StockFetcher Forums · General Discussion · How can I create a filter to find a trend using Bollinger Bands<< 1 2 >>Post Follow-up
rjcabernet
4 posts
msg #91442
Ignore rjcabernet
4/20/2010 4:53:22 PM

I there a way one can find a trend change based on the close crossing above the upper bollinger band or a close crossing below the lower bollinger band. A close crossing above the upper bollinger would indicate a bullish trend signal. A bearish trend would signal when the closed crossed below the lower bollinger band. This is only a signal if it is the first such cross since the prior trend signal. The prior trend signal can be a day ago or months ago. In other words just because there is a close that crosses above or below the appropriate bollinger band does not signal a start of a trend. The close can cross many times back and forth on the corresponding band while in the trend.

Thanks, RJ

four
3,998 posts
msg #91462
Ignore four
4/20/2010 10:32:37 PM

Fetcher[
high crossed above the upper bollinger band (9)
set{cross, cwma(upper bollinger band (9),20) crossed above upper bollinger band (9)}
draw cross
draw cwma(upper bollinger band (9),20)

volume > 1000000
Average Volume(30) > 250000
close between 5 and 10
chart-length is 4 months
]



chetron
2,817 posts
msg #91474
Ignore chetron
modified
4/21/2010 6:55:04 AM

VERY NICE, FOUR.

MAYBE...

Fetcher[

high crossed above the upper bollinger band (9)
set{VDN, COUNT(cwma(upper bollinger band (9),20) above upper bollinger band (9),1)}
set{VUP, COUNT(cwma(upper bollinger band (9),20) BELOW UPPER bollinger band (9),1)}
draw VDN ON PLOT VUP
draw cwma(upper bollinger band (9),20)

volume > 1000000
Average Volume(30) > 250000
close between 5 and 10
chart-length is 4 months

]



chetron
2,817 posts
msg #91475
Ignore chetron
4/21/2010 7:12:50 AM

BUT THE SHORT ANSWER WOULD BE, IF YOU WANT TO INDENTIFY A TREND, USE A TREND INDICATOR, MOVING AVERAGES, AND NOT A VOLITILITY INDICATOR.


HTH

rjcabernet
4 posts
msg #91485
Ignore rjcabernet
modified
4/21/2010 1:44:53 PM

Thanks for the replies. I misstated a trend for what I am really looking for, which is a momentum breakout using the bollinger bands. I am using Bollingers Bands with a period of 10 and a deviation of .8 IE: upper bollinger band(10,.8) or lower bollinger band(10,.8).

I tried using the filter you supplied with the above parameters and did not get the results I was looking for.
If you click on the following link you may get a better picture of what my intent is. This is a chart showing where the momentum begins and ends.

http://www.carterbillings.com/momentum.jpg

Thanks again for you help

chetron
2,817 posts
msg #91488
Ignore chetron
4/21/2010 2:51:04 PM

isn't that the woodie bb play thingy?????????????

rjcabernet
4 posts
msg #91492
Ignore rjcabernet
4/21/2010 3:39:52 PM

I got it from First Wave - David Elliott

http://groups.google.com/group/firstwave-beginners

I don't think it can be done in SF without a filter that can set flags based on an event in the past using an "if" command.

chetron
2,817 posts
msg #91496
Ignore chetron
modified
4/21/2010 5:14:23 PM

can't be done, shirley,you jest.......


Fetcher[


set{vbuy,count(close crossed above Upper Bollinger Band(10,0.8),1)}
set{vshort,count(close crossed below Lower Bollinger Band(10,0.8),1)}

set{var1,days(close crossed above Upper Bollinger Band(10,0.8),100)}
set{var2,days(close crossed below Lower Bollinger Band(10,0.8),100)}

set{vmomodn,var1 - var2}
set{vmomoup,var2 - var1}

draw vmomodn on plot vmomoup

set{vplays,vbuy + vshort}

draw bollinger(10,0.8)
draw vshort on plot vbuy

add column vshort
add column vbuy

vplays above .5
do not draw vplays

close above .1
volume above 1000000
]



with jp tweaks....

Fetcher[
/* jp influences */



set{vbuy,count(close crossed above Upper Bollinger Band(40,0.4),1)}
set{vshort,count(close crossed below Lower Bollinger Band(40,0.4),1)}

set{var1,days(close crossed above Upper Bollinger Band(40,0.4),100)}
set{var2,days(close crossed below Lower Bollinger Band(40,0.4),100)}

set{vmomodn,var1 - var2}
set{vmomoup,var2 - var1}

draw vmomodn on plot vmomoup

set{vplays,vbuy + vshort}

draw bollinger(40,0.4)
draw vshort on plot vbuy
draw ema(100)

add column vshort
add column vbuy

vplays above .5
do not draw vplays

close above .1
volume above 1000000

]




all together...

Fetcher[

/* all mixed up */
set{vbuy1,count(close crossed above Upper Bollinger Band(40,0.4),1)}
set{vshort1,count(close crossed below Lower Bollinger Band(40,0.4),1)}

set{var11,days(close crossed above Upper Bollinger Band(40,0.4),100)}
set{var12,days(close crossed below Lower Bollinger Band(40,0.4),100)}

set{vmomodn1,var11 - var12}
set{vmomoup1,var12 - var11}

draw vmomodn1 on plot vmomoup1

set{vplays1,vbuy1 + vshort1}

draw bollinger(40,0.4)
draw vshort1 on plot vbuy1

add column vshort1
add column vbuy1

*******************

set{vbuy,count(close crossed above Upper Bollinger Band(10,0.8),1)}
set{vshort,count(close crossed below Lower Bollinger Band(10,0.8),1)}

set{var1,days(close crossed above Upper Bollinger Band(10,0.8),100)}
set{var2,days(close crossed below Lower Bollinger Band(10,0.8),100)}

set{vmomodn,var1 - var2}
set{vmomoup,var2 - var1}

draw vmomodn on plot vmomoup

set{vplays2,vbuy + vshort}
set{vplays,vplays2 + vplays1}

draw bollinger(10,0.8)
draw vshort on plot vbuy

add column vshort
add column vbuy

vplays above .5
do not draw vplays

close above .1
volume above 1000000
]



four
3,998 posts
msg #91497
Ignore four
4/21/2010 5:18:50 PM

@chetron
thanks for the "very nice".

chetron
2,817 posts
msg #91498
Ignore chetron
4/21/2010 5:22:29 PM

@ four, i like to see new looks, and angles posted in the forums.

StockFetcher Forums · General Discussion · How can I create a filter to find a trend using Bollinger Bands<< 1 2 >>Post Follow-up

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