Statistics that would be especially useful to me would refer to unique cloze words (see end of post for what I mean by “words”):
- How many unique cloze words remain in this category?
- How many unique cloze words have I encountered (“played”) in this category?
- How many unique cloze words have I mastered in this category?
- How many unique cloze words have I encountered (“played”) overall?
- How many unique cloze words have I mastered overall?
This information would be more useful to me than how many sentences I’ve played. For instance, the Russian grammatical category “Adverbs of Place and Direction” contains 506 sentences, but only about a dozen unique cloze words (здесь, тут, там, куда, туда, сюда, откуда, оттуда, отсюда, где, and maybe one or two more). After I’ve seen every word five times or so, there’s nothing more to learn. On the sentence/category construction side (meaning Mike and whatever team is working with him), if the number of unique cloze words were used to determine how many sentences should go into a category, we could have the category sizes make more sense. On the player side, if I knew that I had already seen all the unique words in a category, I could go on to a new category. I would also love it if there were a way to prioritize sentences with cloze words I hadn’t seen before so that they would show up sooner. (Hopefully, these would be genuine words in the language, rather than unassimilated foreign names.)
Unique words would also be a good way to determine how much vocabulary I’ve been exposed to overall, if I’m looking for a way to quantify my progress. I’d much rather know that than how many sentences I’ve played or mastered.
As for how I’m defining “words”, it could mean “word forms” (where “walk”, “walks”, and “walking” would count separately) or “stemmed/lemmatized words” (where they would be treated the same). Of the two, stemmed/lemmatized would be more interesting to me, but I suspect much harder to count.