[EquisMetaStock Group] How to apply ATR?

[chichungchoi <no_reply@xxxxxxxxxxxxxxx>]

Wilder started with a concept called True Range (TR) which is defined 
as the greatest of the following: 

The current High less the current Low.
The absolute value of the current High less the previous Close.
The absolute value of the current Low less the previous Close.

Does anyone have any suggestions on how many sample of data for ATR
[20]? Is there any rule of thumb on selecting the size of data sample?
If I use ATR[20], should I include 20 of data sample?
If I use ATR[50], should I include 50 of data sample?

Does anyone have any suggestions?
Thanks in advance for any suggestions
Eric


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