what is the negative directional indicator di 
the negative directional indicator di measures the presence of a downtrend and is part of the average directional index adx if di is sloping upward it s a sign that the price downtrend is getting stronger this indicator is nearly always plotted along with the positive directional indicator di image by sabrina jiang investopedia 2021the formula for the negative directional indicator di is di s dm atr where dm negative directional movement dm prior low current low s dm smoothed dm s dm t t 1 4 t dm t t 1 4 t dm 1 4 current dm atr average true range begin aligned text di frac text s dm text atr textbf where text dm text negative directional movement phantom text dm text prior low text current low text s dm text smoothed dm phantom text s dm sum t t 14 t text dm left frac sum t t 14 t text dm 14 right text current dm text atr text average true range end aligned di atrs dm where dm negative directional movement dm prior low current lows dm smoothed dms dm t t 14 t dm 14 t t 14t dm current dmatr average true range 