Hi,

a graph like this would be really interesting I think...but it sounds expensive? It came to my mind because I get the feeling, that my retention rate for a short timespan ist better than for several weeks...my mnemonics tend to fade out then...

or, alternatively, the due percentage on the x axis

We haven't set anything like that up for automatic viewing, but a Skritter user did help us by writing some scripts to analyze that data offline. I'll see if we can get those running again and let you know some interesting bits about your data.