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[amibroker] Exploration giving bad dates



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I am using one indicator, MBI, to give buy signals and MACD zero 
crossing to give sell signals. I plot these as positive and negative 
spikes of one bar duration. I also plot the indicators in separate 
panes so I can see if the buy and sell points are what I expect. 
They are exactly in the right place. 

Now is gets weird. I do an exploration and the buy indicator occurs 
on exactly the same dates as the chart shows. But the MACD zero 
crossing dates are not the same dates as the chart. Some are missing 
too.

Then I plotted a MACD and use the zero crossing for both buy and 
sell signals and plot them as spikes and run exploration and the 
dates are exactly as the chart. Also the sell spikes are exactly the 
same as the MBI/MACD chart. 

How can explore show incorrect sell dates referenced to the MBI/MACD 
chart but correct dates on the MACD only chart?

I don't know if it makes any difference but Settings is set for 
daily long and short with trade on the next open. All stops are 
disabled.

// buy/sell logic is:
myMBI = Cross(MBI, 45); // MBI range 0 to 100, long is up 45 crossing
myMACD = Cross(0 , MACD(6, 19)); // sell on down 0 crossing
Buy = Cover = myMBI;
Sell = Short = myMACD;

// explore is set to:
Filter = Buy OR Sell OR Short OR Cover;
AddColumn(C, "Price", 1.2);
AddColumn(Buy, "Buy", 1.0);
AddColumn(Sell, "Sell", 1.0);

Thanks,
Barry





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