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Try this - it's one way of doing it - there are many ways - and 
I added the reverse of your buy signals for sell signals so you can see how 
it would work both directions. 
Buy1 =  Cross(Ref(Close,-2), 
Ref (MA(Close, 50),-2));
Buy2 =  Ref(Close,-1)> Ref 
(MA(Close, 
50),-1);
Buy3 = Close >  MA(Close,50);
Buy = Buy1 AND Buy2 AND Buy3; 
Plot  (Buy,"Buy",colorGreen,styleOwnScale + 
styleArea,0,2);
Sell 1 = Cross ( Ref (MA(Close, 50),-2), Ref(Close,-2));
Sell 2 = Ref(Close,-1) < 
Ref (MA(Close, 50),-1);
Sell 3 = Close < 
MA(Close,50);
Sell  = Sell1 
AND Sell2 AND Sell3;
Plot  (Sell,"Sell",colorRed,styleOwnScale + 
styleArea,0,2);
I separated each into three 
statements for clarity of intent - one for each condition - first day cross, 
second day and third days still above (or below respectively) the moving 
average........... and gave you a plot of the buy and sell signals if you want 
to use this in a separate indicator from the arrows on the price chart for 
testing or whatever.
Good luck, the initial learning curve is steep, but sweet............. 
Mike 
  
   
  ----- Original Message -----  
  
  
  Sent: Wednesday, February 02, 2005 2:29 
  PM 
  Subject: [amibroker] Simple Query 
  
 
  I know this must be in the manual some 
  where..
  Can anyone write me a quick Buy condition that if the stock 
  closed up - last 3 days above the 50 day moving Average?
  Please no 
  flames.....
  -- thanks -- newbie.
 
 
 
 
  Check 
  AmiBroker web page at: http://www.amibroker.com/
  Check 
  group FAQ at: http://groups.yahoo.com/group/amibroker/files/groupfaq.html 
  
  
  
Check AmiBroker web page at: 
http://www.amibroker.com/ 
 
Check group FAQ at: http://groups.yahoo.com/group/amibroker/files/groupfaq.html
  
 
 
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