markcrisp 187 posts msg #47859  Ignore markcrisp 
11/7/2006 6:41:16 AM
See subject line. Can this be done?
Say you wanted to find a B.B. standard deviation 3...what would I write?
Thank you

rharmelink 81 posts msg #47870  Ignore rharmelink 
11/7/2006 6:21:20 PM
Is something like this what you're asking for:
Bollinger Bands(50,3.0)

maxreturn 745 posts msg #47871  Ignore maxreturn 
11/7/2006 6:33:04 PM
Mark, the following filter identifies stocks whose closing price is more than 3 standard deviations above OR below the 20 period moving average:
I'm assuming this is what you wanted. If you have any questions, please ask.
Regards
Max

markcrisp 187 posts msg #47875  Ignore markcrisp 
11/8/2006 5:02:47 AM
Hey thanks guys. Great help.
Trouble is I have no idea what the scan means?
Does this mean a 50 day B.B. standard deviation 3?
Bollinger Bands(50,3.0)
Obviously I need to biuld more of a filter around this...
Thanks again
Mark

maxreturn 745 posts msg #47876  Ignore maxreturn modified 
11/8/2006 2:37:11 PM
Hello Mark. Yes, the second parameter allows you to choose the number of standard deviations that the upper/lower bollinger bands will be above/below the moving average. The first parameter allows you to choose the number of periods for the simple moving average. So....
bollinger bands(20,3) will plot a 20 period moving average, an upper band which is 3 standard deviations above the 20 period moving average and a lower band which is 3 standard deviations below the 20 period moving average.
Regards
Max
