Greater the value is, the more favourable is the curve.
All data here is sourced from Score Calculator,
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I defined difficulty as sum of curve's score from 0 to 9 mistakes. To get meaningful numbers, difficulties are presented as a relative values, where 0 is the easiest test (curve falls off quicker, you get more punished for mistakes) and 1 is the hardest (curve falls off slower, you get less punnished for mistakes).
For each test, for each of the 3 sections difficulty is calculated separatly. Every test also has a total difficulty, which is the average of them.
TL;DR: Downward trend means good scores are getting harder to get, upward trend means good scores are becoming easier to obtain.
For each test, for each of the 3 sections difficulty is calculated separatly. Every test also has a total difficulty, which is the average of them.
TL;DR: Downward trend means good scores are getting harder to get, upward trend means good scores are becoming easier to obtain.