[amibroker] How are various statistical functions calculated?

["timgadd" <timgadd@xxxxxxxxx>]

I need to get something straight about the way the some of the 
statistical functions are calculated. I hope the explanation of what I 
am trying to understand is not confused by my lack of understanding. :()

For example, Correlation(Close,Foreign("NDX","Close"),250) ...

Is each value returned from this function the 250-bar average of a 
correlation value that is calculated between each bar of the two input 
arrays? Or does each value of the resulting array represent how two 250-
period regression lines (or some other smoothing) are correlated?

Likewise, is StDev(Close,50) a 50-bar average of the dispersion of each 
value in the array? Put differently, what is the difference between ...

StDev(Close,50) and MA(StDev(Close,1),50)?

Thanks






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