[amibroker] Why so signals change after the bar closes?

["professor77747" <professor@xxxxxxxxxxxxxx>]

In my formula, I use only the macd and stochastic to determine a buy 
signal. Several times, I didn't have a buy signal after the bar closes. 
Call this bar 1. Then the next bar closes(bar 2) and still no signal. 
Then, during the next bar (bar 3), I get a signal on bar 1. 

When I backtest, the results are the same. No buy on bar 1. Then run 
again on bar 2 and there is no bar. Then, run again on bar 3 and there 
is a buy shown for bar 1. 

I use a 6 hour chart and hourly data. 

I thought that after a bar closes, the macd and stochastic would not 
change.

Why does this happen?

Tom




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