> are there issues with using the data from the IA? 
Since that much predates our team record keeping of data issues the answer is that we do not know. Maybe someone in this list can chip in and we will add this answer to our dataset known issues which can be found here:

https://wikitech.wikimedia.org/wiki/Analytics/Archive/Data/Pagecounts-raw#Events_and_known_problems_since_2014-03-01

On Mon, May 1, 2017 at 7:51 AM, Cristian Consonni <cristian@balist.es> wrote:
Hi,

I am working on the pagecounts data for a project and I have noticed
that data for the period September, 21st - September 30th, 2009 are
missing.[1]

However I also found that some data for that period are avialable from
The Internet Archive[2].

I see also that somehow at https://stats.grok.se there are some data
available (see for example the page view data for"Influenza" on en.wiki[3]).

So, my question is: are there issues with using the data from the IA? I
checked that besides for a difference for the file
pagecounts-20090921-160000.gz which seems incomplete on
dumps.wikimedia.org the rest of the files are the same.

Thanks in advance for your help.

Cristian
[1]: https://dumps.wikimedia.org/other/pagecounts-raw/2009/2009-09/
[2]: https://archive.org/details/wikipedia_visitor_stats_200909
[3]: http://stats.grok.se/en/200909/Influenza


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