[amibroker] Exploration on last bar in chart

[s2trader]

I am migrating from Easylanguage to AFL. I wrote an exploration to identify the 
change in direction of High or low standard error bands. My settings are: n 
days: 1, since I wished to get a list of tocks that have turned on the last 
day. 

The last date is March 4. But I am getting stocks that made the turn one day 
earlier on march 3. Which means the pivot low was made on March 3 - March 3 is 
higher than March 2, March 2 is lower than previous day, thus March 2 pivot is 
confirmed on March 3. The database is end of day. The code is given below. Help 
will be appreciated.

Periods = Param("Standard Error", 8, 3, 100, 1); 


function SteBand( array, periods, upper ) 
{ 
  Lr = LinearReg( array, periods ); 
  se = StdErr( array, periods ); 
  return LR + IIf( upper, 1, -1 ) * 2 * se; 
} 

upperstderrband = MA(SteBand( C, Periods, True ),3); 
lowerstderrband = MA(SteBand( C, Periods, False ),3); 
midstderrband = (upperstderrband + lowerstderrband )/2; 

ThisIsLastBar = BarIndex() == LastValue( BarIndex() ); 

IsVolume = Volume * Close > 10000000;

HighMovesDown = Ref(upperstderrband,-1) > upperstderrband AND 
Ref(upperstderrband,-1) > Ref(upperstderrband,-2);
LowMovesUp = Ref(lowerstderrband,-1) < lowerstderrband AND 
Ref(lowerstderrband,-1) < Ref(lowerstderrband,-2);

Filter = ThisIsLastBar  AND IsVolume AND  (HighMovesDown OR LowMovesUp);

AddColumn( Close, "Close" );