This was discussed some time back and has a logical explanation. Do a
search for StDev(
herman
> Hi,
> Getting a 0.0000 during explorations with stdev.
> Not all stocks, just some.
> However, using the same code, I get successful plots.
> Can't find anything in the manual to indicate why this is
> happening, and there seems to be no odd data in the symbol which might cause
> it to go astray.
> Here is the code, with some debug statements:
> VSPR = (C/Ref(C,-1)); //works OK
> VSLog = log(C/Ref(C,-1)); // works OK
> VolStd = StDev(log(C/Ref(C,-1)),200); // Fails, gives 0.000000
> Anyone have similar probs?
> TIA
> RZ
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