Prosper responded to my e-mail request for an ROI today, so I decided to update my Excel spreadsheet for the first time in a year to get an XIRR to compare.
I thought if a few people post their ROIs from the various sources in the same thread, we might get a good sample of the accuracy of each. For me, both Prosper and lendstats were close; Erics overestimated by more than 100 basis points.
4.09%, $68.84 in active notes - Excel XIRR (subtracted entire principal value of all lates)
3.98%, 891 day avg age - Prosper
5.14%, 1372 day avg age - ericscc.com
3.88%, 35.8 months - lendstats.com