The primary information for Data analysis is obvious data, if that data is normalized and available is the best way to start. If you want to explore some options to play arround with some data sets here are some sources of Commodity Data:
- Pink Sheets (World Bank):
http://www.worldbank.org/en/research/commodity-markets
- IMF Primary Commodity Prices
http://www.imf.org/external/np/res/commod/index.aspx
- Quandl
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