[R] Newbie question re stddev, quantmod and performanceanalytics

[afx111]

Hi,

I am trying to calculate the std dev of returns of YHOO so far i got:

getSymbols("YHOO")
retYHOO <- Return.calculate(Cl(YHOO))
> sd(retYHOO)

YHOO.Close 
        NA 

but i received an NA....can any assist? tks!
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