cmlee said:
is there anyway to predict how much the correction will go?
Fibonacci Retracements are displayed by first drawing a trendline between two extreme points (i.e., a significant trough and peak). After selecting Fibonacci Retracement from the Insert menu, a series of up to nine horizontal lines will be drawn at the Fibonacci levels of 0.0%, 23.6%, 38.2%, 50.0%, 61.8%, 100%, 161.8%, 261.8%, and 423.6%.
After a significant move (either up or down), prices will often rebound and retrace a significant portion (if not all) of the original move. As the price retraces, support and resistance levels will often occur at or near the Fibonacci Retracement levels.