Zachary Fisher
@fishingwithzack.bsky.social
Assistant Professor in Quantitative Psychology at UNC Chapel Hill.
Reposted by Zachary Fisher
Researchers often treat ordinal variables as continuous. What if we could mimic this in an ordinal factor analysis/IRT model? We propose new identification constraints so that the latent variable goes from 1 to (# of ordered categories), with connections to treating ordinal variables as continuous.
Identification and Scaling of Latent Variables in Ordinal Factor Analysis | Psychometrika | Cambridge Core
Identification and Scaling of Latent Variables in Ordinal Factor Analysis
doi.org
January 21, 2026 at 2:59 PM
Researchers often treat ordinal variables as continuous. What if we could mimic this in an ordinal factor analysis/IRT model? We propose new identification constraints so that the latent variable goes from 1 to (# of ordered categories), with connections to treating ordinal variables as continuous.
Reposted by Zachary Fisher
Enroll in my new workshop to realize your dream of learning IRT
#quantpsych #psychometrics #psychsky #statssky
#quantpsych #psychometrics #psychsky #statssky
Foundations of Item Response Theory
This workshop from Wes Bonifay focuses on the foundations and application of item response theory, particularly as applied to binary items.
centerstat.org
January 14, 2026 at 5:51 PM
Enroll in my new workshop to realize your dream of learning IRT
#quantpsych #psychometrics #psychsky #statssky
#quantpsych #psychometrics #psychsky #statssky
Reposted by Zachary Fisher
#rstats
It is with profound sadness I heard that my long-time friend and colleague, John Fox passed away this week.
He was the author of {car}, {effects}, {Rcmdr}, ... and numerous influential books. I will miss him greatly.
www.john-fox.ca
It is with profound sadness I heard that my long-time friend and colleague, John Fox passed away this week.
He was the author of {car}, {effects}, {Rcmdr}, ... and numerous influential books. I will miss him greatly.
www.john-fox.ca
John Fox: Books and Software
www.john-fox.ca
November 28, 2025 at 3:26 PM
#rstats
It is with profound sadness I heard that my long-time friend and colleague, John Fox passed away this week.
He was the author of {car}, {effects}, {Rcmdr}, ... and numerous influential books. I will miss him greatly.
www.john-fox.ca
It is with profound sadness I heard that my long-time friend and colleague, John Fox passed away this week.
He was the author of {car}, {effects}, {Rcmdr}, ... and numerous influential books. I will miss him greatly.
www.john-fox.ca
Reposted by Zachary Fisher
From my master’s thesis to my first PhD project — excited to share that this work (together with @jordanrvl.bsky.social, @ginettelafit.bsky.social, Anja Franziska Ernst, Josip Razum, Eva Ceulemans, and @bringmannlaura.bsky.social) is now published in AMPPS!
Link: doi.org/10.1177/2515...
Link: doi.org/10.1177/2515...
Meeting the Bare Minimum: Quality Assessment of Idiographic Temporal Networks Using Power Analysis and Predictive-Accuracy Analysis - Yong Zhang, Jordan Revol, Ginette Lafit, Anja F. Ernst, Josip Razu...
The network theory of psychopathology inspired clinicians and researchers to use idiographic networks to study how symptoms of an individual interact over time,...
doi.org
November 27, 2025 at 11:33 AM
From my master’s thesis to my first PhD project — excited to share that this work (together with @jordanrvl.bsky.social, @ginettelafit.bsky.social, Anja Franziska Ernst, Josip Razum, Eva Ceulemans, and @bringmannlaura.bsky.social) is now published in AMPPS!
Link: doi.org/10.1177/2515...
Link: doi.org/10.1177/2515...
Reposted by Zachary Fisher
A new publication from my PhD project on model selection for nonstationary time-series data is out, co-authored with an amazing team (Anja Franziska Ernst, @ginettelafit.bsky.social , Ward B. Eiling, @bringmannlaura.bsky.social)!
Link: doi.org/10.1111/bmsp...
Link: doi.org/10.1111/bmsp...
LinkedIn
This link will take you to a page that’s not on LinkedIn
lnkd.in
November 27, 2025 at 11:36 AM
A new publication from my PhD project on model selection for nonstationary time-series data is out, co-authored with an amazing team (Anja Franziska Ernst, @ginettelafit.bsky.social , Ward B. Eiling, @bringmannlaura.bsky.social)!
Link: doi.org/10.1111/bmsp...
Link: doi.org/10.1111/bmsp...
Reposted by Zachary Fisher
We’re hiring in Quantitative Psychology at UNC Chapel Hill!
Feel free to reach out if you have any questions about the program and please share widely!
unc.peopleadmin.com/postings/307...
Feel free to reach out if you have any questions about the program and please share widely!
unc.peopleadmin.com/postings/307...
Assistant Professor
Primary responsibilities of the position will include conducting high quality research, publishing in peer reviewed journals and broader dissemination, seeking external funding for research, teaching ...
unc.peopleadmin.com
October 2, 2025 at 9:18 PM
We’re hiring in Quantitative Psychology at UNC Chapel Hill!
Feel free to reach out if you have any questions about the program and please share widely!
unc.peopleadmin.com/postings/307...
Feel free to reach out if you have any questions about the program and please share widely!
unc.peopleadmin.com/postings/307...
Reposted by Zachary Fisher
UNC is hiring in Quantitative Psychology! Assistant Professor (tenure-track). Please share widely! Find details here: unc.peopleadmin.com/postings/307...
a logo for the carolina tar heels with a ram head
ALT: a logo for the carolina tar heels with a ram head
media.tenor.com
October 3, 2025 at 7:34 PM
UNC is hiring in Quantitative Psychology! Assistant Professor (tenure-track). Please share widely! Find details here: unc.peopleadmin.com/postings/307...
Reposted by Zachary Fisher
Wanted to announce that I will be recruiting graduate students this year in Quantitative Psychology here at UC Davis. If you are or know of any undergrads who are interested in dynamical systems and network analytic methods, please send them my way or get in touch!
October 3, 2025 at 1:18 AM
Wanted to announce that I will be recruiting graduate students this year in Quantitative Psychology here at UC Davis. If you are or know of any undergrads who are interested in dynamical systems and network analytic methods, please send them my way or get in touch!
We’re hiring in Quantitative Psychology at UNC Chapel Hill!
Feel free to reach out if you have any questions about the program and please share widely!
unc.peopleadmin.com/postings/307...
Feel free to reach out if you have any questions about the program and please share widely!
unc.peopleadmin.com/postings/307...
Assistant Professor
Primary responsibilities of the position will include conducting high quality research, publishing in peer reviewed journals and broader dissemination, seeking external funding for research, teaching ...
unc.peopleadmin.com
October 2, 2025 at 9:18 PM
We’re hiring in Quantitative Psychology at UNC Chapel Hill!
Feel free to reach out if you have any questions about the program and please share widely!
unc.peopleadmin.com/postings/307...
Feel free to reach out if you have any questions about the program and please share widely!
unc.peopleadmin.com/postings/307...
Reposted by Zachary Fisher
A new semester is upon us! This time, I’m teaching Structural Equation Modeling. Want to follow along? Here you go: jonathantemplin.github.io/Structural-E... and www.youtube.com/playlist?lis... #StatModeling #SEM
Structural Equation Modeling (Fall 2025; University of Iowa: PSQF 6249) – Structural Equation Modeling Fall 2025 (PSQF 6249)
jonathantemplin.github.io
August 28, 2025 at 4:29 PM
A new semester is upon us! This time, I’m teaching Structural Equation Modeling. Want to follow along? Here you go: jonathantemplin.github.io/Structural-E... and www.youtube.com/playlist?lis... #StatModeling #SEM
Reposted by Zachary Fisher
Now on CRAN, ggdiagram is a #ggplot2 extension that draws diagrams programmatically in #Rstats. Allows for precise control in how objects, labels, and equations are placed in relation to each other.
wjschne.github.io/ggdiagram/ar...
wjschne.github.io/ggdiagram/ar...
August 20, 2025 at 10:43 AM
Now on CRAN, ggdiagram is a #ggplot2 extension that draws diagrams programmatically in #Rstats. Allows for precise control in how objects, labels, and equations are placed in relation to each other.
wjschne.github.io/ggdiagram/ar...
wjschne.github.io/ggdiagram/ar...
Reposted by Zachary Fisher
This work was officially accepted for publication today!
New work by my lab members Sebastian Castro-Alvarez and Di Jody Zhou, in collaboration with @eikofried.bsky.social @bringmannlaura.bsky.social and others.
1/2
Our new preprint shows how to estimate internal consistency reliability in EMA data:
➡️n~1150, 3 months data, 4 scales
➡️6 nomothetic & idiographic methods
➡️2 timescales (4/day & 1/week)
➡️2 languages (ENG vs NL)
➡️separation of between & within person reliability.
#psychscisky #stats
Our new preprint shows how to estimate internal consistency reliability in EMA data:
➡️n~1150, 3 months data, 4 scales
➡️6 nomothetic & idiographic methods
➡️2 timescales (4/day & 1/week)
➡️2 languages (ENG vs NL)
➡️separation of between & within person reliability.
#psychscisky #stats
June 12, 2025 at 9:24 PM
This work was officially accepted for publication today!
Reposted by Zachary Fisher
Starting to look like I might not be able to work at Harvard anymore due to recent funding cuts. If you know of any open statistical consulting positions that support remote work or are NYC-based, please reach out! 😅
June 4, 2025 at 7:02 PM
Starting to look like I might not be able to work at Harvard anymore due to recent funding cuts. If you know of any open statistical consulting positions that support remote work or are NYC-based, please reach out! 😅
Reposted by Zachary Fisher
Postdoc position open in Zurich -- Prof. Martin Tomasik and I have a joint SNF project on interpretable neural network approaches for large scale, complex item / temporal structure, online learning / cognitive development data.
Please retweet.
tinyurl.com/PostdocGNNSNF
Please retweet.
tinyurl.com/PostdocGNNSNF
May 28, 2025 at 11:16 AM
Postdoc position open in Zurich -- Prof. Martin Tomasik and I have a joint SNF project on interpretable neural network approaches for large scale, complex item / temporal structure, online learning / cognitive development data.
Please retweet.
tinyurl.com/PostdocGNNSNF
Please retweet.
tinyurl.com/PostdocGNNSNF
Reposted by Zachary Fisher
🚀 PhD Position in Psychological Methods at @unimarburg.bsky.social
📅 Start: 01.10.2025 | 💼 50% TV-H E13 | ⏳ 3 years
Focus on statistical modeling—Bayesian statistics, cognitive modeling, psychometrics.
🔗 Apply now: uni-marburg.de/r5dKTr
🔄 Thanks for sharing!
📅 Start: 01.10.2025 | 💼 50% TV-H E13 | ⏳ 3 years
Focus on statistical modeling—Bayesian statistics, cognitive modeling, psychometrics.
🔗 Apply now: uni-marburg.de/r5dKTr
🔄 Thanks for sharing!
May 15, 2025 at 1:31 PM
🚀 PhD Position in Psychological Methods at @unimarburg.bsky.social
📅 Start: 01.10.2025 | 💼 50% TV-H E13 | ⏳ 3 years
Focus on statistical modeling—Bayesian statistics, cognitive modeling, psychometrics.
🔗 Apply now: uni-marburg.de/r5dKTr
🔄 Thanks for sharing!
📅 Start: 01.10.2025 | 💼 50% TV-H E13 | ⏳ 3 years
Focus on statistical modeling—Bayesian statistics, cognitive modeling, psychometrics.
🔗 Apply now: uni-marburg.de/r5dKTr
🔄 Thanks for sharing!
Reposted by Zachary Fisher
For anyone who'd like the verbal / visual introduction to my work in quant psych / dynamic systems (or a little of the personal background), I gave my inaugural lecture with UZH Monday night and it's available here: vimeo.com/showcase/826...
Antrittsvorlesung von Prof. Dr. Charles Driver
Human Behaviour, Cognition and Emotions as Dynamic Systems
vimeo.com
May 7, 2025 at 8:36 AM
For anyone who'd like the verbal / visual introduction to my work in quant psych / dynamic systems (or a little of the personal background), I gave my inaugural lecture with UZH Monday night and it's available here: vimeo.com/showcase/826...
Reposted by Zachary Fisher
We’re hiring postdocs to join my lab at UNC. If you’re interested in adolescence, brain, and social development, DM me. Our work incorporates fMRI, social media, and longitudinal methods. We study risks and opportunities in adolescence. If you’re at #SRCD2025 and want to meet, please reach out!
April 30, 2025 at 7:31 PM
We’re hiring postdocs to join my lab at UNC. If you’re interested in adolescence, brain, and social development, DM me. Our work incorporates fMRI, social media, and longitudinal methods. We study risks and opportunities in adolescence. If you’re at #SRCD2025 and want to meet, please reach out!
Reposted by Zachary Fisher
📚😅🎉
Yay!! I just submitted the complete manuscript of my upcoming book to the publisher!
Learn to easily and clearly interpret (almost) any stats model w/ R or Python. Simple ideas, consistent workflow, powerful tools, detailed case studies.
Read it for free @ marginaleffects.com
#RStats #PyData
Yay!! I just submitted the complete manuscript of my upcoming book to the publisher!
Learn to easily and clearly interpret (almost) any stats model w/ R or Python. Simple ideas, consistent workflow, powerful tools, detailed case studies.
Read it for free @ marginaleffects.com
#RStats #PyData
April 10, 2025 at 7:06 PM
📚😅🎉
Yay!! I just submitted the complete manuscript of my upcoming book to the publisher!
Learn to easily and clearly interpret (almost) any stats model w/ R or Python. Simple ideas, consistent workflow, powerful tools, detailed case studies.
Read it for free @ marginaleffects.com
#RStats #PyData
Yay!! I just submitted the complete manuscript of my upcoming book to the publisher!
Learn to easily and clearly interpret (almost) any stats model w/ R or Python. Simple ideas, consistent workflow, powerful tools, detailed case studies.
Read it for free @ marginaleffects.com
#RStats #PyData
Reposted by Zachary Fisher
This paper on intensive longitudinal reliability led by Sebastian Castro-Alvarez is one of the best I've read in a while -- the review was so thorough, the code was fantastic, and it answered any questions I had about IL reliability. Definitely check it out you work with ILD!
osf.io/preprints/ps...
osf.io/preprints/ps...
OSF
osf.io
January 29, 2025 at 7:39 PM
This paper on intensive longitudinal reliability led by Sebastian Castro-Alvarez is one of the best I've read in a while -- the review was so thorough, the code was fantastic, and it answered any questions I had about IL reliability. Definitely check it out you work with ILD!
osf.io/preprints/ps...
osf.io/preprints/ps...
Reposted by Zachary Fisher
🤓Latent GOLD licenses for academic use are now freely available on the website! www.statisticalinnovations.com/shop/lg-6-1-...
LatentGOLD 6.1 Academic New License - Statistical Innovations
LG 5.1 Academic Latent GOLD new license LG Choice Advanced Syntax Latent Class Discrete Choice 3step markov multilevel scale factor 5.1 annual perpetual
www.statisticalinnovations.com
January 6, 2025 at 8:54 AM
🤓Latent GOLD licenses for academic use are now freely available on the website! www.statisticalinnovations.com/shop/lg-6-1-...
Reposted by Zachary Fisher
My first paper as an Assistant Professor at UC Davis is out in the journal SEM!
In the paper, we introduce a continuous-time extension to the GIMME model implemented in OpenMx. It uses iterative tests of modification indices to construct group- and person-specific dynamic networks!
In the paper, we introduce a continuous-time extension to the GIMME model implemented in OpenMx. It uses iterative tests of modification indices to construct group- and person-specific dynamic networks!
Unsupervised Model Construction in Continuous-Time
Many of the advancements reconciling individual- and group-level results have occurred in the context of a discrete-time modeling framework. Discrete-time models are intuitive and offer relatively ...
www.tandfonline.com
December 16, 2024 at 9:36 PM
My first paper as an Assistant Professor at UC Davis is out in the journal SEM!
In the paper, we introduce a continuous-time extension to the GIMME model implemented in OpenMx. It uses iterative tests of modification indices to construct group- and person-specific dynamic networks!
In the paper, we introduce a continuous-time extension to the GIMME model implemented in OpenMx. It uses iterative tests of modification indices to construct group- and person-specific dynamic networks!
Reposted by Zachary Fisher
For the quant methods people in my circle:
Tenure-track Assistant Professor specializing in measurement and psychometric issues related to complex data structures.
Tenure-track Assistant Professor specializing in measurement and psychometric issues related to complex data structures.
Assistant Professor (Measurement Issues in Complex Data Structures) in the UCLA Department of Psychology recruit.apo.ucla.edu/JPF09885
Assistant Professor (Measurement Issues in Complex Data Structures) in the UCLA Department of Psychology
University of California, Los Angeles is hiring. Apply now!
recruit.apo.ucla.edu
December 3, 2024 at 7:35 PM
For the quant methods people in my circle:
Tenure-track Assistant Professor specializing in measurement and psychometric issues related to complex data structures.
Tenure-track Assistant Professor specializing in measurement and psychometric issues related to complex data structures.
Reposted by Zachary Fisher
Scientists don't have to be in academia to make a huge impact! Check out this new resource for details, salaries, etc on how to pick a career!
#psychology #PsychSky #mentalhealth #PsychSciSky #Skychiatry #Neuroskyence #neuroimaging
#PsychSciSky #CogPsyc #ClinPsych
www.apa.org/science/prog...
#psychology #PsychSky #mentalhealth #PsychSciSky #Skychiatry #Neuroskyence #neuroimaging
#PsychSciSky #CogPsyc #ClinPsych
www.apa.org/science/prog...
www.apa.org
December 3, 2024 at 6:21 PM
Scientists don't have to be in academia to make a huge impact! Check out this new resource for details, salaries, etc on how to pick a career!
#psychology #PsychSky #mentalhealth #PsychSciSky #Skychiatry #Neuroskyence #neuroimaging
#PsychSciSky #CogPsyc #ClinPsych
www.apa.org/science/prog...
#psychology #PsychSky #mentalhealth #PsychSciSky #Skychiatry #Neuroskyence #neuroimaging
#PsychSciSky #CogPsyc #ClinPsych
www.apa.org/science/prog...
Reposted by Zachary Fisher
This article gives a phenomenal overview of the history and evolution of best practices in measurement invariance and differential item functioning -- I can't remember the last time I learned so much reading a single paper, highly recommended!
www.tandfonline.com/doi/full/10....
www.tandfonline.com/doi/full/10....
A Review of Some of the History of Factorial Invariance and Differential Item Functioning
The concept of factorial invariance has evolved since it originated in the 1930s as a criterion for the usefulness of the multiple factor model; it has become a form of analysis supporting the vali...
www.tandfonline.com
November 13, 2024 at 10:25 PM
This article gives a phenomenal overview of the history and evolution of best practices in measurement invariance and differential item functioning -- I can't remember the last time I learned so much reading a single paper, highly recommended!
www.tandfonline.com/doi/full/10....
www.tandfonline.com/doi/full/10....