They are only representative of a part of Yatse users and not all XBMC users but yet gives some hints on what platform users use XBMC and which versions.
Quote:* Major versions
* Frodo versions
* Gotham versions
* Helix versions
Since alpha value in JSON was only fixed very recently the data is not useful and only shows that 70% of users use a version older than 1 month.
Since Rpi detection was not available in Frodo, they are split by XBMC version to avoid false values.
I previously calculated rpi ratio with armv6 in host os but it seems there's lot's more arm board than RPI or that some distribution does not set the RPI flag.