"Calculating the percentage of Pokemon in each generation with certain eye shapes -- is there a difference?"

A few days there was a thread about how Pokemon eye shape has changed through the generations. It was an interesting topic, and I decided to do some calculations to find out if certain eye shapes really are more or less common in certain generations.Also, because there was some speculation that certain eye shapes were more or less common with certain evolutionary stages (rather than generations), I did those calculations too.—I started by writing down specific details about the eye shape of each Pokemon, and then I broke those down into 9 distinct categories:0) Uncategorizable OR Multiple eye shapes (ex: Exeggutor, Claydol, Gigalith)1) Rounded top and flat bottom (ex: Charmander, Seviper, Vivillon)2) Triangle shape (ex: Charmeleon, Nuzleaf, Silvally)3) Flat top and rounded bottom (ex: Venusaur, Slakoth, Swadloon)4) Quadrilateral/Square shape (ex: Spearow, Diggersby, Charjabug)5) Perfectly round shape (ex: Pikachu, Cryogonal, Drampa)6) Tall oval shape (ex: Shinx, Uxie, Froakie)7) Wide oval shape (ex: Psyduck, Baltoy, Stunfisk)8) No visible eyes OR Closed eyes (ex: Snorlax, Ralts, Bronzong)—Specifically, I hoped to measure if there is a significant difference between the percentage of Pokemon with eye shapes 2 and 6, dependent upon generation and/or evolutionary stage.TL;DR:When broken down by the total number of Pokemon introduced in each generation, basic (12.58%) and stage 1 Pokemon (17.88%) with eye shape 2 are significantly more common in generation 1 than in later generations. Stage 2 Pokemon with eye shape 2 are only 0.36% more common in generation 1 (5.30%) than in the generation 7, which has the next highest percentage (4.94%). Among all generations, eye shape 6 is significantly more common in later generations than in generation 1, but this difference is only significant in regards to basic Pokemon. The difference shrinks to insignificant levels when observing later evolutionary stages.When broken down by the total number of Pokemon introduced in each generation that belong to each evolutionary stage, basic (27.94%) and stage 1 Pokemon (42.19%) with eye shape 2 are significantly more common in generation 1 than in later generations. The difference in the percentage of stage 2 Pokemon with eye shape 2 is also significant when comparing generation 1 to any generation EXCEPT generation 7. Stage 2 Pokemon with eye shape 2 are 2.33% more common in generation 7 (44.44%) than in generation 1 (42.11%). Among all evolutionary stages, eye shape 6 is significantly more common in later generations than in generation 1.TL;DR: TL;DR:It appears that there is a difference between the percentage of Pokemon with eye shapes 2 and 6, and this difference is primarily dependent upon generation rather than evolutionary stage.—Here’s a link to the excel spreadsheet, as well as an imgur album with pictures of the data. This data is by no means perfect, and any feedback is greatly appreciated!For the sake of this data, mega evolutions, alternate forms (except for Hoopa Unbound), and regional variants are ignored.Charts A through D include measurements made within generations, and E through H include measurements made between generations.Special notes: The numbers in red are 72+1 because of Hoopa Unbound. The numbers in blue are 300% because the total for each of the 3 evolutionary stages is 100%.—Observations:A: How many/what percent of Pokemon in each generation fall into each eye shape category?Generation 1: Eye shape 2 is the most common.Generation 2: Eye shape 5 is the most common.Generation 3: Eye shape 3 is the most common.Generation 4: Eye shape 3 is the most common.Generation 5: Eye shape 6 is the most common.Generation 6: Eye shapes 3 and 6 are the most common.Generation 7: Eye shape 6 is the most common.B and F: How many/what percent of Pokemon in each generation belong to each evolutionary stage?Generation 5 has the highest number of basic Pokemon, but generation 7 has the highest percentage of basic Pokemon.Generation 1 has the highest number and percentage of stage 1 Pokemon.Generation 4 has the highest number and percentage of stage 2 Pokemon.C: How many/what percent of Pokemon that belong to each evolutionary stage in each generation fall into each eye shape category, when broken down by the total number of Pokemon introduced in each generation?Generation 1: Stage 1 Pokemon with eye shape 2 are the most common.Generation 2: Basic Pokemon with eye shape 5 are the most common.Generation 3: Basic Pokemon with eye shape 5 and stage 1 Pokemon with eye shape 3 are the most common.Generation 4: Basic Pokemon with eye shape 6 are the most common.Generation 5: Basic Pokemon with eye shape 6 are the most common.Generation 6: Basic Pokemon with eye shape 6 are the most common.Generation 7: Basic Pokemon with eye shape 6 are the most common.D: How many/what percent of Pokemon that belong to each evolutionary stage fall into each eye shape category, when broken down by the total number of Pokemon introduced in each generation that belong to each evolutionary stage?Generation 1: Eye shape 2 is most common among all evolutionary stages.Generation 2: Eye shape 5 is most common among all evolutionary stages.Generation 3: Eye shape 5 is most common among basic Pokemon. Eye shape 3 is most common among stage 1 and stage 2 Pokemon.Generation 4: Eye shape 6 is most common among basic Pokemon. Eye shape 3 is most common among stage 1 and stage 2 Pokemon.Generation 5: Eye shape 6 is most common among basic Pokemon. Eye shape 3 is most common among stage 1 and stage 2 Pokemon.Generation 6: Eye shape 6 is most common among basic Pokemon. Eye shape 3 is most common among stage 1 and stage 2 Pokemon.Generation 7: Eye shape 6 is most common among basic Pokemon. Eye shapes 3 and 6 are most common among stage 1 Pokemon. Eye shape 2 is most common among stage 2 Pokemon.E: What percent of Pokemon fall into each eye shape category?Eye shape 0 is most common in generation 7. Eye shape 1 is most common in generation 2. Eye shape 2 is most common in generation 1. Eye shape 3 is most common in generation 4. Eye shape 4 is most common in generation 6. Eye shape 5 is most common in generation 2. Eye shape 6 is most common in generation 5. Eye shape 7 is most common in both generations 3 and 7. Eye shape 8 is most common in generation 7.G: What percent of Pokemon that belong to each evolutionary stage fall into each eye shape category, when broken down by the total number of Pokemon introduced in each generation?Eye shape 0: Basic Pokemon are most common in generation 7. Stage 1 Pokemon are most common in generation 3. Stage 2 Pokemon are most common in generation 4.Eye shape 1: All evolutionary stages are most common in generation 2.Eye shape 2: All evolutionary stages are most common in generation 1.Eye shape 3: Basic Pokemon are most common in generation 7. Stage 1 and stage 2 Pokemon are most common in generation 4.Eye shape 4: Basic Pokemon are most common in generation 5. Stage 1 Pokemon are most common in generation 6. Stage 2 Pokemon are most common in generation 7.Eye shape 5: Basic Pokemon are most common in generation 2. Stage 1 Pokemon are most common in generation 3. Stage 2 Pokemon are most common in generation 2.Eye shape 6: Basic Pokemon are most common in generation 4. Stage 1 and stage 2 Pokemon are most common in generation 5.Eye shape 7: Basic Pokemon are most common in generation 3. Stage 1 Pokemon are most common in generation 6. Stage 2 Pokemon are most common in generation 5.Eye shape 8: Basic Pokemon are most common in generation 3. Stage 1 Pokemon are most common in generation 2. There are no Stage 2 Pokemon with eye shape 8.H: What percent of Pokemon that belong to each evolutionary stage fall into each eye shape category, when broken down by the total number of Pokemon introduced in each generation that belong to each evolutionary stage?Eye shape 0: Basic Pokemon are most common in generation 7. Stage 1 Pokemon are most common in generation 3. Stage 2 Pokemon are most common in generation 4.Eye shape 1: Basic Pokemon are most common in generation 1. Stage 1 and stage 2 Pokemon are most common in generation 2.Eye shape 2: Basic and stage 1 Pokemon are most common in generation 1. Stage 2 Pokemon are most common in generation 7.Eye shape 3: Basic Pokemon are most common in generation 7. Stage 1 and stage 2 Pokemon are most common in generation 4.Eye shape 4: Basic Pokemon are most common in generation 5. Stage 1 Pokemon are most common in generation 6. Stage 2 Pokemon are most common in generation 7.Eye shape 5: All evolutionary stages are most common in generation 2.Eye shape 6: Basic Pokemon are most common in generation 4. Stage 1 Pokemon are most common in generations 5 and 7. Stage 2 Pokemon are most common in generation 5.Eye shape 7: Basic Pokemon are most common in generation 1. Stage 1 and stage 2 Pokemon are most common in generation 7.Eye shape 8: Basic Pokemon are most common in generation 3. Stage 1 Pokemon are most common in generation 7. There are no Stage 2 Pokemon with eye shape 8.—Special thanks to /u/Zifendale. Their Pokedex excel spreadsheet saved me a lot of time when I was making this!EDIT: formatting via /r/pokemon http://ift.tt/2owQMNx