In a previous article I showed that a modified Coppock indicator could identify good investment periods for gold. This indicator, with some changes to its parameters, can also be used for silver. The long-time average annual return from silver based on the signals from this indicator exceeded those from gold by a considerable margin, 19.7% for silver versus 14.9% for gold. At the end of April 2011 the model signaled to sell silver and since then it has not produced a buy signal. Note that the indicator has formed a trough now which usually precedes a buy signal.
A complete description of the model has been published in Advisor Perspectives: Silver – Better Than Gold: A Modified Coppock Indicator for Silver