Well spotted, will modify

Here's their definition of school shooting:

when a gun is brandished, is fired, or a bullet hits school property for any reason, regardless of the number of victims, time, or day of the week

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My fiancee really doesn’t understand why I want to plan to have our child earlier in the year. I seen the effects first hand playing competitive sports at a young age.

The pipes you use on the bottom right are capital letter (i/I). It came up as a serif font for me and made it difficult to understand what the graphic was saying. Use pipes instead ||

Sorry but this is not a good nor beautiful visualization, if you need a "How to read?" paragraph for your visualization to make any sense, you could improve your visualization.

How are you defining "Europe"?

If you mean the EU it didn't exist back when this graph started although arguably it's predecessor did in a very different form. More countries have since joined and one, notably, has left.

If you mean the continent there are parts of it where we simply don't have records because the countries themselves have changed a lot, are generally unhelpful or flat out lie (cough Russia cough), and the boundaries themselves are open to interpretation.

Thank god something I can show my fiancée. She really doesn’t understand it. I by no means need to have my next child in January but I just won’t plan to have a late year baby.. for girls it’s not much of an issue, but it makes a difference for boys early in life and sports.

It might be more complicated but I’d be curious to see this data adjusted to ‘month of the school year’ rather than calendar year.

IE in the UK, a September birthday would be listed as a ‘month 1’ as it’s the first month in our school calendar, and how age for this sort of thing is calculated. I think varying school start dates by country explains a few of these random peaks, but it’s hard to be sure.

September also is a months in which many births occur in Europe because 9 month earlier is December when people spend much time with their partners and indoor activities are more popular than outdoor activities.

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Whoops, thought it was by market cap. Also, I said 2x, not 3x

Can be! Or randomness.

I was born in March and am still shitty at everything.

I assume that September spike is the places in eg Europe that group on school year for youth games?

Yes, and between countries. But I thought I would just do something simple here (most countries probably use January 1 as the cutoff), and I think the fact that it shows up despite the coarse analysis shows the importance of the phenomenon.

If I’d find such data I’d do it but I haven’t had the chance to find it yet

The relative age effect is documented in a wide range of sports and also in academics. A child born in January will be 11 months older than a child born in December the same calendar year, which is a big relative difference at young ages. If coaches don't think of this, they will misperceive the older kid as being more mature and talented, and will then encourage the older kid more.

I took data on all players in the FIFA World Cup and checked their birth month. Just as expected, the most common months to be born are January, February and March.

Some countries may have other cutoff dates for starting school or sports teams than January 1, but despite this, the effect shines through.

Made in R using the ggplot2 package. Data from fbref.com.

Really it has to do when the birthday cut off is for the sport. It differs for baseball, hockey, and soccer.

Now make one for the whole of Europe in the same time range

Yes I had the same feeling making it. But I decided if it raises awareness then it’s supposed to be okay. But for sure a grim topic

I kind of hate myself for thinking this looks cool

Added to comment now. In this case interactivity is only hovering over events for details. Not my most interactive visual but I wanted it simple and effective

Delta’s highest ever revenue was $47B in 2019. That’s a third higher vice three times.

Passengers or miles flown might be a better metric. Given the lower prices outside US