Long White Candle
A Long White Candle is first off a White Candle which opens below the close.
O < C
A Long White Candle is also a Long Candle. The following formula checks for the body to be more than 50% longer than the mean body size over the most recent 15 candles. It can use
C - O instead of
ABS(O - C) at the beginning of the formula because we know
O < C.
C - O > 3 * AVG(ABS(O - C), 15) / 2
That is actually the final formula because if it is true, then
O < C also has to be true.