Google data download with getSymbols - is there a limit/quota ?

Use google finance data to make investment
decisions ? Who whould do such a thing ? not me :)

getSymbols has for years included a pause between requests for
multiple symbols

Ah, interesting, but I am not seeing such a pause anywhere in the
getSymbols.google() source (quantmod version 0.4-0 from CRAN)

Anyway, thanks for the suggestions. I have found that it works well if
I have a pause of 15 minutes between each batch of 500 symbols. Could
probably investigate if it can be pushed even lower, but 15 mins is
fine for me.

Bon weekend!

On Sat, 23 Mar 2013 09:35:17 -0500
"Brian G. Peterson" <brian at braverock.com> wrote:

On 03/23/2013 04:14 AM, me wrote:

I am trying to use getSymbols(...,src='google') from the quantmod
package for downloading google finance data for about 1600 symbols,
once a week. Some of that will be used in several quantstrat
strategies.

I am seeing that after having gotten about 500 symbols, trying to
download more will produce http errors.  If I re-try those symbols
the next day, then the quota seems to have been reset and I can
download around 500 symbols again.

Question: Is anyone else experiencing this ?  Would anyone know
what is the minimum time I have to wait before I can download the
next batch of 500 symbols (I hope it's somewhere around several
minutes or several hours, but not more than that) ?

getSymbols has for years included a pause between requests for
multiple symbols, to try to limit the impact you have on their
infrastructure, and avoid some throttling.

I suspect that if you space out your requests, you'll naturally hit
different servers, and probably be fine, but I can't speak from
personal experience.

Obviously, if you intend to use this data for investment decisions,
you're likely violating the Google or Yahoo terms of use anyway, and
you'd likely be better off getting the data from a broker source such
as InteractiveBrokers.

Regards,

  - Brian

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Soren Wilkening

http://censix.com