Viewing profile — fbartos

The coins are as likely to fall on heads as on tails, so they are not biased for any of the sides. People flipping them however introduce bias due to the wobble of their tosses.

Paper showing that "Fair Coins Tend to Land on the Same Side They Started: Evidence from 350,757 Flips" circulating here a couple of years back ( https://news.ycombinator.com/item?…

We did not. However, we find it highly unlikely since everyone was incentivised to upload as much as possible, and the number of coin flips determined the order of the manuscript. …

Yes, there is indeed a lot of heterogeneity in the bias between flippers and we are going to put more emphasis on it in an upcoming revision. However, it's hard to tell whether the…

> In each sequence, people randomly (or according to an algorithm) selected a starting position (heads-up or tails-up) of the first coin flip, flipped the coin, caught it in their …

Hi, I'm the first author of the manuscript, so I thought I could answer some of the questions and clarify some issues (all details are in the manuscript, but who has the time to re…

Yes, I mentioned that in the original paper but it got eddited for some reason.

It's not about the number of rotations at all. I doubt that you can control it at all even after dozens of hours coin flipping (I did more than 20h and I can't eveb guess how many …

That's actually not completelly accurate. The study protocol ( https://osf.io/hkv8p ) describes the procedure in greater detail. People were pressing one button for heads and anoth…

I personally did 20,100 flips and I can assure you I have no clue how to control the flip. I centrally got much better at flipping and catching the coin in hand without dropping it…

There was indeed a lot of variation in the height of the tosses. I however disagree with the conclussion: two of my friends at the video had the most different height of tosses (on…

You are absolutely right :)

We told people that the coin has to flip at least once (which would bias it for the opposite site). Whenever instructing people, I tried to explaining that the coin flip should loo…

Not neccessarily because spinning and bouncing coins are often much more biased then flipped coins. (Unequal weight distribution on the side can bias a spinned coin while it doesn …

About a year ago, we embarked on a quest to answer one of the most intriguing questions: If you flip a fair coin and catch it in hand, what's the probability it lands on the same s…

Have you ever tossed a coin to settle a bet and wondered which side to choose? Diaconis (https://doi.org/10.1137/S0036144504446436) proposed model predicting ~1% bias in favor of t…

Hi all, I'm one of the authors of the reply and it was very interesting reading so many diverse thoughts and comments. I would love to respond to all of them, but it would take age…