SAD - ATR with a utility tune-up.
Similar to ATR, SAD finds the true range of an asset. Unlike ATR, which is a rolling indicator, SAD is session based, simliar to VWAP. This gives it a great advantage over a regular ATR, where one must determine if their ATR level is statistically significant or not. SAD makes it easy for you to analyze statistical anomalies...
Amplitude is a very simple measurement of subtracting the range (high - low) of a candle by some other data from that candle. in this case, we use the midpoint of the candle, so the calculation is (high - low) / (high + low)/2 . This isn't a new concept, but I could not find this study anywhere so I decided to add it myself.