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[EquisMetaStock Group] What is PREV?



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In a complex formula, how do I determine which part of the formula 
will be operated on by PREV?

Here are some parameters and their results for three consecutive bars:
H+L+C;          259.40   256.37   252.54
H+L+C+PREV;     520.42   776.79  1029.33
H+L+(C+PREV);   520.42   776.79  1029.33
PREV+H+L+C;     520.42   776.79  1029.33

I can't make any sense out of these results:

1)  PREV has the same effect irrespective of position in the formula.
2)  It seems to me that the second value of H+L+C+PREV should be 
515.77, which is 259.40+256.37 

Please advise.

Regards,
Alan  






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