Hanbin Lee's Avatar

Hanbin Lee

@epigenci.bsky.social

PhD Student at UMich Statistics. The account mostly trashes about urban planning and infrastructure. Probability, Statistics, and Evolutionary Biology. https://hanbin973.github.io

738 Followers  |  2,113 Following  |  659 Posts  |  Joined: 19.09.2023  |  1.7507

Latest posts by epigenci.bsky.social on Bluesky

Just took a bus around the North campus and even the dorms are sprawled in this area. Apartments are all maximum 2.5 floors high and more than half of the land is parking lots. Damn cursed.

07.12.2025 20:15 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

I feel very stupid after searching "next letter of omega" on google. I badly needed something for an n-form :(

06.12.2025 22:31 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

My experience in the US is that the lack of physical connectivity in many parts of the country, of which have been deliberately created over decades, considerably hampers the dissemination of modern policies. I wonder how the numbers look like after conditioning on rural vs suburb vs urban.

06.12.2025 15:59 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Another thing that bothers me is ergodicity. Distribution over one dimension (e.g. time) coincides with the distribution over another dimension (e.g. replicates) if certain conditions are met. Is this obscuring us from recognizing something important?

06.12.2025 15:55 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Am I a MAGA fan now?

05.12.2025 18:15 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

And, do we even care about IQ? It is like the Impact Factor of intelligence...

04.12.2025 23:10 β€” πŸ‘ 25    πŸ” 7    πŸ’¬ 2    πŸ“Œ 2
Post image

www.biorxiv.org/content/10.6...
What surprised me is Figure 6 in which the distribution of the points looks very similar to what I've encountered in a very different setting. I wonder if this is some sort of a very general statistical phenomenon.

05.12.2025 01:37 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

end of class! no more daily homeworks :)

04.12.2025 20:16 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Preview
The academics who stuck by financier to the end – and those who didn’t | The Observer

Don't forget all these repulsive men who helped boost Jeffrey Epstein's reputation even after his horrific deeds were well known.

observer.co.uk/news/interna...

People like Martin Nowak, Steven Pinker, Alan Dershowitz, Larry Summers, Lawrence Krauss, et al

04.12.2025 05:58 β€” πŸ‘ 66    πŸ” 20    πŸ’¬ 3    πŸ“Œ 5

I wonder how administration and representation can be separated looking at gerrymendered maps.

03.12.2025 13:44 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Preview
On the Approximation of Phylogenetic Distance Functions by Artificial Neural Networks Inferring the phylogenetic relationships among a sample of organisms is a fundamental problem in modern biology. While distance-based hierarchical clustering algorithms achieved early success on this ...

New paper on minimal NNs for phylogenetic inference, with former grad student, Ben Rosenzweig:

arxiv.org/abs/2512.02223

03.12.2025 12:29 β€” πŸ‘ 25    πŸ” 8    πŸ’¬ 1    πŸ“Œ 0

I remember you asking about the purpose of omitting a information (here, location of materialized mutations). My tentative answer is that the we get a simpler model (no confounding) at a cost of perhaps lower precision (e.g prediction accuracy of BLUP) due to omitting information.

02.12.2025 19:40 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

That was part of my convoluted thoughts. All, if not most, the papers making the claim that "GRM is enough" is marginalizing possible evolutionary paths, removing those non-direction flunctuations away from the model. This is obvious in our paper because mutations are treated as random.

02.12.2025 19:38 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

It certainly depends on the model assumption. I have a few convoluted arguments in my mind, perhaps the most intuitive one will be that such a directional LD can't be there in the absence of selection.

02.12.2025 17:15 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

The overall gaussian-ish assumption allows us to discard many of the higher-order terms and makes it clearer how these terms could be handled in more general cases.

02.12.2025 13:50 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

I think I finally follow the parent-offspring regression shit. This sounds like conditioning on a pedigree, but it's in fact not because parents are being randomly selected. Hence, it's equivalent to forming an infinite gamete pool first and then forming a new individual out of it.

02.12.2025 13:48 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
Post image Post image

An interesting rabbit hole that I have yet dug into is that population structure alone cannot drive genetic variance inflation in the estimates. We did a spatial simulation exhibiting a very strong isolation-by-distance pattern. The estimated variance components are consistent.

02.12.2025 00:18 β€” πŸ‘ 4    πŸ” 1    πŸ’¬ 1    πŸ“Œ 0
Preview
Observational epidemiological studies can mitigate genetic confounding with the genetic relatedness matrix Observational studies are commonly used in psychology and epidemiology to identify risk factors correlated with health outcomes. However, these studies are vulnerable to confounding when shared geneti...

Excited to share work from my postdoc with @docedge.bsky.social and collaborators Matt Pennell and @jgschraiber.bsky.social, newly out over the weekend: www.biorxiv.org/content/10.1... (1/6)

01.12.2025 19:09 β€” πŸ‘ 60    πŸ” 28    πŸ’¬ 2    πŸ“Œ 2
Depictions of evolution where a phylogeny often has humans on the far right or top can give an impression of evolution being progressive of leading to β€˜increased complexity’ when it does not. Top figure shows such a phylogeny which can look the same as β€˜the March of progress’ depiction most commonly used to depict evolution (showing monkey to man erroneous march of evolution) - instead swiveling some nodes on a phylogeny where humans are shown closer to the center (which doesn’t change relationships) can lead to better β€˜tree thinking’

Depictions of evolution where a phylogeny often has humans on the far right or top can give an impression of evolution being progressive of leading to β€˜increased complexity’ when it does not. Top figure shows such a phylogeny which can look the same as β€˜the March of progress’ depiction most commonly used to depict evolution (showing monkey to man erroneous march of evolution) - instead swiveling some nodes on a phylogeny where humans are shown closer to the center (which doesn’t change relationships) can lead to better β€˜tree thinking’

New post by me on #MITPressReader @mitpress.bsky.social

On the 100th anniversary of the #ScopesMonkeyTrial
the ways we depict #evolution can still give an erroneous progressive view (that evolution leads to humans or β€˜increased complexity’).

thereader.mitpress.mit.edu/is-our-pictu...

01.12.2025 17:56 β€” πŸ‘ 594    πŸ” 206    πŸ’¬ 12    πŸ“Œ 13

I now automatically think of gerrymendering whenever I see decision boundaries.

01.12.2025 16:54 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Preview
Single-cell phylodynamics reveal rapid late-stage colorectal cancer expansions Single-cell whole-genome sequencing of 335 cells from seven colorectal cancers, coupled with Bayesian phylodynamic modeling, revealed tumors often originate decades before diagnosis, remain indolent, ...

www.biorxiv.org/content/10.1... hm?

01.12.2025 15:44 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

λΉˆλ„μ£Όμ˜μ  ν†΅κ³„λ‘œμ¨ 신뒰ꡬ간은, λ‚΄κ°€ ν•˜λŠ” λ°©λ²•λ‘ μ˜ 신뒰성을 λ“œλŸ¬λ‚΄λŠ”κ±°μ§€ λ‚΄κ°€ ν•œ 번 λ§Œλ“€μ–΄λ‚Έ κ²°κ³Όκ°’μ˜ 신뒰성을 λ“œλŸ¬λ‚΄λŠ”κ²Œ μ•„λ‹ˆλ‹€. 근데 μ•„λ§ˆ λ² μ΄μ§€μ–Έμ μœΌλ‘œ ν™•μ‹ κ΅¬κ°„μœΌλ‘œ 연산해도 사싀상 λΉ„μŠ·ν•œ λ²”μœ„κ°€ λ‚˜μ˜€κΈ΄ν• κΊΌλ‹€. 무슨 μ „κ΅­μ—¬μ‘°μ„œ μ „κ΅­ 1%p λ³€λ™μ΄λ‚˜ κ°œλ³„μ§€μ—­, μ„±μ—°λ Ή μ‹­ν”„λ‘œ μ•ˆ 변동을 κ°–κ³  썰 ν‘ΈλŠ”κ²Œ 일상인 보도 νŒμ—, ν‘œλ³ΈνŽΈν–₯ κ³ λ―Όν•˜λ©° 접촉λ₯  ν˜‘μ‘°μœ¨μ— 가럽만큼의 μ• μ“°κ³  μ‹ μ€‘ν•œ ν‘œν˜„ν•˜λŠ” κ²ƒλ§ŒμœΌλ‘œλ„ κ°μ§€λ•μ§€ν•˜λ‹€. μ—…λ ₯이 괜히 λ‚˜μ˜€λŠ”κ²Œ μ•„λ‹ˆλ‹€.

01.12.2025 03:32 β€” πŸ‘ 2    πŸ” 2    πŸ’¬ 1    πŸ“Œ 1

We tried to make the paper more focused on variance component estimation and genetic prediction. Other points raised in the earlier paper will be discussed in future works.

30.11.2025 17:13 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Preview
Genetic prediction with ARG-powered linear algebra Ancestral recombination graphs (ARGs) are an attractive means for quantitative genetic analysis of complex traits because they encode the realized genetic relatedness between a sample of individuals i...

www.biorxiv.org/content/10.1...

We finally submitted the earlier preprint to a journal after massive restructuring.
We've expanded the REML section for those interested in the method. We clarify that ARG-LMM estimates mutational variance and not additive variance.

30.11.2025 17:08 β€” πŸ‘ 14    πŸ” 7    πŸ’¬ 1    πŸ“Œ 1
Post image

Transit should be at forefront of any climate resiliency plan. Take snow. A bus is heavy and piloted by a trained driver; much safer in snow (or heavy rainfall) than the relatively light vehicles driven by civilians. Bus riders take vehicles off the streets, which speeds plowing, emergency response.

30.11.2025 15:08 β€” πŸ‘ 63    πŸ” 15    πŸ’¬ 1    πŸ“Œ 2

techbros everywhere lol

30.11.2025 13:46 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Post image

Curriculum shapes more than skills as taking STEM in high school boosts tech careersβ€”but also shifts politics as boys grow more conservative and girls more progressive, from Robert Ainsworth, Rajeev H. Dehejia, Andrei Munteanu, Cristian Pop-Eleches, and Miguel Urquiola www.nber.org/papers/w34502

27.11.2025 18:02 β€” πŸ‘ 13    πŸ” 9    πŸ’¬ 0    πŸ“Œ 1

www.biorxiv.org/content/10.1... looks useful?

30.11.2025 04:49 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

pubmed.ncbi.nlm.nih.gov/41001573/

30.11.2025 03:20 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

I got something to tell to my thesis committee member

29.11.2025 16:52 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

@epigenci is following 20 prominent accounts