Gregers Kristian Kjerulf
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gregerskjerulf.bsky.social
Gregers Kristian Kjerulf
@gregerskjerulf.bsky.social
150 followers 240 following 170 posts
#dataanalysis #rstats #dataviz
Senior Data Analyst, DTU Food
Views mine
www.gregdubrow.io
www.linkedin.com/in/dubrowg/
https://medium.com/the-polymaths-dilemma
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gregerskjerulf.bsky.social
As always for Halloween, I have two costumes.
On the left - data analyst
On the right - SEXY data analyst
October 31, 2025 at 8:12 PM
gregerskjerulf.bsky.social
Somebody at my graduate alma mater's fundraising office's IT team is going to be busy this weekend. 😳

These two plus a third one have all hit in the last 10 minutes or so.

Probably time to change my passwords in the alumni portal.
email from hacked donor relations system with the following text: Dear Penn community, The University of Pennsylvania is a dogshit elitist institution full of woke retards. We have terrible security practices and are completely unmeritocratic. We hire and admit morons because we love legacies, donors, and unqualified affirmative action admits. We love breaking federal laws like FERPA (all your data will be leaked) and Supreme Court rulings like SFFA. Please stop giving us money. Warm regards, The University of Pennsylvania email from hacked university donor relations system reading: Dear Penn community, The University of Pennsylvania is a dogshit elitist institution full of woke retards. We have terrible security practices and are completely unmeritocratic. We hire and admit morons because we love legacies, donors, and unqualified affirmative action admits. We love breaking federal laws like FERPA (all your data will be leaked) and Supreme Court rulings like SFFA. Please stop giving us money.
October 31, 2025 at 3:55 PM
gregerskjerulf.bsky.social
CatGPT thought my language was too verbose & inefficient, and chided me for using map_dfr() as it's been soft-deprecated.
Front-facing shot of a grey cat with yellow eyes on a human's lap, looking just below the camera lens.
October 10, 2025 at 10:43 AM
gregerskjerulf.bsky.social
CatGPT helping me debug a custom #rstats plotting function
Side shot of a grey cat sitting on a human's lap at a table. The human's left hand is on a computer keyboard. The cat is seemingly looking at a computer screen with code and a plot
October 10, 2025 at 10:43 AM
gregerskjerulf.bsky.social
Cheers to all who attended and contributed, and to Simone Pasolini for his excellent event management work. Thanks to the staff at Matrikel1 for setting us up in a room with a beautiful view of the canal and Christiansborg.
A view of the canal and parliament building in Copenhagen
September 18, 2025 at 9:09 PM
gregerskjerulf.bsky.social
A fun afternoon co-presenting the DDSA Data Science in Practice session on data visualization. We had a creative & engaged group who, barely knowing each other, worked in groups to produce insightful data viz on data they hadn't seen before today
Link to slides:
greg-dubrow.github.io/DDSA_DataViz...
Large television screen with slides for a data visualization talk. The screen faces the first row of chairs where the audience will sit a group of people work together on laptops to visualize data two people presenting the data visualization they created
September 18, 2025 at 9:09 PM
gregerskjerulf.bsky.social
New gig, new digs!

First day as Senior Data Analyst at DTU National Food Institute where I'll be helping researchers in nutrition & food science. It leverages my skills & experience in #rstats #dataviz and academic research.
photo of a desk with, from left to right, a laptop, moleskine notebook with a pen and small wooden bird on it, and two monitors.
September 1, 2025 at 4:10 PM
gregerskjerulf.bsky.social
What's the value of contributing to the #30DayChartChallenge ?

I took a moment for self-reflection to think about that & put it into a new post on the blog

www.gregdubrow.io/posts/lesson...

Thoughts on improving my #rstats & #dataviz skills, learning more about education in 🇩🇰 & lots more.. 1/
composite collage of 4 charts submitted to the 30 Day Chart Challenge
May 16, 2025 at 11:16 AM
gregerskjerulf.bsky.social
A bit late for my last #30DayChartChallenge some #rstats #dataviz for day 28's prompt - inclusion. Looking at the immigrant experience in the 🇩🇰 education system

tl/dr is more attainment beyond primary level & immigrants rely on vocational degs for social mobility

www.gregdubrow.io/posts/30-day...
waffle chart of educational attainment in Denmark by national origin in 2005, 2011, 2017 and 2023 Faceted bar charts of waffle chart of degree types earned in Denmark by national origin from 2005 to 2024
May 6, 2025 at 11:22 AM
gregerskjerulf.bsky.social
What is educ attainment by province in 🇩🇰? See this (late) post for #30DayChartChallenge prompt 18 El Pais *

#dataviz is maps plotting % by province **. I reused code from a 2024 post, w/ interactivity via g🦒 📦

#rstats data -> 🇩🇰s Statistik via danstat 📦
Full post www.gregdubrow.io/posts/30-day...
Plot of 9 maps of Denmark faceted by educational attainment level showing percent of that level by province.
April 27, 2025 at 10:23 AM
gregerskjerulf.bsky.social
The #30DayChartChallenge prompts 24 & 25, @who.int & risk

For no particular reason, looking at measles vax rates worldwide. #dataviz in #rstats using rgho 📦

More details in post, but messy data in early 2000s & not sold on design choice for Euro subregion plot

www.gregdubrow.io/posts/30-day...
Messy line plots showing measles vaccination rates by country within European subregions, 2000-2023
April 26, 2025 at 9:26 AM
gregerskjerulf.bsky.social
A #30DayChartChallenge prompt 23 log scales post turns into a post about gender pay gap in 🇩🇰

#dataviz #rstats via danstat 📦

Sadly pay gaps is common, even in countries like 🇩🇰 w/ wage equality laws & good unions.

Digging deeper by deg type, still a gap. More at:

www.gregdubrow.io/posts/30-day...
line graphs showing monthly income for men and women in denmark from 2015 to 2023. there is a gap in wages, with men earning more
April 25, 2025 at 10:33 AM
gregerskjerulf.bsky.social
Prompt 19 | #30DayChartChallenge | smooth
(yes, I did 20 yesterday & today should be prompt 23 🤷‍♂️)

It's time series #dataviz of bachelor degs in 🇩🇰, overall & by sex. #rstats using danstat 📦
Most interesting thing for me was tech science degs. Read more in the post:
www.gregdubrow.io/posts/30-day...
dotted line chart displaying degrees awarded by sex and major in the technical sciences discipline in denmark from 2005-2024
April 23, 2025 at 12:03 PM
gregerskjerulf.bsky.social
Prompt 20 | #30DayChartChallenge | urbanization

I wanted to see if more people were moving to larger urban areas & if they were more educated

The answers are yes & yes. More detail & #dataviz thoughts in the post

Data from 🇩🇰 Statistik via danstat 📦 for #rstats

www.gregdubrow.io/posts/30-day...
stacked bar chart displaying percent of people in Denmark by educational attainment and municipal group 2008-2023
April 22, 2025 at 1:25 PM
gregerskjerulf.bsky.social
My #30DayChartChallenge posts are no longer in order - here's prompt 13, clusters. It's R&D expenses by sector & field in 🇩🇰. The fun here was using the g🦒 #rstats 📦 to add tooltips to the #dataviz

Full post: www.gregdubrow.io/posts/30-day...

I likely won't get back on prompt schedule, but onward
scatterplot showing R&D expenses by sector and field as a percentage of all R&D expenses on the x axis and the percent change on the y axis.
April 21, 2025 at 10:59 AM
gregerskjerulf.bsky.social
For #30DayChartChallenge prompt 15, complicated, I expanded on 14 to look at higher ed completion by age & parent ed levels in 🇩🇰. Age didn't matter... ↗️ education your parents have, more likely you are to finish college

🧇 charts #dataviz in #rstats

Full post at:
www.gregdubrow.io/posts/30-day...
waffle charts displaying college completion status by age group and parent ed levels in Denmark in 2023
April 20, 2025 at 11:19 AM
gregerskjerulf.bsky.social
Was interrupted a bit, but back w/ a (late) #30DayChartChallenge post for Day 14: Kinship. For this #dataviz I did a #snakey plot to look at higher ed outcomes for people 25-45 depending on parent ed. As always in #rstats & data from Danmarks Statistik

Full post at www.gregdubrow.io/posts/30-day...
A sankey network plot showing relationship between parent educational attainment and higher education status of the child, for people in Denmark aged 25-45
April 18, 2025 at 1:01 PM
gregerskjerulf.bsky.social
Nugget explaining to me that I need to write an #rstats function and not cut-paste-amend the same code again and again
#catsofbluesky
A grey cat sits on a human's lap at a desk in front of a laptop. Her left paw is on the human's right arm as if to keep the human from typing something.
April 10, 2025 at 12:10 PM
gregerskjerulf.bsky.social
Are there differences in what types of Bachelor degrees are awarded to women v men in 🇩🇰?

For the #30DayChartChallenge prompts 5 & 9, Ranking & Diverging, I found differences to be more stark than expected.

#dataviz in #ggplot & #rstats using data from Danmarks Statistik via danstat 📦
1/...
Horizontal bar charts showing raw numbers of bachelor's degrees awarded by discipline and by sex in Denmark in 2023 Bar charts showing percentages by discipline and sex of bachelor's degrees awarded in Denmark in 2023
April 9, 2025 at 11:53 AM
gregerskjerulf.bsky.social
Which vocational secondary education degrees are the most popular in 🇩🇰?

To answer I combined #30DayChartChallenge prompts 7 & 8, outliers & histogram, into one post.

www.gregdubrow.io/posts/30-day...

#dataviz in #ggplot / #rstats w/ data from Danmarks Statistik via danstat 📦

1/...
Histogram showing distribution of secondary ed level vocational degrees awarded by field in Denmark 2024 Horizontal bar chart showing distribution of secondary ed level vocational degrees awarded by field in Denmark 2024. Bars arranged in descending numerical order, dgree names in labels to the left.
April 8, 2025 at 9:51 AM
gregerskjerulf.bsky.social
Florence Nightingale is prompt 6 #30DayChartChallenge so I took a look at vocational education for SOSU, or social- og sundhedsassistent, a nurse's assistant.

I was especially interested in who is earning the degrees.

www.gregdubrow.io/posts/30-day...

#dataviz #ggplot #rstats,
stacked bar chart sowing gender distribution of nursing assistant degrees in Denmark from 2019 to 2024
April 6, 2025 at 6:21 PM
gregerskjerulf.bsky.social
2025 #30DayChartChallenge - prompt 5 is ranking

A deep dive Bachelor's degrees awarded by discipline, major & sex. Some (surprising?) diffs betw men & women in terms of degree choices. As always #dataviz in #ggplot / #rstats

Lots of charts! See for yourself at
www.gregdubrow.io/posts/30-day...
Horizontal bar charts showing bachelors degrees awarded in Denmark by discipline and sex in 2023
April 5, 2025 at 12:40 PM
gregerskjerulf.bsky.social
It's #30DayChartChallenge day 4, prompt = Big or Small.

Today a packed circle graph showing 4-year Bachelor's degs awarded in 🇩🇰 in 2023 by discipline. Most popular was Social Sciences.

Data from Danmarks Statistik via danstat 📦, plots made w/ #ggplot in #rstats

www.gregdubrow.io/posts/30-day...
Circle graph displaying bachelor's degrees awarded by discipline in Denmark in 2023. Size of circle corresponds to number of degrees by discipline.
April 4, 2025 at 11:06 AM
gregerskjerulf.bsky.social
Circular is the #30DayChartChallenge day 3 prompt so here's 60 displaying monthly earnings by educ attainment, employment sector & type in 🇩🇰

In private sector, a Masters is worth 8K to 10K + DKK/month than Bacc. Effect ↗️ in regional govt jobs. #ggplot in #rstats

www.gregdubrow.io/posts/30-day...
Bubble plot displaying monthly earnings for workers in Denmark by highest education level, employment sector and employment type
April 3, 2025 at 10:33 AM
gregerskjerulf.bsky.social
The #30DayChartChallenge day 2 prompt is slope, so I made 4 slope graphs

Data from Danmarks Statistik via danstat 📦

Story here is betw 2005-2023, Danes of all ages have ↗️ levels of education. Especially younger Danes, as having a Masters is almost a necessity

www.gregdubrow.io/posts/30-day...
Four slope graphs displaying changes in rates of higher education by Danes between 2003 to 2025
April 2, 2025 at 2:14 PM