The Trend Strength indicator compares price to simple moving averages (SMAs) of different lengths (10 days, 20 days, etc.) to determine the trend a tool first tested in the August 2005 issue of Active Trader. This test features a new Trend Strength indicator that compares different moving- average values to each other instead and assigns a value between -1 (strong downtrend) and +1 (strong uptrend).