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StockFetcher Forums · General Discussion · On Balance Volume - OBV<< >>Post Follow-up
four
4,012 posts
msg #85367
Ignore four
1/1/2010 2:05:30 AM

Article: On Balance Volume, Tom Aspray





mystiq
650 posts
msg #85368
Ignore mystiq
1/1/2010 6:40:24 AM

nice article:

trying to duplicate the obv with wma21. but cannot code it correctly. so far seem to be stuck on:

*wma -OR- vma*

draw weekly vma(obv,21)

draw weekly vma(21) of obv(21)

draw weekly vMA(OBV(21),21)

draw weekly obv(21vma)

draw weekly obv(vma21)

ANY SUGGESTIONS ?

Kevin_in_GA
4,557 posts
msg #85369
Ignore Kevin_in_GA
1/1/2010 8:25:44 AM

nice article:

trying to duplicate the obv with wma21. but cannot code it correctly. so far seem to be stuck on:

*wma -OR- vma*

draw weekly vma(obv,21)

draw weekly vma(21) of obv(21)

draw weekly vMA(OBV(21),21)

draw weekly obv(21vma)

draw weekly obv(vma21)

ANY SUGGESTIONS ?
++++++++++++++++++++++

The differences between a weighted MA and an EMA are small enough that you can simply use a custom EMA for this. This is built into the SF OBV function - just add the number of days you want the EMA to be in parentheses after "OBV"

Examples:

Fetcher[
draw OBV(21)
symlist(spy)
]



for weekly versions:

Fetcher[
draw weekly OBV(21)
symlist(spy)
chart-display is weekly
chart-time is 1 year
]



Kevin

mystiq
650 posts
msg #85370
Ignore mystiq
1/1/2010 8:36:24 AM

Thx for the info Kevin....

tomm1111
198 posts
msg #85371
Ignore tomm1111
1/1/2010 10:50:06 AM

This might work using wma. The difference is small. The top plot is ema and the bottom is wma. Top plot is ema and bottom plot is wma.

Fetcher[
set{obvwma21,cwma(obv,21)}

draw obv(21)
draw obvwma21 on plot obv(1)

symlist(spy)
]




Looking into this further something isn't right even if we use cema. It looks like there is an offset that is probably affecting the cwma as well.

Fetcher[
set{obvema1,cema(obv,1)}

draw obv(21)
draw obvema1 on plot obv(1)

symlist(spy)
]




mystiq
650 posts
msg #85394
Ignore mystiq
1/1/2010 10:01:17 PM

...thanks Tom.

but using the info provided, the best display is I have found is:

Fetcher[
draw weekly obv(21)

symlist(spy)
]



mystiq
650 posts
msg #85549
Ignore mystiq
1/5/2010 4:24:05 AM

*code alert*
can anybody code weekly OBV(21) where "the weekly OBV line crosses the weekly ema(21) line" ?

chetron
2,817 posts
msg #85551
Ignore chetron
modified
1/5/2010 6:38:25 AM

NOT ALLOWED


thanx mystiq for getting this allowed.


clickable...



Fetcher[
weekly obv(21) crossed above weekly average obv(21)
]



mystiq
650 posts
msg #85553
Ignore mystiq
modified
1/5/2010 7:16:01 AM

mystiq 1/5/2010 4:24:05 AM
*code alert*
can anybody code weekly OBV(21) where "the weekly OBV line crosses the weekly ema(21) line" ?
chetron 1/5/2010 6:38:25 AM
NOT ALLOWED
@@@@@@@@@@@@@@@@@@@@@

Thanks Chetron, .....then can obv(1) crossing obv(21) be coded ?

@@@@@@@@@@@@@@@@@@@@@
Kevin_in_GA suggested this code-
- Ignore Kevin_in_GA 1/5/2010 6:59:20 AM

set{obvma, CMA(obv,21)}
obv above obvma

?::any more suggestions::?

mystiq
650 posts
msg #85561
Ignore mystiq
1/5/2010 11:32:20 AM

...asked SF support and got:

weekly obv(21) crossed above weekly average obv(21)


(-.-)

StockFetcher Forums · General Discussion · On Balance Volume - OBV<< >>Post Follow-up

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