When the price of an asset is above the VWMA, or positive, this represents a bullish opportunity and is likely in an uptrend.
When the price of an asset is below the VWMA, or negative, this represents a bearish opportunity and is likely in a downtrend.
Calculation:
VWMA = SUMM( Price * Volume ) / SUMM( Volume )
Where:
SUMM = the sum for N periods