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This object will do a full download of the historical analyst buy and sell recommendations available on yahoo, and store in a local database (yahoo_analyst_ratings). The rating firm, upgrade/downgrade indicator, the past rating and the current rating are all stored. In addition, the downloader contains a function that attempts to map the ratings provided by various firms to a standard numeric score between 5 and 1, where 5 is a strong buy and 1 is a strong sell.
Please note that the mapping to numeric values was not done very scientifically. If you have suggestions for a better mapping I would be happy to update the function to incorporate them. Also the analysts don't use consistent language so over time the mappings will need to be updated to address new discrepancies.
The database is an inter-day database to handle the case where multiple firms report on the same day. In that case, each rating will be stored in the database, recorded one millisecond apart after midnight on the day.
