So, several people pointed out that this table is very weird, and I agree It's hard to see how these values are ~possible~, given the p-value beneathhttps://twitter.com/GidMK/status/1213944606510866432 …
Epidemiologist. Writer (Guardian, Observer etc). "Well known research trouble-maker". PhDing at @UoW Host of @senscipod Email gidmk.healthnerd@gmail.com he/him
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
Add this Tweet to your website by copying the code below. Learn more
Add this video to your website by copying the code below. Learn more
By embedding Twitter content in your website or app, you are agreeing to the Twitter Developer Agreement and Developer Policy.
| Country | Code | For customers of |
|---|---|---|
| United States | 40404 | (any) |
| Canada | 21212 | (any) |
| United Kingdom | 86444 | Vodafone, Orange, 3, O2 |
| Brazil | 40404 | Nextel, TIM |
| Haiti | 40404 | Digicel, Voila |
| Ireland | 51210 | Vodafone, O2 |
| India | 53000 | Bharti Airtel, Videocon, Reliance |
| Indonesia | 89887 | AXIS, 3, Telkomsel, Indosat, XL Axiata |
| Italy | 4880804 | Wind |
| 3424486444 | Vodafone | |
| » See SMS short codes for other countries | ||
This timeline is where you’ll spend most of your time, getting instant updates about what matters to you.
Hover over the profile pic and click the Following button to unfollow any account.
When you see a Tweet you love, tap the heart — it lets the person who wrote it know you shared the love.
The fastest way to share someone else’s Tweet with your followers is with a Retweet. Tap the icon to send it instantly.
Add your thoughts about any Tweet with a Reply. Find a topic you’re passionate about, and jump right in.
Get instant insight into what people are talking about now.
Follow more accounts to get instant updates about topics you care about.
See the latest conversations about any topic instantly.
Catch up instantly on the best stories happening as they unfold.
Health Nerd Retweeted Health Nerd
So, several people pointed out that this table is very weird, and I agree It's hard to see how these values are ~possible~, given the p-value beneathhttps://twitter.com/GidMK/status/1213944606510866432 …
Health Nerd added,
Have another gander at those numbers The means are a ~tiny~ bit different, but the quartiles are virtually identical! The medians are exactly the same
And the test that the p-value comes from is actually a Wilcoxon signed-rank test, which compares DISTRIBUTIONS, not mean values In other words, it's VERY unlikely you'd see two samples with the same medians, virtually identical quartiles, but a p of 0.022pic.twitter.com/bTLVXJ6CsF
How unlikely? Well, I thought I'd give it a quick test (using Stata 15) Here's the codepic.twitter.com/rwqwm2qo3H
Basically, I'm generating two variables with the correct quartiles, where all numbers are random between those two I also skewed the numbers slightly up (making before higher and after lower) because...well, you'll see
The code runs for 100,000 iterations, then dumps it all into the file I convert the z-scores into p-values, and voila! 100,000 random simulated distributions and their p-values for a Wilcoxon paired samples test
Straight away it doesn't look good. There are very few tests where we get a significant p-value randomly (129/100000)pic.twitter.com/3kmDbe4glI
Even worse, if I only look at the simulations where the means were congruent I can't find a single simulated example where the p-value is even close to 0.022!pic.twitter.com/TLJMvrI6Z6
If I rejig the code to make the before values higher still, and the after values even lower, I can get a lot more significant results but ~none~ of the means are congruentpic.twitter.com/KAnRBe75pt
I can't find a single example where those mean, median, p-value, and quartiles are all true That's...not ideal Please have a look at my code and tell me if I've made a mistake!
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.