A Study in Red
Data visualization is used - among other things - to reveal patterns in data that wouldn't otherwise be obvious. When applying this logic to Star Trek: The Original Series - "the number of fatalities by shirt color", a pattern immediately becomes obvious: it is very dangerous to wear a red shirt while working on the Enterprise.
The model you're looking at here is the Memory Alpha model, and I will be adding the Ex Astris Scientia model in the near future.
Why are there different models?
The Ex Astris Scientia calculates fatalities that are implied offscreen, whereas the Memory Alpha model does not. Feel free to visit the Google Sheet I made for both models (read only), explore both models using the tabs at the bottom of the sheet, then copy the data to your own Google Sheets document and massage the data as you see fit.
If you discover inaccuracies, please feel free to drop me a message about it!
Updated 4-30-2022 by Cameron M.
Memory Alpha
Crew Meta Information
The Statistical Percentage Theory
There is a theory that wearing a redshirt on the Enterprise is actually the safest color to wear because the pool of Redshirts is so much larger the the pool of other colors available.
According to this article at StarTrek.com, there were 430 crewmembers on the Enterprise, and theoretically 239 of them were redshirts (folks in Security, Engineering, and Operaitons).
This mean that statistically, it's actually 3.4% safer to wear a redshirt than it is to wear a goldshirt!