StockFetcher Forums · General Discussion · Question Re Bollinger Bands<< >>Post Follow-up
SFMc01
354 posts
msg #143240
Ignore SFMc01
4/17/2018 10:39:39 AM

I have no idea as to what the considerations are when setting the parameter for the "number of days." To put it another way, When setting the indicator what should I consider when setting it as:
"Draw Bollinger Bands(20,2.5)" ...or... "Draw Bollinger Bands(30,2.5)"

Any insights would be appreciated.

Steve

BlackBars
54 posts
msg #143241
Ignore BlackBars
4/17/2018 12:33:12 PM

https://www.youtube.com/watch?v=29oySXosRl0

https://www.youtube.com/watch?v=fYyIGjGI6lw

https://www.youtube.com/watch?v=2dTh3iI0is8

https://www.youtube.com/watch?v=PONc9GkzFrA


The 1st, 2nd, and 4th link tell you everything you need to know about BBands. They bascially answer your question in detail. The 3rd link warns the dangers of unregulated capitalism. Very educational.

SFMc01
354 posts
msg #143256
Ignore SFMc01
4/18/2018 10:22:10 PM

BlackBars: Thank you. I've now watched all 4 videos and not one said anything about how to choose a time period.(the number of days). One author used a constant 21 days with no explanation why. Thanks again.

If anyone else has an insight into this question, I'd appreciate hearing it.

Steve

four
5,087 posts
msg #143257
Ignore four
modified
4/18/2018 11:32:22 PM

Main Site:
https://www.bollingerbands.com/

-- --

Rules:
https://www.bollingerbands.com/bollinger-band-rules

-- --

Videos about standard deviation:





ron22
228 posts
msg #143258
Ignore ron22
4/19/2018 8:30:09 AM

Steve, John Bollinger suggested the following periods: 10 for short term(ST); 20 for medium term(MT); and 50 for long term(LT). He did not define ST, MT and LT. I am guessing that ST is for swing trading, MT is for position trading and LT is for trading from 6 months to 2 years. Good luck Ron

BlackBars
54 posts
msg #143261
Ignore BlackBars
4/19/2018 11:27:40 AM

WOW FOUR OKAY I SEE HOW IT BE LOL

nibor100
727 posts
msg #143263
Ignore nibor100
4/19/2018 12:06:21 PM

@Steve,

According to the book 'Bollinger on Bollinger Bands':

"The defaults for Bollinger Bands are a 20-day calculation-approximately the number of trading days in a month- and +or- 2 standard deviations. ... With a sample size of 30 or greater, +or- 2 standard deviations should contain about 95% of the data. ....to summarize the findings:At 20 periods and 2 standard deviations you get containment between 88 abd 89 percent in most markets."

I find that reading the books/articles written by those who developed technical analysis indicators usually provides lots of additional insight into their rationale and development process and what their recommended useage rules are.

Hope this helps,
Ed S.



SFMc01
354 posts
msg #143267
Ignore SFMc01
4/20/2018 8:16:41 AM

Thanks everyone. That helps a lot.
Steve

four
5,087 posts
msg #143273
Ignore four
4/20/2018 10:10:18 AM

welcome

StockFetcher Forums · General Discussion · Question Re Bollinger Bands<< >>Post Follow-up

*** Disclaimer *** StockFetcher.com does not endorse or suggest any of the securities which are returned in any of the searches or filters. They are provided purely for informational and research purposes. StockFetcher.com does not recommend particular securities. StockFetcher.com, Vestyl Software, L.L.C. and involved content providers shall not be liable for any errors or delays in the content, or for any actions taken based on the content.


Copyright 2018 - Vestyl Software L.L.C.Terms of Service | License | Questions or comments? Contact Us
EOD Data sources: DDFPlus & CSI Data Quotes delayed during active market hours. Delay times are at least 15 mins for NASDAQ, 20 mins for NYSE and Amex. Delayed intraday data provided by DDFPlus


This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.