AFlickering wrote:ramynoodle wrote:The movies I gave a score of 100 to should be in the 100th percentile (≈99.67%), but it says 99th instead.
99th is the highest possible percentile because the site is calling the lowest percentile the '0th percentile'. to have percentile called 100th we'd need to get rid of the 0th (just like we had no 0th tier in the old system and went 1-10). might be a good idea, as the current way seems to be confusing people and 1-100 just generally makes more sense than 0-99 IMO, plus it's more in keeping with the previous system.
Yeah, as AFlickering says, this is all due to the fact that if you had both 0 and 100, you would end up with 101 percentiles. And if you rounded in the traditional way, the 0 and 100 "bins" would only be half as big as the other 99 bins (0 would represent the half a percent from 0.00 to 0.49, but 1 would represent the whole percent from 0.50 to 1.49, and so on).
So to get 100 bins of equal size, it seems like percentile systems usually choose to round all decimals either up or down.
A point in favor of the current 0-99 approach is that what's in front of the decimal stays the same, so 99.01% and 99.99% are both counted as 99%. I guess I slightly prefer 0-99 for that reason, but I can totally understand how 1-100 could seem more intuitive too. Either way works. And probably either way, there will still be questions from time to time...