Liam Revell

Evolutionary biologist, R developer, & occasional heterodox. Tweets mostly about phylogenetics... but sometimes speech, the academy, politics, & COVID.

[Liam Revell @phytools_liam]

That's a real, physical book, people. @lukejharmon #Rstats https://t.co/z0IMsz2QVX

[Liam Revell @phytools_liam]

UMass Boston Department of Biology is hiring a plant ecologist or evolutionary biologist. Please share! https://t.co/h9Qs5MPGRl

[Liam Revell @phytools_liam]

My department at UMass Boston is searching for an Assistant Professor of Biology in the area of plant ecology &/or evolution. Please contact me with any questions, share widely, and check out the job ad here: https://t.co/ZRXZWof8B9.

[Liam Revell @phytools_liam]

It's probably not the meaning of life, but your h-index is only ever 42 once.

[Liam Revell @phytools_liam]

IMO, this is the most significant paper I've written (with various colleagues, incl. @lukejharmon) in at least 10 years, if not my entire career.

After addressing some reviewer feedback, I just posted a new version to @biorxivpreprint.

Check it out: https://t.co/91Ow75YG7T.

[Liam Revell @phytools_liam]

With various colleagues including @lukejharmon I just published a new pre-print to @biorxivpreprint entitled "Unlocking a flexible set of phylogenetic models for discrete and continuous trait evolution using discretized stochastic diffusion." https://t.co/91Ow75YG7T 1/7

[Liam Revell @phytools_liam]

#phytools::fitmultiOU vs. stochastic mapping + OUwie... a small experiment, but a strong case for joint continuous/discrete character modelling: https://t.co/4EJzEf65Oq.

[Liam Revell @phytools_liam]

Stochastic character mapping under the threshold model from evolutionary quantitative genetics using #phytools: https://t.co/fJl5oqUHX3.

[Liam Revell @phytools_liam]

Comparing a discrete character dependent multi-regime OU joint model in #phytools to OUwie: https://t.co/vfemXItHjq.

[Liam Revell @phytools_liam]

Today I was reminded of this post from the #phytools blog archive: "Fitting a Pagel '94 type model to test the hypothesis that the rate of evolution in one discrete character (with any number of levels) depends on the state of another." https://t.co/nb9gdxRTs7

[Liam Revell @phytools_liam]

More on a discrete character dependent multi-optimum OU model in #phytools: https://t.co/LpLHskJoo6.

[Liam Revell @phytools_liam]

For more on this model, check out my prior post here: https://t.co/vh5G1tXtE1. 2/2

[Liam Revell @phytools_liam]

This is a prototype that should be treated with extreme caution, but here's a discrete-character-dependent multi-θ Ornstein-Uhlenbeck model for #phytools: https://t.co/ruC5s2t8M0.

[Liam Revell @phytools_liam]

Today on my blog -- null model for discrete character dependent multi-θ Ornstein-Uhlenbeck model in #phytools: https://t.co/R2aTBEkLwr. 1/2

[Liam Revell @phytools_liam]

This is a prototype that should be treated with extreme caution, but here's a discrete-character-dependent multi-θ Ornstein-Uhlenbeck model for #phytools: https://t.co/ruC5s2t8M0.

[Liam Revell @phytools_liam]

Simulating & visualizing a discrete-character-dependent multi-regime OU process on a phylogenetic tree using #phytools: https://t.co/xD0t3dYt1v.

[Liam Revell @phytools_liam]

Ancestral state estimation using the discretized diffusion approximation in #phytools with bounded_bm > ancr: https://t.co/2I5P5a89H1.

[Liam Revell @phytools_liam]

A not-so-old #phytools method that I'd kind of forgotten about... S3 generic plotting of the "fastAnc" object class: https://t.co/zlx26Rb7a9.

[Liam Revell @phytools_liam]

This is an older #phytools plotting method, but still kind of fun - - an ANSI text phylogeny simulator in R: https://t.co/2bU2p2XMxk.

[Liam Revell @phytools_liam]

This post to the #phytools blog is not super interesting... it just shows how a discrete approximation can be used to compute the likelihood under OU as well as BM, which DOES have some interesting use-cases (just not any I actually explore in the post): https://t.co/guiNUPfR6w.

[Liam Revell @phytools_liam]

If anyone's interested, I just posted about accurate estimation of shape parameter α for Γ-distributed variation in the rate of discrete character evolution by edge using #phytools: https://t.co/IsGT1ZjHEF.

[Liam Revell @phytools_liam]

I've been blogging (at https://t.co/UpMCIR9AS1) and speaking about this project for a while, but please check out our new pre-print here & let me know what you think: https://t.co/91Ow75YG7T. Thanks! 7/7

[Liam Revell @phytools_liam]

With various colleagues including @lukejharmon I just published a new pre-print to @biorxivpreprint entitled "Unlocking a flexible set of phylogenetic models for discrete and continuous trait evolution using discretized stochastic diffusion." https://t.co/91Ow75YG7T 1/7

[Liam Revell @phytools_liam]

... and a discrete-character-dependent multi-trend trended Brownian model, among other evolutionary scenarios. 6/7