transportist.org/2025/09/12/safety-as-access/?utm_source=dlvr.it&utm_medium=mastodon

Bolsonaro Convicted of Attempting a Coup in Brazil, Sentenced to 27 Years in Prison Brazil’s Supreme Court convicted the former president of trying to cling to power after losing the 2022 election, including a plan to assassinate his opponent.

Jair Bolsonaro was sentenced to more than 27 years in a Brazil prison for attempting a coup after losing the 2022 election.

Safety as Access This paper shows how crash risk cuts lifecycle accessibility, integrates safety into access metrics, monetises gains with hedonic prices, and supports access-based appraisal.

Safety as Access

fixest: Fast Fixed-Effects Estimations Fast and user-friendly estimation of econometric models with multiple fixed-effects. Includes ordinary least squares (OLS), generalized linear models (GLM) and the negative binomial. The core of the p...

#rstats #econsky

fixest v0.13.0 is finally out!

It's still about making OLS and GLM estimations easy.

Some major changes:
- *default* VCOV becomes iid always!
- singletons are removed by default!

See all the changes here:
github.com/lrberge/fixe...

A quick reminder that the #SDSS2025 deadline for Thematic Session proposals is coming up quickly. We'd love to see a proposal from you on a topic of your choice. The symposium is free, online, and typically has large numbers of engaged attendees.
sdss2025.spatial-data-science.net

- Paper (open access): doi.org/10.1016/j.ci...

- Data (open access): the full data set of the survey results is available here dataverse.harvard.edu/dataset.xhtm...

2. Despite context and cultural differences across countries, there is also a consensus that the “adequate distance” to activities related to basic needs and caregiving is consistently shorter, even though the “reasonable access time” varies significantly across activities.

1. There is a seemingly universal understanding of “proximity” (up to 1600 m), with small variations depending on city size and country.

New paper alert! In a massive collaborative effort, we surveyed 1300 transport & planning practitioners from 22 countries to ask their understanding and normative views of proximity-centred accessibility. doi.org/10.1016/j.ci... To me, the most amazing results that emerged from this paper are that:

A generation of researchers will vanish, as intended, due to the US Administration’s illegal politicized attacks on our universities. Our national capacity for innovation and competitiveness, hobbled.

We usually rely on GDP, trade, or wages to study the past. This amazing paper flips the script.

It analyzes 630,000 paintings (1400-2000) to extract emotions and shows how art tracks living standards, wars, inequality, and even climate shocks.

(How is this economics? Everything is economics!)

#Accessibility modelers using #r5r #rstats, check this GUI for playing around with R5 network. If many people find it useful, I would get signal if I should invest any more free time into it. github.com/e-kotov/r5rgui (uses #mapgl by @kylewalker.bsky.social and #r5r by @urbandemog.bsky.social et al)

WE ARE HIRING! 2 Lecturers in Quantitative Social Science. Want a friendly interdisciplinary department in one of the world's most vibrant cities? This just might be for you.

Apply by: 10 Oct

www.ucl.ac.uk/work-at-ucl/...

The paper was led by @yuanliao.bsky.social, in collaboration with a wonderful team including @jorgealgil.bsky.social , @sonia-yeh.bsky.social and Laura Alessandretti

New study using 📱geolocation data to examine the impact of major transit fare subsidies in Germany (Deutschlandticket - DT). Using a time-shifted DiD model, we assessed how DT affected travel behavior in terms of visitation volumes and trips distances across the country doi.org/10.1016/j.tr...

In 2008 I met a climate scientist from Mali who was advocating for this so long that he looked exhausted. Absolutely amazing man. He was working so hard on this. And then I see numbers like this and my heart just soars. Youba Sokona, you (and your peers) really did it.

www.ipcc.ch/people/youba...

📣help: can anyone point to a tutorial or example on how to do spatial operations in #Rstats using #duckdb ?
Cc @ekotov.pro @paleolimbot.bsky.social @robinlovelace.bsky.social