Portfolio visualizer and portfolio charts are great for back testing numerous asset classes to the 19 seventies. i am curious about back testing a risk paroty portfolio for early retirement years like 19 29, 19 37, 19 65, 19 66 and 19 68. I read erne's article about the benefits of adding ten to 15 % gold, though, and it seems his estimate for the golden butterfly's performance going back to the 19 twenties was that in the worst year, which happened in the 19 thirties,. This result could be interpreted as good or bad, depending on if the retire didn't mind portfolio depletion versus wanting to preserve more of their initial investment. But the four point