Welcome to my website! I am a biostatistician with research interests in statistical methods for genetics studies. I also maintain R packages that enable multivariate analysis in systems genetics studies.


For the past eight weeks, I’ve studied improvisational comedy with the Upright Citizens Brigade. While the UCB is based in Los Angeles, our class sessions and the show occurred over zoom. Please find the ~30-minute video on youtube: https://youtu.be/T_zE1wdKY8s. Enjoy!

Updating `qtlbim`

15 February 2021

I’m excited to announce that I’ve updated the R package qtlbim. I forked the code from the CRAN Github repo for qtlbim. Here is the updated qtlbim repository in my Github account. It now works smoothly with gcc10, thanks to patches from Dirk Eddelbuettel. Installation To install qtlbim from my Github repository, type this code: remotes::install_github("fboehm/qtlbim") Getting started with Bayesian QTL mapping Once you’ve installed qtlbim, browse the vignettes to find example analyses.

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Tomorrow my lab will participate in #ShutDownAcademia #ShutDownSTEM. I’ll stay at home instead of traveling to my office. And instead of doing my usual research, I’ll read, watch, and listen to pieces listed on the organizers’ website: https://www.shutdownstem.com/.

I hope that you’ll join me in participating.

Mathematician John Urschel recommended this article from the American Mathematical Society: https://www.ams.org/journals/notices/201802/rnoti-p149.pdf

I have the opportunity to present a poster at The Allied Genetics Conference (TAGC) 2020. I’ve posted both a pdf of the poster and a mp4 narrated video tour of the poster here.

I’d love to address your questions and hear your suggestions in the Q & A session on Thursday, April 30, at 1:30pm Eastern Time. My poster number is 1333A.

(Last modified: 2020-04-27 15:49:12)

qtl2pleio on CRAN

10 January 2020

CRAN now hosts the packages qtl2pleio and gemma2. qtl2pleio performs a d-variate, d-QTL scan over a select genomic region. gemma2 is used by qtl2pleio for the inference of multivariate variance components. They can be installed with: install.packages("qtl2pleio") The statistical model that qtl2pleio fits for each d-tuple of markers (or pseudomarkers) is \[ vec(Y) = Xvec(B) + vec(G) + vec(E) \] where \(Y\) is a n by d matrix of d traits (for each of n subjects), X is a dn by df block-diagonal matrix of founder allele probabilities, B is a f by d matrix of allele effects for each of d traits, G is a n by d matrix of polygenic random effects, and E is a n by d matrix of random errors.

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Recent Works

  • qtl2pleio: Testing pleiotropy vs. separate QTL after Jiang & Zeng (1995). (2021)          
  • gemma2: Multivariate random effects for systems genetics studies. (2021)          
  • What is Happening on Twitter? A Framework for Student Research Projects with Tweets. Frederick J. Boehm and Bret M. Hanlon (2021) doi:10.1080/10691898.2020.1848486  
  • Genetic Background Modifies Phenotypic Severity and Longevity in a Mouse Model of Niemann-Pick Disease Type C1. Jorge L. Rodriguez-Gil, Dawn E. Watkins-Chow, Laura L. Baxter, Gene Elliot, Ursula L. Harper, Stephen M. Wincovitch, Julia C. Wedel, Arturo A. Incao, Mylene Huebecker, Frederick J. Boehm, William S. Garver, Forbes D. Porter, Karl W. Broman, Frances M. Platt and William J. Pavan (2020) doi:10.1242/dmm.042614  
  • Testing pleiotropy in multiparental populations, Early career scientist seminar, Genetics Society of America, online, Oct 17, 2019  
  • Genetic determinants of gut microbiota composition and bile acid profiles in mice. Julia H. Kemis, Vanessa Linke, Kelsey L. Barrett, Frederick J. Boehm, Lindsay L. Traeger, Mark P. Keller, Mary E. Rabaglia, Kathryn L. Schueler, Donald S. Stapleton, Daniel M. Gatti, Gary A. Churchill, Daniel Amador-Noguez, Jason D. Russell, Brian S. Yandell, Karl W. Broman, Joshua J. Coon, Alan D. Attie and Federico E. Rey (2019) doi:10.1371/journal.pgen.1008073  
  • qtl2pleio: Testing pleiotropy vs. separate QTL in multiparental populations. Frederick Boehm, Brian Yandell and Karl W. Broman (2019) doi:10.21105/joss.01435  
  • Testing Pleiotropy vs. Separate QTL in Multiparental Populations. Frederick J. Boehm, Elissa J. Chesler, Brian S. Yandell and Karl W. Broman (2019) doi:10.1534/g3.119.400098  
  • Testing pleiotropy in multiparental populations, Thesis defense, University of Wisconsin-Madison, Madison, Wisconsin, USA, Apr 21, 2019    
  • Testing pleiotropy in multiparental populations, International Mammalian Genomics Conference, Rio Mar, Puerto Rico, USA, Nov 6, 2018