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Yahoo data flakiness

Discussions regarding financial software
spiderbill
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Re: Yahoo data flakiness

#134687

Postby spiderbill » April 25th, 2018, 1:07 pm

Thanks Kiloran. Had just noticed and was about to post that both HYPTUS and Eventide's Excel plugin weren't bringing up any changes, but find that you're way ahead of me.
Yahoo's web portfolios look a bit more together - at least MPAC and the All Share results are showing.

Could be worse - they could have hired TSB's programmers!

cheers
Spiderbill

kiloran
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Re: Yahoo data flakiness

#134690

Postby kiloran » April 25th, 2018, 1:24 pm

Just looked further at the Yahoo web page (using LLOY.L as an example) https://finance.yahoo.com/quote/LLOY.L?p=LLOY.L

On initial loading, it shows a price of 66.12 (yesterday's close) and a timestamp of "As of April 24 4:37PM BST. Market open"
A few seconds later, the price updates to (presumably) the current price, and this updates as the market price updates, but still with "As of April 24 4:37PM BST. Market open". Some time later, maybe 10s, maybe 1m, the timestamp changes to the correct(?) data, such as "As of April 25 1:04PM BST. Market open."

Same for other stock symbols, and same for Chrome, IE, Firefox

The API used by HYPTUSS and others is still showing yesterday's close for all stocks I've checked. It's sometimes slow, and sometimes returns no data.

--kiloran

Raptor
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Re: Yahoo data flakiness

#134701

Postby Raptor » April 25th, 2018, 1:56 pm

Good luck with that. They never replied to me when I questioned some data a while back. It got corrected, eventually.....

Raptor.

eventide
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Re: Yahoo data flakiness

#134702

Postby eventide » April 25th, 2018, 1:58 pm

I see the same issue, the first call of the URL (whether automated or a plain webpage request) delivers stale data. Where the request is on a webpage, the embedded javascript soon refreshes to the correct data. But automated calls don't have this benefit, so all scrapers are unlikely to be working as far as I can make out.

I don't know if this is by accident or design, but leaving it a few days has usually sorted out problems in the past. I'm not holding my breath this time though.

kiloran
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Re: Yahoo data flakiness

#134711

Postby kiloran » April 25th, 2018, 2:37 pm

Looks like the Yahoo Finance web page and the API are now (as of 14:30 BST) working correctly and the data is credible for those stock symbols I have checked.

--kiloran

kiloran
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Re: Yahoo data flakiness

#134736

Postby kiloran » April 25th, 2018, 4:42 pm

Raptor wrote:Good luck with that. They never replied to me when I questioned some data a while back. It got corrected, eventually.....

Raptor.

Miracles do happen...... I got a response:
We have had some site problems this morning. Our engineers are aware and have been working to resolve the issues. We apologize for the inconvenience and hope to have most issues resolved shortly. Thank you


A bit bland and I guess a generic answer, but somebody at Yahoo did at least respond.

--kiloran

Raptor
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Re: Yahoo data flakiness

#134843

Postby Raptor » April 26th, 2018, 8:41 am

Spoke too soon. Today "no data for tate.l".

Whoops, Raptor.

kiloran
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Re: Yahoo data flakiness

#134850

Postby kiloran » April 26th, 2018, 9:23 am

Raptor wrote:Spoke too soon. Today "no data for tate.l".

Whoops, Raptor.

The data is being updated (not fixed at the previous close like yesterday) but it's still hit and miss:

26Apr18 09:11:24
MRW.L Yahoo>>> 235.7 235.8 235.9 GBp Thu, 26 Apr 2018 08:54:13
PFG.L Yahoo>>> 680.4 679.6 680.2 GBp Thu, 26 Apr 2018 08:45:05
TATE.L Yahoo>>> 570.4 570.2 571.0 GBp Thu, 26 Apr 2018 08:54:25
LLOY.L Yahoo>>> 65.0 64.99 65.0 GBp Thu, 26 Apr 2018 08:56:15
^FTAS Yahoo>>> 4061.33 0.0 0.0 GBP Thu, 26 Apr 2018 09:11:18
26Apr18 09:11:27
MRW.L Yahoo>>> 235.7 235.8 235.9 GBp Thu, 26 Apr 2018 08:54:13
PFG.L Yahoo>>> 680.4 679.6 680.2 GBp Thu, 26 Apr 2018 08:45:05
TATE.L Yahoo>>> 570.4 570.2 571.0 GBp Thu, 26 Apr 2018 08:54:25
LLOY.L Yahoo>>> 65.0 64.99 65.0 GBp Thu, 26 Apr 2018 08:56:15
^FTAS Yahoo>>> 4061.61 0.0 0.0 GBP Thu, 26 Apr 2018 09:11:26
26Apr18 09:11:30
TATE.L Yahoo>>> 570.4 570.2 571.0 GBp Thu, 26 Apr 2018 08:54:25
LLOY.L Yahoo>>> 65.0 64.99 65.0 GBp Thu, 26 Apr 2018 08:56:13
^FTAS Yahoo>>> 4061.61 0.0 0.0 GBP Thu, 26 Apr 2018 09:11:26
26Apr18 09:11:39
MRW.L Yahoo>>> 235.7 235.8 235.9 GBp Thu, 26 Apr 2018 08:54:13
PFG.L Yahoo>>> 680.0 679.2 680.2 GBp Thu, 26 Apr 2018 08:55:55
TATE.L Yahoo>>> 570.4 570.2 571.0 GBp Thu, 26 Apr 2018 08:54:25
LLOY.L Yahoo>>> 65.0 64.99 65.0 GBp Thu, 26 Apr 2018 08:56:13
26Apr18 09:11:43
MRW.L Yahoo>>> 235.7 235.8 235.9 GBp Thu, 26 Apr 2018 08:54:13
PFG.L Yahoo>>> 680.0 679.2 680.2 GBp Thu, 26 Apr 2018 08:55:55
TATE.L Yahoo>>> 570.4 570.2 571.0 GBp Thu, 26 Apr 2018 08:54:25
LLOY.L Yahoo>>> 65.0 64.99 65.0 GBp Thu, 26 Apr 2018 08:56:13
^FTAS Yahoo>>> 4061.64 0.0 0.0 GBP Thu, 26 Apr 2018 09:11:41

I've also noticed that on the web page https://finance.yahoo.com/, if you search for TATE.L and hit enter, it usually displays correct data, but if you then refresh the web page, it consistently responds with "No results for 'tate.l' . Same for many other shares, such as MRW.L, though GSK.L seems to be consistently OK.

Maybe Yahoo use the same IT team as TSB :D

--kiloran

Raptor
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Re: Yahoo data flakiness

#134929

Postby Raptor » April 26th, 2018, 2:44 pm

kiloran wrote:Maybe Yahoo use the same IT team as TSB :D

--kiloran


Be careful they have called in IBM to sort it out. Which in the "old" days might have probably included me............

Raptor.

Arborbridge
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Re: Yahoo data flakiness

#135649

Postby Arborbridge » April 30th, 2018, 7:46 am

I'm glad it's not just me. I've been trying to obtain ULVR weekly historic data unsuccessfully for a week, and this is the result of this morning's attempt:

Time period:
Show:Historical prices
Frequency:Weekly
Currency in GBp
Download data
Date Open High Low Close* Adj. close** Volume
27 Apr 2018 3,961.50 4,059.00 3,947.50 4,051.00 4,051.00 2,284,011
23 Apr 2018 3,910.00 4,059.00 3,900.00 4,051.00 4,051.00 7,668,556

That's all! The time period selected (and showing on screen) was 3 months but this didn't copy and paste into the above.
I did, however, obtain a full set of weeklies for TATE last week. But it is definitely flaky, because it seems hit and miss, with ULVR being a miss all the time - not only that the site seems extraordinary slow to communicate.

Arb.

kiloran
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Re: Yahoo data flakiness

#137415

Postby kiloran » May 7th, 2018, 8:23 pm

HYPTUSS update..... see: viewtopic.php?f=27&t=11579

--kiloran

Itsallaguess
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Re: Yahoo data flakiness

#139373

Postby Itsallaguess » May 16th, 2018, 2:56 pm

Just doing some software testing this afternoon, and I've not actually been able to see the normal Yahoo price-data issues that have been so prevalent lately.

Is this just me, or do others think that things seem to have improved recently?

Cheers,

Itsallaguess

PinkDalek
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Re: Yahoo data flakiness

#139375

Postby PinkDalek » May 16th, 2018, 3:04 pm

Itsallaguess wrote:Just doing some software testing this afternoon, and I've not actually been able to see the normal Yahoo price-data issues that have been so prevalent lately.

Is this just me, or do others think that things seem to have improved recently?

Cheers,

Itsallaguess


On a sample of one, JD Sports kept coming and going. Unfortunately that is no longer happening, such that I can see the fall today!

kiloran
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Re: Yahoo data flakiness

#139397

Postby kiloran » May 16th, 2018, 4:30 pm

Itsallaguess wrote:Just doing some software testing this afternoon, and I've not actually been able to see the normal Yahoo price-data issues that have been so prevalent lately.

Is this just me, or do others think that things seem to have improved recently?

Cheers,

Itsallaguess

I've just thrown 3 shares and the FT All-share index at Yahoo at 2s intervals, and it's worked fine for over 30min, though sometimes the response for ^FTAS was a bit slow.

I did rattle their cage again at the weekend but I've had no response.

--kiloran

spiderbill
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Re: Yahoo data flakiness

#139440

Postby spiderbill » May 16th, 2018, 7:30 pm

Today's been ok when I've looked but yesterday MPAC and the All share index were both missing again at a couple of times. As I recall TATE, was one of the other common problem shares but I don't have that in my portfolio so don't know if that was out as well.

Raptor
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Re: Yahoo data flakiness

#139449

Postby Raptor » May 16th, 2018, 8:47 pm

spiderbill wrote:Today's been ok when I've looked but yesterday MPAC and the All share index were both missing again at a couple of times. As I recall TATE, was one of the other common problem shares but I don't have that in my portfolio so don't know if that was out as well.

Haven't checked HYPTUSS, but my yahoo portfolio has been ok with TATE today.

Raptor

mike
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Re: Yahoo data flakiness

#139499

Postby mike » May 17th, 2018, 8:21 am

The three that were playing up for me - TATE, MRW & PFG - all now seem to be OK. I've tried them a few times and all return prices each time.

spiderbill
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Re: Yahoo data flakiness

#139831

Postby spiderbill » May 18th, 2018, 1:41 pm

So far so good today again. Let's hope they've finally fixed it.

On a slightly different aspect (not relevant to the data aquisition tools like HYPTUS) has anyone else seen weirdness in the Yahoo graphs recently? I'm seeing a lot of them showing the wrong timespan - 5-day graphs instead of 6 month ones, some timespans missing altogether for some shares.
For instance Unilever is currently giving me the same graph for 1 mnth, 3 mnth, 6 mnth, YTD, and 1 year; and it's actually for 16 days!! 2 Year gives me one for 4 weeks with a weekly column instead of daily. Weird!


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