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To: Bill Lanius who wrote (8937)	3/12/1999 9:37:00 AM
From: John Schott	Read Replies (1) \| Respond to of 11149

Bollinger Band measuring I didn't check but I remember that there are at least four Bollinger band calculating scans on Brookes site (if you go to www.qp2.com or www.qp2b.com, there is a hyperlink to her address). You can download them and import them into the QP2 scan function. Using edit (or just reading the raw file in an editor) you can see how they do the calculation. By editing the one of them you like, you can easily make a scan that merely calculates todays value of bollinger band (which takes the last 20 days of data if that is your setting) Then add the +/- % test yourself. Hope this helps.

To: Bill Lanius who wrote (8937)	3/17/1999 7:23:00 PM
From: TechTrader42	Read Replies (2) \| Respond to of 11149

Bill: You were looking for bands that had constricted to x amount (for example, 2 or 3 percent). You could build on the Bollinger band values scan and do it like this: //bbands, by Brooke output="bolling.lst"; float bolbandlower, bolbandlprev, bolbandupper, bolbandmid; bolbandlower:=movavg(0,20,cl)-(StDev(0,-19)2); //bolbandlprev:=movavg(-1,20,cl)-(StDev(-1,-20)2); bolbandupper:=movavg(0,20,cl)+(StDev(0,-19)2); bolbandmid:=movavg(0,20,cl); if bolbandupper<=1.03bolbandlower then //Percentage of upper vs. lower println Symbol, ", " , " Close:", Close(0):6:3, ", " , "Upper vs. lower: ", bolbandupper/bolbandlower:6:2, ", ", "Bollinger upper: ", bolbandupper:6:2, ", ", "Bollinger lower: ", bolbandlower:6:2, ", ", "Bollinger middle: ", bolbandmid:6:2; endif;