The ‘Median’ Price means half of Sold prices were lower and half were higher. The other popular measurement is the ‘Average’ Price. Using the ‘Median’ eliminates the effect of outliers on a meaningful measurement. The Momentum and the 12-month moving average (12MM), both based on the Median Price, help predict future changes and indicates possible investment actions. Momentum detects changes in the rate of change from month to month and therefore moves before the Price change is evident. The monthly Price change pulls and pushes on the Moving Average of the Price. For highly variable prices (e.g., Loomis 95650), Momentum and the MA of the Price is more difficult to translate.

The 12 Month Moving Average is a ‘trailing indicator’ of the Price that places a greater weight and significance on the most recent data points. Like all moving averages, this technical indicator is used to produce buy and sell signals based on its relation to the Price changes it is measuring. Traders often use several different EMA lengths, such as 10-day, 50-day, and 200-day moving averages. Investment analysis usually uses data with a 1-day occurrence. Real estate data, although happening daily, is reported monthly. Therefore, these calculations use the frequency of source data – monthly, therefore 12 month MA. https://www.investopedia.com/terms/e/ema.asp

Showing the Median Price and its Momentum (Þ) together makes it easier to explain how crossing the X axis “warns” the investor that the momentum is triggering a possible action. Because Momentum is not perfect, there is a time lag and, therefore, lost opportunity to either gain more or lose less from the actual peak/trough to the crossing of the X axis. https://www.investopedia.com/trading/introduction-to-momentum-trading/