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 I plan to go through all these stop loss examples .  and perhaps  I  can discuss them later .

As a rough guide, trader sell stops generally go below the 50 day MA and the most recent daily swing low, and are generally not more than 10% from the entry point, but more often 5% to 8% range in mid cap stocks (>$20) and larger. Whereas investor stops generally go below the 30 week MA and the most recent weekly swing low and so can be quite far away as they are meant to give the stock much more room.

     Thanks again for your patience .  I found  that you had answerd the "% atr issue " couple of times when 
I  finished this thread .  

     I noticed , just as you say , as an investor  you must torlarate much more pulling back compared with a trader  . hence   you must set a more widely stop position  . 
  
     I first read this book in 2015 , and now i begin to reread it  .    there are still some conceptions which i dont understand . I seach them in google , and it leads me here .  

    Attachment is a chart you posted before .  I have some questions 
   1)   how to find or define a swing high  ?  why X1 is not a swing high 
   2)  when you drew the chart , which one do you use in the following , the weekly high , the weekly low or the weekly close . 

    Thanks for your elaborate efforts .