Bollinger Band Width Check

mokurum

Hi everyone,
this is my first post here. I learned a lot from other posts but could not find the answer to my problem.

I am trying to check the width (or range?) of the Bollinger Bands of monthly RSIs against past 20 periods. Basically I am trying to find if the "Monthly Upper BB - Monthly Lower BB > Average of the past 20 period (Monthly Upper BB - Monthly Lower BB)".

Here is what I have so far. I don't receive a syntax error however this scan returns zero results but I know that it should return at least 1 result (looking at the chart visually within the scanned time interval).

What am I doing wrong?

and [
[[last month's Monthly Upper BB(20,2.0,last month's Monthly RSI(14)) - last month's Monthly Lower BB(20,2.0,last month's Monthly RSI(14))] < [last month's monthly SMA(20,[2 months ago Monthly Upper BB(19,2.0,2 months ago Monthly RSI(14)) - 2 months ago Monthly Lower BB(20,2.0,2 months ago Monthly RSI(14))])]]
]

Any help is appreciated!
Cheers

markd

I seem to remember that the sma( ) and ema( ) functions can only handle individual values, like close, or high, or volume, or indicators, like Force(13), but not custom calculations like sma(10, [high-close]), even though, as you say, there are no syntax errors. Maybe wait for @gord to verify that, or check with Support. In the meantime, I'll see if I can think of a simple test scan to see if that's true (just woke up).

markd

I wonder if you might be able to do something with Bollinger Bandwidth instead:

https://stockcharts.com/school/doku.php?id=chart_school:technical_indicators:bollinger_band_width

mokurum

Thanks markd. I will try it out.