Method and Conclusion. See here.
Results. A ratings system was designed in terms of how difficult it would be for an English-language speaker to learn the language. In the case of English, English was judged according to how hard it would be for a non-English speaker to learn the language. Speaking, reading and writing were all considered.
Ratings: Languages are rated 1-6, easiest to hardest. 1 = easiest, 2 = moderately easy to average, 3 = average to moderately difficult, 4 = very difficult, 5 = extremely difficult, 6 = most difficult of all. Ratings are impressionistic.
Time needed. Time needed for an English language speaker to learn the language “reasonably well”: Level 1 languages = 3 months-1 year. Level 2 languages = 6 months-1 year. Level 3 languages = 1-2 years. Level 4 languages = 2 years. Level 5 languages = 3-4 years, but some may take longer. Level 6 languages = more than 4 years.
Yuchi is a language isolate spoken in the Southern US. They were originally located in Eastern Tennessee and were part of the Creek Confederacy at one time. Yuchi is nearly extinct, with only five remaining speakers.
Yuchi has noun genders or classes based on three distinctions of position: standing, sitting or lying. All nouns are either standing, sitting or lying. Trees are standing, and rivers are lying, for instance. If it is taller than it is wide, it is standing. If it is wider than it is tall, it is lying. If it is about as about as wide as it is tall, it is sitting. All nouns fall into one of these three genders, but you can change the gender for humorous or poetic effect. A linguist once asked a group of female speakers whether a penis was standing, sitting or lying. After lots of giggles, they said the default was sitting, but you could say it was standing or lying for poetic effect.
All Yuchi pronouns must make a distinction between age (older or younger than the speaker) and ethnicity (Yuchi or non-Yuchi).
Yuchi gets a 6 rating, hardest of all.