Andriy Koval

Research analysis, Government of Alberta. Statistical modelling, data visualization, reproducible research. Views are my own.

[Andriy Koval @andkovpro]

@DC_Draino The degree of your ignorance is astounding. To the point that I think you know you are twisting the facts, but do it anyway for you political gain. Shameful.

[Andriy Koval @andkovpro]

@AndrewMNaber Wait, what? You were terminated? Am I out touch with the news or with the satire?

[Andriy Koval @andkovpro]

Goodbye, @Twitter . I hope some Nordic country resurrect you in a new incarnation.

[Margarita Zharova @margarita_hohun]

dead people, dead children, destroyed buildings are typical news in Ukraine after 24th of February. but it's extremely hard to handle it today.

it's Vynnytsya. and creating maps is literally the one thing which made me stop crying. #GenocideOfUkrainians #russiaisaterrorisstate

[Andriy Koval @andkovpro]

My hometown #Vinnytsia One of the central squares. No military object anywhere near. As of now: 23 dead, 3 of them children. 90+injured, 46 of them critically, 42 missing. All were civilians. It’s a statement of fact that #russiaisaterrorisstate

[Nina Slepkova @NinaSlepkova]

Vinnytsia, Ukraine, office center, just now. #russiaisaterrorisstate

[Andriy Koval @andkovpro]

@TimothyDSnyder , just heard you on @chrislhayes about Zelensky asking for russian words for show, bc now way he wouldn't know. My datum: As dual UA/RU speaker I can relate to Z: you often blank out, so having a person to jump in with translation is handy for high stakes comms.

[Mark D. Levine @MarkLevineNYC]

Putin's oligarchs are using Manhattan real estate as a safe haven for their assets.

Many are hiding in plain site. This needs to end. Time for these properties to be seized.
https://t.co/UKxI26j1UL

[Andriy Koval @andkovpro]

Friends, thank you for your support. You keep asking me what you can do to help. My old friends run a volunteer service delivering dairy products to military and children hospitals in Kyiv.
#StandWithUkraine️ @UCFDowntown @CIHR_IRSC @MT_FB @VanderbiltU
https://t.co/Yaf50UaBEW

[R Function A Day @rfunctionaday]

ROC curves provide a convenient way to compare responses and predictions of a binomial model.

The {performance_roc} function from {performance} 📦 computes AUC metric and visualizes ROC curves for a collection of models 🥇🥈🥉

https://t.co/ZKty2kA5Br

#rstats #DataScience

[R Function A Day @rfunctionaday]

Correctly specifying a distribution family for regression model can improve estimate accuracy. But what if we’re unsure?

The {check_distribution} function from {performance} 📦 uses Random Forest to help you reconsider the choice ⚠️

https://t.co/qD7cQvNLLz

#rstats #DataScience

[Matt Alexander, MD, MPP @mattvalexander]

Our latest in Health Policy. Drawing on our @OBShealth Covid-19 #HSRM work, we compare Covid responses in CA, IE, UK, & US, touching on factors like governance, physical infrastructure, & workforce capacity. Honored to have worked w/ this superstar team!

https://t.co/xGQ1CQMJHH

[Måns Thulin @mansthulin]

After 15 years of using #Rstats, I finally got around to submitting a package to CRAN. https://t.co/Q46GmlPMam makes hypothesis testing using the bootstrap easier.

[Edd @eddieho717]

Discovered a nice package to output colored text to console. library(crayon) #RStats

[R Function A Day @rfunctionaday]

If you are fluent in {dplyr} and wish to learn how to write SQL queries, it can be nifty to have a function that can provide a syntax translation between the two.

The {show_query} function from {dbplyr} 📦 does just that! 🔄

https://t.co/GAjWk5qfVC

#rstats #DataScience

[Meghan Hall @MeghanMHall]

I’m gearing up to teach a course at CMU on visualizing data in R with ggplot (and a bit of R Markdown, too) & am compiling a list of extra resources. If you have a top-notch favorite blog post/tutorial/etc on any ggplot-related topic (or a fun public data set!), please share! 🙏🏻

[Adam Garber @Adam_C_Garber]

What is Latent Transitions Analysis? Good question!
#LTA (typically) refers to the longitudinal extension of a latent categorical variable.
📈A Tutorial paper on Latent Transition Analysis (LTA) forthcoming. ✔️Revise & resubmit in Psych. Methods!

©️➡️©️➡️©️
#rstats #mplus

[R Function A Day @rfunctionaday]

The {ggplot2} syntax to carry out few common routines (e.g, changing legend position, axes, etc.) can be surprisingly hard to remember.

The {easy_} function family from {ggeasy} 📦  provides memorable shortcuts for such routines 🙌

https://t.co/vqFYzcvxKZ

#rstats #DataScience

[Andriy Koval @andkovpro]

@GJMerrin Wow, you’re not messing around with “the introduction” go right to “the elements”. Respect and envy!

[Andriy Koval @andkovpro]

#BlackLivesMatter May we all have strength to stay angry.

[R Function A Day @rfunctionaday]

Although a no. of 📦s help assess validity of regression model assumptions visually, only a handful cover time series analysis.

The {ggtsdiag} function from {ggfortify} 📦 provides a comprehensive diagnostic check for such models 📈

https://t.co/iJaZ6bD6e1

#rstats #DataScience