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»Forums Index »Product Support »ProphetX Support »Adding 'bandwidth' custom feature to Bollinger Bands chart. How to?
Author Topic: Adding 'bandwidth' custom feature to Bollinger Bands chart. How to? (5 messages, Page 1 of 1)

AMA
-DTN Evangelist-
Posts: 183
Joined: Aug 1, 2007


Posted: Mar 17, 2012 06:45 PM          Msg. 1 of 5
Hi - I looked through the help guide and came up empty. I don't know enough about ProphetX to go much further and would like to know how to do the following:

* I want to add in 'bandwidth' to an existing Bollinger Bands chart. Bandwidth = (top BB line - bottom BB line)/middle BB line. I currently have the top/middle/bottom BB lines on an existing chart...

* The f(x) standard studies side section didn't have a create option when I right clicked on it. Other studies did, but not BB...

* I understand the existing BB stuff in ProphetX and would like to add in this element. So, did I just miss this in the documentation somewhere or can you tell me how to add in this custom calculation for live usage? Not much to it; just grab the three numbers, do some math and throw up a resulting number at the bottom of the existing chart, updated live, creeping along with the current chart....a small 'chart within a chart' kinda thing.

DTN_Tim Walter
-DTN Guru-
Posts: 1238
Joined: Apr 25, 2006


Posted: Mar 19, 2012 10:05 AM          Msg. 2 of 5
Hello Ama,

ProphetX does not have that feature built-in at this time, but we have escalated your request to our product management teams for consideration in a future release.

I will try to investigate if there is a way to achieve what you need through our custom studies features though and let you know shortly.

Tim

DTN_Tim Walter
-DTN Guru-
Posts: 1238
Joined: Apr 25, 2006


Posted: Mar 19, 2012 10:55 AM          Msg. 3 of 5
Ama,

I think I have it for you.

If you create a new custom study and use this formula

(MOV(SERIES,20)+(2*STDEV(SERIES,20)))-(MOV(SERIES,20)-(2*STDEV(SERIES,20)))

I believe that will give you what you need. If you need help creating a study, here is a link to that help page to assist you.

http://www.telvent.com/PRXHelp/CREATING_A_NEW_USER_CUSTOM_STUDY.htm

Let us know if you have questions,

Tim



File Attached: forumBandwidth.jpg (downloaded 1285 times)

DTN_Tim Walter
-DTN Guru-
Posts: 1238
Joined: Apr 25, 2006


Posted: Mar 19, 2012 11:01 AM          Msg. 4 of 5
BOLL(SERIES, 20,0,1, 2.0)-BOLL(SERIES, 20,0,2, 2.0)

This formula is a little cleaner and gives the same results if you wish to use this instead.

Tim

AMA
-DTN Evangelist-
Posts: 183
Joined: Aug 1, 2007


Posted: Mar 19, 2012 01:28 PM          Msg. 5 of 5
AHA! You da Mon, Tim...I'll try your suggestions, but it will probably be later in the week or the weekend before I get to it.

Nice to know I didn't miss something in the doc, for once... I'm pretty green on ProphetX and only know what I know for my basic setup. Most of my efforts have been on the DTNIQ side of the house in the past.

I wasn't aware of the custom studies features until I poked around the other day. There are a few custom chart goodies I'd like to explore when I have more time, so this will come in very handy.

Thanks again...
 

 

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