You need at least 14 bars (this is just my convention, and by no means a standard) to identify a trend. For example if you are using 1 minute bars, you will need 14 , 1 minute bars.
If you are using EOD charts, you need 14 EOD bars…so on and so forth.
14 day convention is just to establish a trend. To identify trend reversals one needs to look at a slightly larger time frame. Here is where the accumulation and markup phase plays a role - http://zerodha.com/varsity/chapter/dow-theory-part-1/ check out section 17.2.
seems good…can u check for me the EOD AND EOW trend of TECHM fno…i checked EOD is in buy mode and past 2 days it moved more than 100 rupees…thats great piece of info…thannx lot…