What is prediction strength?

Prediction strength is a certainty which our AI has for some particular prediction. The strength should be evaluated according to the price movement direction only. 

Thus, if, for example,  you have a prediction strength for sell order equal to 20%, that means that with the certainty of 20% the price will go down, and tells nothing about the price going down.

The analog of the prediction strength is a chemical mix: if it has 20% of a substance, it doesn’t mean that 80% of the mix doesn’t have it.