I want to backtest several basic optimization methods (e.g. MVO, "most-diversified portfolio"), and I want to do this on a basket of different asset indexes. To start with, I want to simulate a 60/40 portfolio (will use this as a benchmark).
What price series should I use, in particular, for bonds? I want to use a free, open source of data, which usually means getting data off of Yahoo! or FRED. I want a long history, back to the 80's if possible.
Does anyone have an example of R code to fetch a good equity and bond portfolio and show the performance of a 60/40 portfolio?