Andy Grogan-Kaylor
@agrogankaylor.bsky.social
190 followers 520 following 24 posts
I am a professor at the University of Michigan. I study parenting and child development, most recently using international data, and often using multilevel models. I work in both Stata and R.
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agrogankaylor.bsky.social
Why care about these technicalities?

Interactions are one of our major statistical tools for examining similarity or difference in statistical relationships across groups, identities, or contexts.
agrogankaylor.bsky.social
Interactions are often thought of as encompassing a main effect (x), and a moderator (m), but because of the commutative property of multiplication, interactions are essentially symmetric: agrogan1.github.io/posts/intera...
Interactions Are Symmetric – Andrew Grogan-Kaylor
agrogan1.github.io
agrogankaylor.bsky.social
For many models, adding a main effect and interaction for group can be seen as giving each group its own regression line with its own intercept and its own slope:

agrogan1.github.io/posts/intera...
agrogan1.github.io/posts/intera...
Interactions and Moderation – Andrew Grogan-Kaylor
agrogan1.github.io
agrogankaylor.bsky.social
A thread on #interactions and #moderation.
slope of a mountain
agrogankaylor.bsky.social
I argue that multilevel modeling is a principled way to explore human variation and commonality.
agrogankaylor.bsky.social
I try to provide a tutorial for applied researchers, and to bring "down to earth" some of the more advanced ideas about multilevel modeling that I see in the methodological literature, but rarely see in applied work.
agrogankaylor.bsky.social
Just similarity and difference across groups or countries, which I think, multilevel models let us start to see. Simply the size of the random slopes. Now that I’ve written the book, I need to figure out even better ways to quantify this.
agrogankaylor.bsky.social
I’d like to share that my book, Multilevel Thinking: Discovering Variation, Universals, and Particulars in Cross-Cultural Research is available for pre-order at Oxford University Press: global.oup.com/academic/pro...

* Includes appendices for estimating MLMs in #Stata, #Rstats, and #Julialang.
global.oup.com
agrogankaylor.bsky.social
We've published a new paper: Spillover of Macro-Level Violence to Parental Physical Abuse of Children in Low- and Middle-Income Countries. The paper should be online shortly, but in the meantime, we've prepared a scrollable summary here: globalfamilies.quarto.pub/spillover-of...
Countries in UNICEF MICS Data
agrogankaylor.bsky.social
Thank you for the kind words!
agrogankaylor.bsky.social
Same information as a treemap.
treemap showing that most of the world's children are not protected from physical punishment
agrogankaylor.bsky.social
Cartogram showing that most of the world's children are not protected from #corporal_punishment #rstats #gis
Most of the world's children are not protected from corporal punishment.
agrogankaylor.bsky.social
“Be Less Wrong”, the importance of multivariate, quantitative thinking, especially when thinking about treatments, programs, and interventions for social issues: globalfamilies.quarto.pub/be-less-wrong/
#closeread #quarto
One model accounts for group, while the other does not.
agrogankaylor.bsky.social
I experimented with using the new #closeread (closeread.dev/gallery/) extension for #Quarto to share the results of an article we published last year on parenting and child development in 60 countries: globalfamilies.quarto.pub/parenting/
What Should Parents Do?
globalfamilies.quarto.pub