Xing Zhang

[NBER @nberpubs]

The first results on the prevalence of A/B testing across the economy and evidence that it is correlated with tail outcomes, with newer firms failing fast, and older firms scaling rapidly, from @orgRem, Sharique Hasan, and Aaron Chatterji https://t.co/mkJUNjUp34

[Chicago Booth Review @chicagoboothrev]

Why the power of TV advertising has been overstated -https://t.co/G0fmPAi819

[Devin Pope @Devin_G_Pope]

Haha. Yes, getting left-digit bias (aka 99-cent pricing) wrong is a great example of behavioral firms. The pic I took below is one of my favorite examples.

[Shengyi Wang @txyyss]

原来夏普在 1978 到 1985 年间还出过这种“计算器-算盘”混搭，英文叫 Digicus。仿佛看到了进化论中的过渡化石……

[José Morales @jmrlsz]

I just published an #rdatatable article about .SD here: https://t.co/s0PG1AQGEd. Hope it's useful and any feedback is welcome.

[LEI @TheMarketMemo]

The longest bullmarket ever～

[Mara Averick @dataandme]

One of the benefits of reading docs is learning how the code is meant to be read, e.g. param names!
SD = Subset of Data
From @arun_sriniv's "The #rdatatable package for fast, flexible and memory efficient data wrangling" https://t.co/yagUnpktAC #rstats
/* 🖍 mine */

[Justin Wolfers @JustinWolfers]

Microeconomic decisions create macroeconomic phenomena...

[Mara Averick @dataandme]

♻ Quick intro to DAGs for causal inference…
🤔 '"Correlation is not causation". So what is?' by Iyar Lin
https://t.co/SZM5i5C7eb #rstats

[Mara Averick @dataandme]

🗂 Handy guide to {flextable} for R Markdown!
📄 "flextable overview" by @DavidGohel
https://t.co/YqXp8GHVMx #rstats #rmarkdown

[R-Ladies Newcastle @RLadiesNCL]

Are you new to R and @rstudio? Check out this amazing analogy by one of our organisers, @JKRWard - linking the different windows to cooking
📜🥔🥦🥚🍳➡️🍲
#rstats #rladies #pastryRchy

[Chicago Booth Review @chicagoboothrev]

Why long lines can be good for shoppers, and business. https://t.co/VufBIRXGUV

[Randy Olson @randal_olson]

The economics of a typical cup of #coffee. #dataviz

https://t.co/u2zFWyfWKJ

[Mara Averick @dataandme]

🌳 @AchimZeileis & co use a random forest ensemble learner for probabilistic forecasts…
⚽️ "Hybrid Machine Learning Forecasts for the 2019 FIFA Women's World Cup" post: https://t.co/9MXKVegaoB #sportsanalytics #forecasting
working paper: https://t.co/ZLB3w4NohO

[rebecca jennings @rebexxxxa]

i interviewed a professional brand namer (!!!) who told me the following facts:

- companies are naming stuff based on how they sound on PODCASTS
- its BAD to be "the Kleenex of X"
- the japanese retail brand Rakuten means the C-WORD in norweigian https://t.co/KF3PA9W3BN

[Dan Quintana @dsquintana]

I think cover letters for manuscript submissions are more important than many people think.

Here’s how I approach mine, from my (limited) experience as an author and associate editor.

[Lionel Page @page_eco]

This visual proof makes this equality so intuitive and easier to remember.

by @MagicPi2

[Jonas K. Lindeløv @jonaslindeloev]

I've made this cheat sheet and I think it's important. Most stats 101 tests are simple linear models - including "non-parametric" tests. It's so simple we should only teach regression. Avoid confusing students with a zoo of named tests. https://t.co/9PFR1ly3lW 1/n