Here I show the relationship between the MACD and Z-Score in a indicator called MAC-Z. MACD is short for moving average convergence/divergence and is in it self showing the relationship between two EMA. The Z-Score in contrast is related to Bollinger Bands and in MAC-Z the Z-score is the difference between the current price and a moving average divided by the standard deviation of price over the same time period.
MAC-Z has its best use in the short term time frames in my opinion compared to MACD. Here i show from current time of writing how effective it is.