BBTrend: a short and a long Bollinger set compared band for band. When the
short set's lower band has pulled further from the long set's lower band than
the two upper bands have separated, the short-term range is expanding
downward and the reading is negative; the reverse is positive. Normalised by
the short basis so it reads as a percentage.
BBTrend: a short and a long Bollinger set compared band for band. When the short set's lower band has pulled further from the long set's lower band than the two upper bands have separated, the short-term range is expanding downward and the reading is negative; the reverse is positive. Normalised by the short basis so it reads as a percentage.