If your meaning Standard Deviation, then think of races when you have assessed a race an find when you average all the runners StdD an this average is in the top 3rd percentile group (because its high or Wide) of all your past races you know you can go deep with all your wagers as this will be a volatile race.

Or not having to study videos to see which runners suffered interference because you can see by its StDev how tight it behaves and in what situations it becomes stable...

Its application is only limited by our thinking

plus there are more on the wagering side of the coin..