The NR7 day is based on the premise that range contractions are followed by range expansions.
The screener adds other indicators to further qualify signals.
Buy on move above high of narrow range day high and Set trailing stop-loss.
//MEXITRADER SCREENER
c1= Range<Range[1] and Range<Range[2] and Range<Range[3] and Range<Range[4] and Range<Range[5] and Range<Range[6] and Range<Range[7]
c2 = high < high[1] and low > low[1]
c3 = lowest[5](CCI[20]) < -100
c4 = AroonUp[63] > AroonDown[63]
c5 = c1 and c2 and c3 and c4
screener [c5] (average[7](range) as "rango")