Thanks for your quick reply Billy,
I am probably going to show my ignorance here but I never learned anything by not asking stupid questions :O)
Lets for example add to the Robots a bond fund and we need an ETF with good liquidity so lets choose SHY (iShares Barclays 1-3 Year Treasury Bond).
This fund has a negative correlation with GDX of -0.10 and with IWM of -0.41 over the last 5 years.
http://www.assetcorrelation.com/user/add_to_custom
Would this not be a good alternative to make some money during the times when both GDX and IWM Robot signals are in cash. Or on the other hand be simply a better investment at times than the other two ?
I hope you can indulge me.
Trev