Drawing objective trendlines: TD Lines
Although traditional trendlines are notoriously subjective, it is possible to develop trendline-drawing rules and trading guidelines that can be applied consistently and objectively.
Technicians use trendlines to identify trends and determine when they end or reverse. The only problem with traditional trendlines is they are subjective — 10 traders could look at a chart and draw 10 different trendlines. Proper trendline application and analysis require consistent, objective rules.