Equestrian Demographics | Part One: Observations · 10:54pm Dec 1st, 2018
So, how did I spend my week? Did I write several thousand words? Did I move bookshelves so the library could be repainted? Did I finish sewing a dress and begin an embroidered Gorgoneion?
Well, yes, I did do all of those. But I also went through this remarkably obsessive list of every pony who appears in every episode of FiM, and analyzed the data I collected from that.
So let's go through the numbers, shall we? (Unless noted otherwise, the numbers used are the ratio of mares to stallions.)
Observations
First and foremost, let's discuss overall trends. There are a total of 1984 ponies represented in this study. Of those, there are 1196 earth ponies, 419 unicorns, and 369 pegasi. On an overall scale, there are 1.267 mares for every stallion. However, these numbers are slightly more interesting than that. For one thing, among children, the ratio is 2.114 while among adults, the numbers reveal a population ratio of 1.194.
Further complicating the issue is the existence of the three different types of pony.
Let's discuss the unicorns. 419 unicorns are represented in this study. The overall ratio among unicorns is 1.602—slightly higher than the overall average. Further dividing these groups, among children the ratio becomes 2.400 and 1.550 among adults. 
Next, the pegasi. Pegasi are, overall, the least populous group, representing only 19% of the total population. They also have the highest ratios of mares to stallions. Overall, there are 1.795 pegasus mares for every pegasus stallion. Among children the ratio is 2.769, and is 1.689 among adults. 
Finally, the most populous group, the earth ponies. Among the earth ponies, the sex ratio most closely resembles humans, with an overall ratio of 1.055. Among children, the ratio is 1.872, while among adults the ratio drops all the way to 0.983. 
Why is the sex ratio so much higher among children? Why is it so low among earth ponies? Why are there so few pegasi and unicorns? All these questions and more will be addressed in Part Two: Hypotheses.
