How does it work exactly? Is it daily? Is it percentage compared to other players?
For example my overall skill radar shows:
93 winrate (which is ~60%for that day)
82 survived (~36% for the day)
114 damage assisted 5848 total / 162 per game for the day)
26 damage dealt which was 14394 total / 399 per game for the day
77 accuracy which is ~59 (for the day)
61 efficiency which is ~ 1269 (WN7 for the day)
Skillradar shows the percentage compared to the average (100%). So if you have a skill of 93% you are losing too much. 114% damage assisted means you are assisting 14% above the average.
The data is for all time, not only today.