Johnny Felt
@jfeltphd.bsky.social
Quantitative methodologist interested in Bayesian and frequentist approaches to longitudinal data analysis, causal inference, and measurement. Assistant Research Professor in the Center for Healthy Aging at Penn State. UC Merced Quant Psych Alum.
Reposted by Johnny Felt
I presented some of my work in the Data Blitz portion of this webinar today! If you missed it, the recording and slides will be up on the Stress Measurement Network soon.
🗣 Join the Stress Measurement Network for a webinar digging into "𝐓𝐡𝐞 𝐁𝐢𝐨𝐥𝐨𝐠𝐢𝐜𝐚𝐥 𝐂𝐨𝐬𝐭 𝐨𝐟 𝐂𝐡𝐫𝐨𝐧𝐢𝐜 𝐒𝐭𝐫𝐞𝐬𝐬: 𝐀𝐥𝐥𝐨𝐬𝐭𝐚𝐭𝐢𝐜 𝐋𝐨𝐚𝐝 𝐚𝐧𝐝 𝐍𝐞𝐰𝐞𝐫 𝐂𝐨𝐧𝐜𝐞𝐩𝐭𝐮𝐚𝐥𝐢𝐳𝐚𝐭𝐢𝐨𝐧𝐬"
Date: November 7, 2025
Time: 9:00 AM to 12:00 PM PDT
Sign up here: www.stressmeasurement.org/event-detail...
#psychscisky #healthpsych #affectsci
Date: November 7, 2025
Time: 9:00 AM to 12:00 PM PDT
Sign up here: www.stressmeasurement.org/event-detail...
#psychscisky #healthpsych #affectsci
November 7, 2025 at 11:06 PM
I presented some of my work in the Data Blitz portion of this webinar today! If you missed it, the recording and slides will be up on the Stress Measurement Network soon.
Super cool new study by @kvanbogart.bsky.social looking into differences between chronic and acute loneliness!
Chronic loneliness harms health, but what differentiates chronic from acute experiences of loneliness? My newest publication dives into the subtle differences of loneliness in daily life. Read more: psycnet.apa.org/doiLanding?d...
APA PsycNet
psycnet.apa.org
November 7, 2025 at 1:50 AM
Super cool new study by @kvanbogart.bsky.social looking into differences between chronic and acute loneliness!
Take a look at our new pre print for different approach on how to calculate the dynamic range of diurnal cortisol, led by the talented @kvanbogart.bsky.social
New preprint!
Interested in examining HPA axis regulation or allostatic load? We present three approaches to computing the dynamic range of diurnal cortisol — with advantages, limitations, and examples with R code for each approach.
osf.io/preprints/os...
Interested in examining HPA axis regulation or allostatic load? We present three approaches to computing the dynamic range of diurnal cortisol — with advantages, limitations, and examples with R code for each approach.
osf.io/preprints/os...
OSF
osf.io
July 26, 2025 at 5:59 PM
Take a look at our new pre print for different approach on how to calculate the dynamic range of diurnal cortisol, led by the talented @kvanbogart.bsky.social
Reposted by Johnny Felt
New preprint!
Interested in examining HPA axis regulation or allostatic load? We present three approaches to computing the dynamic range of diurnal cortisol — with advantages, limitations, and examples with R code for each approach.
osf.io/preprints/os...
Interested in examining HPA axis regulation or allostatic load? We present three approaches to computing the dynamic range of diurnal cortisol — with advantages, limitations, and examples with R code for each approach.
osf.io/preprints/os...
OSF
osf.io
July 25, 2025 at 3:15 PM
New preprint!
Interested in examining HPA axis regulation or allostatic load? We present three approaches to computing the dynamic range of diurnal cortisol — with advantages, limitations, and examples with R code for each approach.
osf.io/preprints/os...
Interested in examining HPA axis regulation or allostatic load? We present three approaches to computing the dynamic range of diurnal cortisol — with advantages, limitations, and examples with R code for each approach.
osf.io/preprints/os...
Reposted by Johnny Felt
I will be damned if I allow a bunch of Confederate-waving January 6th apologists give the American people a lecture on flag waving.
There is ZERO reason to enter an argument about patriotism with people who still worship traitors to America 150+ years later.
They. Are. Breaking. The. Law.
There is ZERO reason to enter an argument about patriotism with people who still worship traitors to America 150+ years later.
They. Are. Breaking. The. Law.
June 11, 2025 at 1:21 AM
I will be damned if I allow a bunch of Confederate-waving January 6th apologists give the American people a lecture on flag waving.
There is ZERO reason to enter an argument about patriotism with people who still worship traitors to America 150+ years later.
They. Are. Breaking. The. Law.
There is ZERO reason to enter an argument about patriotism with people who still worship traitors to America 150+ years later.
They. Are. Breaking. The. Law.
Reposted by Johnny Felt
📅 Save the date – May 14 @ 1:30 p.m.! Join us for our BERD Workshop Webinar: “Causal Inferences for Experimental and Quasi-Experimental Designs” |✅ Reserve your spot: bit.ly/4jB2EIU
April 18, 2025 at 7:34 PM
📅 Save the date – May 14 @ 1:30 p.m.! Join us for our BERD Workshop Webinar: “Causal Inferences for Experimental and Quasi-Experimental Designs” |✅ Reserve your spot: bit.ly/4jB2EIU
Reposted by Johnny Felt
You can follow along with members of our Early Career Editorial Board through this starter pack: go.bsky.app/7wdxZUn
January 9, 2025 at 8:21 PM
You can follow along with members of our Early Career Editorial Board through this starter pack: go.bsky.app/7wdxZUn
Check out this new one from JAMA Pediatrics that I did the analyses for
jamanetwork.com/journals/jam...
We used Synthetic Control Method to evaluate the effectiveness of a coordinated county-level child sexual abuse prevention intervention program
jamanetwork.com/journals/jam...
We used Synthetic Control Method to evaluate the effectiveness of a coordinated county-level child sexual abuse prevention intervention program
Rates of Population-Level Child Sexual Abuse After a Community-Wide Preventive Intervention
This study tests whether a coordinated, community-wide preventive intervention could significantly reduce population-level incidence rates of child sexual abuse.
jamanetwork.com
March 3, 2025 at 11:59 PM
Check out this new one from JAMA Pediatrics that I did the analyses for
jamanetwork.com/journals/jam...
We used Synthetic Control Method to evaluate the effectiveness of a coordinated county-level child sexual abuse prevention intervention program
jamanetwork.com/journals/jam...
We used Synthetic Control Method to evaluate the effectiveness of a coordinated county-level child sexual abuse prevention intervention program
Reposted by Johnny Felt
The BSAM @psychosommed.bsky.social Early Career Editorial Board provides a pathway for outstanding early career researchers around the globe to gain experience in reviewing and editorial functions. Apply by April 15. Please share with colleagues and rebleat!
journals.lww.com/bsam/Documen...
journals.lww.com/bsam/Documen...
journals.lww.com
February 19, 2025 at 7:16 PM
The BSAM @psychosommed.bsky.social Early Career Editorial Board provides a pathway for outstanding early career researchers around the globe to gain experience in reviewing and editorial functions. Apply by April 15. Please share with colleagues and rebleat!
journals.lww.com/bsam/Documen...
journals.lww.com/bsam/Documen...
Reposted by Johnny Felt
EMA/Daily Diary researchers!
Do you have a dataset with momentary or daily loneliness among adults 18+? @kvanbogart.bsky.social is seeking datasets to support a coordinated data analysis
Email Karina.vanbogart@northwestern.edu with a brief description of your dataset to be considered! #psychscisky
Do you have a dataset with momentary or daily loneliness among adults 18+? @kvanbogart.bsky.social is seeking datasets to support a coordinated data analysis
Email Karina.vanbogart@northwestern.edu with a brief description of your dataset to be considered! #psychscisky
January 31, 2025 at 8:14 PM
EMA/Daily Diary researchers!
Do you have a dataset with momentary or daily loneliness among adults 18+? @kvanbogart.bsky.social is seeking datasets to support a coordinated data analysis
Email Karina.vanbogart@northwestern.edu with a brief description of your dataset to be considered! #psychscisky
Do you have a dataset with momentary or daily loneliness among adults 18+? @kvanbogart.bsky.social is seeking datasets to support a coordinated data analysis
Email Karina.vanbogart@northwestern.edu with a brief description of your dataset to be considered! #psychscisky
Reposted by Johnny Felt
Yes, this administration is dangerous and cruel, but they are also shockingly dim and incompetent.
Opportunities are everywhere.
Make everything as hard as possible. Resist every demand. Refuse entry without a warrant. Don’t take the buyout. Their problem solving skills are 📉
Opportunities are everywhere.
Make everything as hard as possible. Resist every demand. Refuse entry without a warrant. Don’t take the buyout. Their problem solving skills are 📉
January 30, 2025 at 2:35 AM
Yes, this administration is dangerous and cruel, but they are also shockingly dim and incompetent.
Opportunities are everywhere.
Make everything as hard as possible. Resist every demand. Refuse entry without a warrant. Don’t take the buyout. Their problem solving skills are 📉
Opportunities are everywhere.
Make everything as hard as possible. Resist every demand. Refuse entry without a warrant. Don’t take the buyout. Their problem solving skills are 📉
I had no idea that I would get a burst of motivation after reading this @bandcamp.com article about @doseone.bsky.social , but here I am sciencing on a Saturday daily.bandcamp.com/features/dos...
The Resurrection of Doseone
After decades of heartbreak, loss, and reinvention, the prolific artist returns to his roots with “All Portrait, No Chorus”—a fearless reminder of hip-hop's boundless potential.
daily.bandcamp.com
January 18, 2025 at 6:40 PM
I had no idea that I would get a burst of motivation after reading this @bandcamp.com article about @doseone.bsky.social , but here I am sciencing on a Saturday daily.bandcamp.com/features/dos...
Wow, I was not expecting a release from @doseone.bsky.social! This album is a incredible
doseone.bandcamp.com/album/all-po...
doseone.bandcamp.com/album/all-po...
All Portrait, No Chorus, by doseone & Steel Tipped Dove
14 track album
doseone.bandcamp.com
January 11, 2025 at 4:42 PM
Wow, I was not expecting a release from @doseone.bsky.social! This album is a incredible
doseone.bandcamp.com/album/all-po...
doseone.bandcamp.com/album/all-po...
Reposted by Johnny Felt
Kings 129, Warriors 99: Monk and Sabonis lead the way to a decisive victory
Kings 129, Warriors 99: Monk and Sabonis lead the way to a decisive victory - The Kings Herald
The Sacramento Kings traveled down I-5 to visit the Golden State Warriors and (I apologize for being a little crass but this is the only appropriate way to express this) the Kings kicked Golden State’s...
kingsherald.com
January 6, 2025 at 5:18 AM
Kings 129, Warriors 99: Monk and Sabonis lead the way to a decisive victory
Oliver wanted to let @quantitude.bsky.social know that it’s been 5 years since Jiffy first appeared on the podcast. Happy Birthday, Jiffy!
December 16, 2024 at 3:24 PM
Oliver wanted to let @quantitude.bsky.social know that it’s been 5 years since Jiffy first appeared on the podcast. Happy Birthday, Jiffy!
This is a great write up of some really cool work that some of my colleagues in the Center for Healthy Aging at Penn State (and beyond) recently published including @leb112358.bsky.social!
Everyday physical activity, even light movement, improves cognitive processing speed, equivalent to reversing four years of cognitive aging. This highlights the short-term brain benefits of staying active. #CognitiveHealth #PhysicalActivity #BrainHealth #MentalWellness #HealthyLiving
Short daily walks may reverse cognitive aging by four years, study finds
Everyday physical activity, even light movement, improves cognitive processing speed, equivalent to reversing four years of cognitive aging. This highlights the short-term brain benefits of staying active.
www.psypost.org
December 6, 2024 at 8:37 PM
This is a great write up of some really cool work that some of my colleagues in the Center for Healthy Aging at Penn State (and beyond) recently published including @leb112358.bsky.social!
Reposted by Johnny Felt
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....
Reposted by Johnny Felt
Enjoy this pack of #Data Ladies to help diversify your feeds a smidge 😉
It is quite bare bones at the moment but I'll continue to curate over the coming days ✨
go.bsky.app/5388qNY
It is quite bare bones at the moment but I'll continue to curate over the coming days ✨
go.bsky.app/5388qNY
October 28, 2024 at 10:56 PM
Enjoy this pack of #Data Ladies to help diversify your feeds a smidge 😉
It is quite bare bones at the moment but I'll continue to curate over the coming days ✨
go.bsky.app/5388qNY
It is quite bare bones at the moment but I'll continue to curate over the coming days ✨
go.bsky.app/5388qNY
Reposted by Johnny Felt
My fav starter packs so far, a thread:
stats: go.bsky.app/Ki7PjpS
stats: go.bsky.app/7TBN5rX
causal inference: go.bsky.app/FdemGAZ
package devs: go.bsky.app/N1569Qh
data peeps: go.bsky.app/8TdEfdK
medical stats: go.bsky.app/ArqEz36
bioinformatics: go.bsky.app/Ha64Gmv
r-ladies: go.bsky.app/Vgxwa2F
stats: go.bsky.app/Ki7PjpS
stats: go.bsky.app/7TBN5rX
causal inference: go.bsky.app/FdemGAZ
package devs: go.bsky.app/N1569Qh
data peeps: go.bsky.app/8TdEfdK
medical stats: go.bsky.app/ArqEz36
bioinformatics: go.bsky.app/Ha64Gmv
r-ladies: go.bsky.app/Vgxwa2F
October 26, 2024 at 7:23 PM
My fav starter packs so far, a thread:
stats: go.bsky.app/Ki7PjpS
stats: go.bsky.app/7TBN5rX
causal inference: go.bsky.app/FdemGAZ
package devs: go.bsky.app/N1569Qh
data peeps: go.bsky.app/8TdEfdK
medical stats: go.bsky.app/ArqEz36
bioinformatics: go.bsky.app/Ha64Gmv
r-ladies: go.bsky.app/Vgxwa2F
stats: go.bsky.app/Ki7PjpS
stats: go.bsky.app/7TBN5rX
causal inference: go.bsky.app/FdemGAZ
package devs: go.bsky.app/N1569Qh
data peeps: go.bsky.app/8TdEfdK
medical stats: go.bsky.app/ArqEz36
bioinformatics: go.bsky.app/Ha64Gmv
r-ladies: go.bsky.app/Vgxwa2F
Reposted by Johnny Felt
I made an attempt at a bsky psychometrics starter pack with people who work on or largely with psychometric tools! Please reskeet and (selfl!)nominate to help me fill my many and varied blind spots and make this a useful and balanced resource #rstats #psychometrics go.bsky.app/6oGLp7D
September 19, 2024 at 7:59 AM
I made an attempt at a bsky psychometrics starter pack with people who work on or largely with psychometric tools! Please reskeet and (selfl!)nominate to help me fill my many and varied blind spots and make this a useful and balanced resource #rstats #psychometrics go.bsky.app/6oGLp7D
Reposted by Johnny Felt
Starter pack for EMA, ESM, and Intensive Longitudinal Researchers.
Feel free to share, follow, and nominate. Suggestions welcome!
go.bsky.app/LzqJoUX
#ESM #EMA #AA #IntensiveLongitudinalResearch
Feel free to share, follow, and nominate. Suggestions welcome!
go.bsky.app/LzqJoUX
#ESM #EMA #AA #IntensiveLongitudinalResearch
October 24, 2024 at 10:09 AM
Starter pack for EMA, ESM, and Intensive Longitudinal Researchers.
Feel free to share, follow, and nominate. Suggestions welcome!
go.bsky.app/LzqJoUX
#ESM #EMA #AA #IntensiveLongitudinalResearch
Feel free to share, follow, and nominate. Suggestions welcome!
go.bsky.app/LzqJoUX
#ESM #EMA #AA #IntensiveLongitudinalResearch
Check out the new paper for my research group using causal inference techniques to examine the impact of contamination bias in child maltreatment research acamh.onlinelibrary.wiley.com/doi/10.1111/...
April 20, 2024 at 3:16 AM
Check out the new paper for my research group using causal inference techniques to examine the impact of contamination bias in child maltreatment research acamh.onlinelibrary.wiley.com/doi/10.1111/...
New paper: journals.sagepub.com/doi/pdf/10.1... This was a study I helped with that highlights a little known issue in child maltreatment research. Contamination bias can impact findings when children recruited for the non-maltreated control are or become maltreated during the course of the study
December 31, 2023 at 5:52 PM
New paper: journals.sagepub.com/doi/pdf/10.1... This was a study I helped with that highlights a little known issue in child maltreatment research. Contamination bias can impact findings when children recruited for the non-maltreated control are or become maltreated during the course of the study
Honey, I overfit the kids
honey, i multiply imputed the kids
honey, i partially pooled the kids
November 30, 2023 at 4:47 AM
Honey, I overfit the kids