How to Draw Trend Lines
If you want to draw an upward trend, choose two ascending low points and join them with a straight line to make an upward trend line.
In a downward trend, choose two descending high points and join them with a straight line to create a downward trend line. In order to improve the accuracy of the trend lines in predicting future market movements, we will filter away those trend lines that are not good enough, leaving behind those that will be useful for our technical analysis.
A trend line must undergo a series of tests before it can be considered useful and effective. Those that fail to meet these stringent criteria should be discarded.
First, the existence of a trend must be verified. An upward trend must have two consecutive ascending lows while a downward trend must have two consecutive descending highs. Only then a trend can be considered real and the straight line that joins the two points can be called a trend line.
Next, after the trend line is drawn, a third point must be identified to verify that the line is an effective one. In general, the more points a trend line touches, the more effective it is and the more accurate it will be in predicting future movement.
We must continue to adjust a trend line based on subsequent market situations. For example, when an exchange rate breaks below an upward trend line but then quickly rebounds to move above it, the analyst must redraw the trend line from the first low point to the new low point or try to produce a more effective line using the second low point and the new low point.