Pravesh Parekh
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parekhpravesh.bsky.social
Pravesh Parekh
@parekhpravesh.bsky.social
120 followers 260 following 13 posts
Postdoctoral researcher | Neuroimaging | Genetics | Machine learning | Psychiatry | Progressively dystopian
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parekhpravesh.bsky.social
Pravesh Parekh @parekhpravesh.bsky.social · May 16
Introducing FEMA-Long for high-dimensional large-scale mixed-effects modelling! Includes modelling unstructured covariance, non-linear effects using splines, time-dependent effects with spline interactions, and longitudinal GWAS with time-dependent genetic effects!
www.biorxiv.org/content/10.1...
FEMA-Long: Modeling unstructured covariances for discovery of time-dependent effects in large-scale longitudinal datasets
Linear mixed-effects (LME) models are commonly used for analyzing longitudinal data. However, most applications of LME models rely on random intercepts or simple, e.g., stationary, covariance. Here, w...
www.biorxiv.org
parekhpravesh.bsky.social
Motion Insensitive Resting-State Analysis (MIRA): a new way to perform motion correction that effectively removes the confounding effect of motion on the rsfMRI derived correlation matrices! Meet me at poster F13 and at the flash talk session today at #Flux2025 to find out more about this!
September 5, 2025 at 6:14 AM
Reposted by Pravesh Parekh
timoroettger.bsky.social
New paper out 🚨 in BMC Medical Research Methodology

We assessed the prevalence of transparency-related practices in epidemiological secondary analyses for the Norwegian mother, father, and child cohort (MoBa).

shorturl.at/604hn
Transparency in epidemiological analyses of cohort data a case study of the Norwegian mother, father, and child cohort study (MoBa) - BMC Medical Research Methodology
Background Epidemiological research is central to our understanding of health and disease. Secondary analysis of cohort data is an important tool in epidemiological research but is vulnerable to pract...
bmcmedresmethodol.biomedcentral.com
July 2, 2025 at 8:21 AM
Reposted by Pravesh Parekh
lucinauddin.bsky.social
The ABCD Study 6.0 release is finally here! 🧠 Apply for data access here @theabcdstudy.bsky.social www.nbdc-datahub.org
NBDC Data Hub
NIH Brain Development Cohorts (NBDC) Data Sharing Platform: Unifying ABCD and HBCD data management in one powerful platform.
www.nbdc-datahub.org
June 26, 2025 at 11:16 PM
parekhpravesh.bsky.social
Motion Insensitive Resting-State Analysis (MIRA): meet me at poster 1595 at #OHBM2025 to discuss a new way of performing motion correction for resting state fMRI that effectively removes the confounding effect of motion on rsfMRI derived correlation matrices!
June 26, 2025 at 11:29 PM
Reposted by Pravesh Parekh
neuromusicnerd.bsky.social
Stoked to be attending #OHBM2025 this week with our UCSD / JCVI team! If you’re here, be sure to stop by my poster to see some cool work from our lab using GAMMs:
📅 W/Th June 25th/26th
🧠 "Nonlinear age trajectories of subcortical microstructural and morphometric changes in the ABCD study"
Brisbane cityscape with the Brisbane sign in the foreground
June 24, 2025 at 11:56 PM
parekhpravesh.bsky.social
Meet me at #OHBM2025 poster 689 today/tomorrow to discuss using Fast and Efficient Mixed-Effects Algorithm (FEMA) for mixed-effects modeling with unstructured covariance and splines, perform longitudinal GWAS, and discover time-dependent genetic effects!
www.biorxiv.org/content/10.1...
www.biorxiv.org
June 24, 2025 at 11:54 PM
parekhpravesh.bsky.social
Led by the incredible @gauravbhalerao.bsky.social
imagingneurosci.bsky.social Imaging Neuroscience @imagingneurosci.bsky.social · May 30
New paper in Imaging Neuroscience by Gaurav Bhalerao, Ludovica Griffanti, et al:

Automated quality control of T1-weighted brain MRI scans for clinical research datasets: methods comparison and design of a quality prediction classifier

doi.org/10.1162/IMAG...
June 1, 2025 at 2:46 PM
Reposted by Pravesh Parekh
theabcdstudy.bsky.social
Coming June 2025! We are excited to launch the NIH Brain Development Cohorts (NBDC) Data Hub. This new data ecosystem will host & facilitate access to data from the Adolescent Brain Cognitive Development (ABCD) Study & the HEALthy Brain and Child Development (HBCD) Study.

1/13
May 22, 2025 at 3:56 PM
parekhpravesh.bsky.social
Introducing FEMA-Long for high-dimensional large-scale mixed-effects modelling! Includes modelling unstructured covariance, non-linear effects using splines, time-dependent effects with spline interactions, and longitudinal GWAS with time-dependent genetic effects!
www.biorxiv.org/content/10.1...
FEMA-Long: Modeling unstructured covariances for discovery of time-dependent effects in large-scale longitudinal datasets
Linear mixed-effects (LME) models are commonly used for analyzing longitudinal data. However, most applications of LME models rely on random intercepts or simple, e.g., stationary, covariance. Here, w...
www.biorxiv.org
May 16, 2025 at 3:22 PM
Reposted by Pravesh Parekh
lucinauddin.bsky.social
FYI, if you want to be prepared to apply for the next ABCD Study data release, prepare for these new NIST security requirements 🧠: @ohbmofficial.bsky.social abcdstudy.org/scientists/d...
Data Sharing - ABCD Study
abcdstudy.org
March 31, 2025 at 5:53 PM
Reposted by Pravesh Parekh
bbolker.bsky.social
#lirpaloof Since it's already 2025-04-01 for most of the world ... a slightly updated version of the `celebrate` package: `remotes::install_github("bbolker/bbmisc/celebrate")`. (Description: Celebrate your successes and mourn your failures.) Now supports `htest` objects!
celebrate package:celebrate R Documentation Audio 'announcements' when printing model summaries Description: The only function of this package is to augment the printing of model summaries with appropriate sound effects based on whether you have achieved the magical p<0.05 level of significance for at least one variable (not including the intercept - we have to try to be a _little_ bit sensible ...) Details: Sounds are taken from <http://freesounds.org> To set an alpha-level different from 0.05, you can specify ‘options(celebrate.alpha = <value>)’ • fanfare: user primordiality, <https://www.freesound.org/people/primordiality/sounds/78823/> (CC BY 3.0) • trombone: user kirbydx, <https://www.freesound.org/people/kirbydx/sounds/175409/> (CC0) Examples: ## Not run: m1 <- lm(speed~dist,cars) m2 <- lm(Income~Population,data.frame(state.x77)) summary(m1) summary(m2) ## chi-squared test M <- as.table(rbind(c(762, 327, 468), c(484, 239, 477))) dimnames(M) <- list(gender = c("F", "M"), party = c("Democrat","Independent", "Republican")) (Xsq <- chisq.test(M)) # Prints test summary boring <- matrix(c(6,5,4,5), nrow = 2) (chisq.test(boring)) ## End(Not run)
April 1, 2025 at 1:17 AM
Reposted by Pravesh Parekh
rmcelreath.bsky.social
Did you know that all the fine artisanal memes from my stats lectures are available in the course repo? Reuse and remixing freely encouraged github.com/rmcelreath/s...
GLMM meme: cat on left licking himself labeled GLM; tiger on right in same posture labeled GLMM this is your brain [egg] this is regression [frying pan] this is your brain on regression [egg frying in pan] any questions? elton john meme: RESULTS SECTION (left) METHODS SECTION (right) terminator meme: What's your mom's job? STATISTICIAN Is it okay to replace missing values with zeros? Sure honey that sounds fine Your foster parents are dead
March 21, 2025 at 7:37 AM
Reposted by Pravesh Parekh
f2harrell.bsky.social
Dive into stat modeling&applications, relaxing assumptions, predictive accuracy, preserving information, imputation, model validation, Bayesian models, causal specification+many controversial topics: Regression Modeling Strategies course May 15-16, 19-20 hbiostat.org/doc/rms/4day.html #StatsSky
RMS
hbiostat.org
March 9, 2025 at 5:41 PM
Reposted by Pravesh Parekh
adrianaguatame.bsky.social
A friend included this anti-acknowledgement section on her PhD thesis. She also added the proposition: “Systematic bullying and undermining of girls and women in STEM starts early on and is the reason why they do not stay in science and related fields.”
Absurd we still need to go through this
🧪👩‍🔬
There have been people less than helpful in my journey here. I wanted to acknowledge those too, bc I know I am not unique in this experience. No thank you to the physics study assoc that made me sing songs about how women couldn't study physics without sleeping with the professor, the day I stepped into university life. No thank you to the 5th year physics student that decided to assign me a stripper name within the first minute of meeting me in the physics coffee corner in my first year. No thank you to the technician that was responsible for onboarding me on the use of the cluster in my third year who raised his eyebrows and asked me if that meant I was some sort of computer girl. No thank you to the senior researcher that sent me utterly inappropriate texts after a conference, then proceeded to apologise months later by telling me they had not been meant for me anyway so no hard feelings remain hopefully And no thank you to him for attending every conference I've been to since. No thank you to the people who told me that it was surprising that I was doing a PhD since I was a girl. No thank you to the man who mistook me for a coffee lady at a conference, and after having to correct him two times that I did not work there, responded with you should consider it. No thank you to the researcher that asked me what I was wearing underneath my outfit during a conference. No thank you to the physicist who declared to a room full of other physicists that biologists don't know how to design an experiment. No thank you to the people who have called me scary instead of strong and intimidating instead of intelligent. And finally, no thank you to the exec board of the TU Delft, whose knee-jerk reaction to being held up a mirror about the social safety at the university, was to sue the party holding up the mirror instead of looking at the problems they highlighted. ... You have made me feel like I do not belong in science & I cannot forgive you for that.
March 6, 2025 at 4:40 PM
Reposted by Pravesh Parekh
imagingneuroucl.bsky.social
Happy 30th birthday year to SPM!! 🎈🍰

To get the party started, we are delighted to announce SPM 25.01, a major new version of the open-source neuroimaging software.

Read the preprint to discover what's new arxiv.org/pdf/2501.12081 and download SPM for free from Github github.com/spm/spm/rele...
arxiv.org
January 24, 2025 at 3:56 PM
Reposted by Pravesh Parekh
carolinebowen.bsky.social
REFUSE.

(lexical stress)
A notice with a buff coloured background and bold dark brown printing in capital letters, pinned to a dark grey-green coloured door. The word REFUSE is in larger print than the rest of the notice. The notice reads: REFUSE TO BE STORED IN BLACK PLASTIC SACKS AND PLACED IN THE CONTAINERS PROVIDED.
January 18, 2025 at 8:33 PM
Reposted by Pravesh Parekh
7 steps to junk science that can achieve worldly success
statmodeling.stat.columbia.edu/2025/01/17/7...
7 steps to junk science that can achieve worldly success | Statistical Modeling, Causal Inference, and Social Science
statmodeling.stat.columbia.edu
January 17, 2025 at 2:48 PM
Reposted by Pravesh Parekh
talyarkoni.com
 “people won’t take us seriously if we speak plainly about what we’re doing, so we have to smoke and mirror some fake math at them to get them to show us respect”.
March 30, 2024 at 5:45 PM
Reposted by Pravesh Parekh
carlbergstrom.com
When I was a young man there were whispered rumors among the elders that they could remember their own elders talking about a time when getting grants had been a means for doing science, rather than vice versa.
January 13, 2025 at 6:07 AM
Reposted by Pravesh Parekh
dsquintana.bsky.social
Are you an early career researcher at @uio.no? Next Wednesday at 1pm I’ll be running a career development workshop for UiO ECRs, in which I’ll cover how a “start-up of one” mindset can be used for navigating academic careers.

For more details ⬇️
The Start-Up Scholar - The Faculty of Mathematics and Natural Sciences
Join us for an interactive workshop that has been designed to help PhD candidates, Postdoctoral Fellows and Early Career Researchers plan their careers using a start-up framework.
www.mn.uio.no
January 9, 2025 at 7:05 AM
Reposted by Pravesh Parekh
npariente.bsky.social
Yearly reminder that the world will not end if you don’t submit your paper or revision before the holidays.

Editors are people too & need a break. The @plosbiology.org team in particular has done outstanding work this year & fully deserves it. We’re mostly off the next 2 weeks.

Happy holidays!
a cartoon of minnie mouse sitting at a desk holding a pencil and a cup of coffee
Alt: a cartoon of minnie mouse sitting at a desk holding a pencil and a cup of coffee
media.tenor.com
December 19, 2024 at 10:54 PM
Reposted by Pravesh Parekh
jaholkowskipiotr.bsky.social
New paper alert! Our paper 'Charting the shared genetic architecture of Alzheimer's disease, cognition, and educational attainment, and associations with brain development' is out in Neurobiology of Disease!
@SFFNORMENT

www.sciencedirect.com/science/arti...
December 17, 2024 at 1:46 PM
Reposted by Pravesh Parekh
drbreaky.bsky.social
The Brain Connectivity Workshop 2025 will be held just before #OHBM2025 on the paradise that is Minjerribah (North Stradbroke Island) a one hour ferry ride from Brisbane

Registration will open shortly (cost to be <$600 for travel registration & accomodation) so please plan your flights accordingly
December 18, 2024 at 7:19 AM
Reposted by Pravesh Parekh
juliafstrand.bsky.social
Hi all! I'm looking for a short, accessible reading for 1st year UGs that covers:
1) contributors to the replication crisis(e.g., p-hacking, publication bias, researcher degrees of freedom)
2) initiatives to address it (e.g., preregistration, sharing data and code, registered reports).

Any tips?
December 11, 2024 at 7:08 PM
Reposted by Pravesh Parekh
phdcomics.com
How long it takes...
December 7, 2024 at 12:06 AM