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This downloader is an update and extension of Tom Huggens' Permabear Sentiment Index downloader (Object 726: http://www.quantshare.com/item-726-permabear-sentiment-index) and related downloaders,
and is based on that as well as code/discussion etc from Stack Overflow (maybe especially http://stackoverflow.com/questions/4986758/oauth-google-trends-download-csv-file) and possibly other sources (C# doc., etc).
The general idea is that we can download weekly Google search statistics for certain search terms, and so gauge the sentiment of the public.
The downloader will download such statistics for one or more user-specified search terms, and for each week add the numbers corresponding to the search terms.
Installation:
1. Download and install the downloader
2. Make a directory on your computer where the downloader may write "temporary files" (eg "C:\temp")
3. Go to "Download Manager/Update Download Item", and in "Fields":
a) Insert your Google email/username (exclude @gmail.com) and password
b) Change the query string as needed, with comma between each search term.
It is by default set up for "Permabear Index": "Roubini,Peter Schiff,Marc Faber,Nassim Taleb" (correct with only surname for Roubini?)
c) Change the symbol name as needed (all characters must be allowed in file names, so no "/", ":" etc).
d) Set "work_dir" to the path of the temp directory (eg "C:\temp")
Known limitations:
1. Google restricts the number of downloads per day to an unknown number, possibly depending on download frequency in a short time period.
If this happens, the downloader will fail, and the temporary file (e.g C:\temp\report_^GOOGLE_TRENDS_PERMABEAR.csv) will be a short file including the following string:
"You have reached your quota limit. Please try again later." (can also be seen using the "Parser" button and pressing "Next" a few times).
2. Google may restrict the number of search terms to a specific limit (5?). TODO: Let downloader handle this by using several queries automatically.
For more info, see e. g.:
Tom Huggens description of the original downloader: http://www.quantshare.com/item-726-permabear-sentiment-index
http://stackoverflow.com/questions/4986758/oauth-google-trends-download-csv-file
http://seekingalpha.com/article/227409-evaluating-the-permabear-sentiment-index
http://www.thestreet.com/story/10873412/1/permabear-index-produces-big-gains.html
http://www.google.com/trends/
http://en.wikipedia.org/wiki/Google_Trends
http://stackoverflow.com/questions/17393969/google-trends-quota-limit
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