[EquisMetaStock Group] Historical Volatility Exploration

[hcour]

I have the following formula in an exploration to filter below .5. Is there a 
way to modify the exploration so the results are only for those instruments 
below .5 for at least 3 days?
Thanks!

Std(Log(C/Ref(C,-1)),10)/Std(Log(C/Ref(C,-1)),100)