Timing gold stock buys

http://www.kitco.com/ gives the gold/xau ratio near the bottom of the page each day. Today the ratio is 4.79. Readings near 5 are historically good times to invest in gold stocks. Readings under 3.2 are good times to sell.To put some historical context on this measure, since 1974, the Gold/XAU ratio has been greater than 5.0 about 15% of the time. When the ratio has been this high, the XAU has followed with annualized gains of 89.6%, on average – a figure that remains high even if the data is split into multiple samples. When the ratio has been greater than 4.0, the XAU has followed with average annualized gains of 27.4% (though the finer profile of returns has been sensitive to other conditions such as interest rates, economic trends, and inflation).

In contrast, when the ratio has been less than 3.0 (meaning that the gold stocks are very elevated relative to the actual metal), the XAU has declined at an annualized rate of -36.6%, on average.
Importantly, the return/risk profile for precious metals shares is strengthened further if the economy is experiencing weakness. For example, when the Gold/XAU ratio has been greater than 5.0 and the ISM Purchasing Managers Index has been less than 50 (indicating a contracting U.S. manufacturing sector), gold shares have appreciated at an average annualized rate of 125.6%. In contrast, when the Gold/XAU ratio has been less than 3.0 and the Purchasing Managers Index has been greater than 50, precious metals shares have plunged at an average annualized rate of -49.9% Th e currentPMI - from the ROB Report on Business Jun 2007 Jul 2, 2007 is 56.0