I assume this would be wouldn't be too hard to calculate with a proper database, but does anyone know the number of unique characters/morphemes used in the 5000, 10000, 30000, etc. most common words?
For example, I heard that 6000 characters covers over 99% of words in modern usage, and assuming that a native's passive vocabulary is around 30000, I conclude that there are approximately 6000 unique characters used in the 30000 most common words (this could be way off).
I am curious about these statistics. Preferably, someone has a nice plot showing the relationship between the two, but a few data points would also be appreciated.