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Subject: Re: [office-comment] ODFF: list of suggestions
Hi Eike Nice to hear from you > > PERCENTRANK > > "as a percentage of the data set" - this phrase is surely > > meaningless - needs a rigorous description. > > Could you provide one? PERCENTRANK Summary: Returns the percentage rank of a value in a sample. Syntax: PERCENTRANK( NumberSequenceList Data ; Number X [ ; Integer Significance = 3 ] ) Returns: Number Constraints: o COUNT(Data) > 0 o MIN(Data) <= X <= MAX(Data) o INT(Significance) = Significance; Significance >= 1 Semantics: o Data is the array or range of data with numeric values. o X is the value whose rank is to be determined. (***I removed/edited a bit here) o Significance is an value that identifies the number of significant digits for the returned percentage value. If omitted, a value of 3 is used (0.xxx). (***new bit) For COUNT(Data) > 1, PERCENTRANK returns r / (COUNT(Data) -1), where r is the rank of X in Data. The rank of the lowest number in Data is 0, and of the next lowest number 1, and so on. If X is not in Data, it is assigned a fractional rank proportionately between the rank of the numbers on either side; specifically, if X lies between Xa and Xb (Xa < X < Xb), where Xa has rank ra, the rank of X is calculated as ra + (X-Xa)/(Xb-Xa). In the special case where COUNT(Data) == 1, the only valid value for X is the single value in Data, in which case PERCENTRANK returns 1. Despite its name, PERCENTRANK returns a fraction between 0 and 1 inclusive, rather than a percentage. ========= Does that help? You'll need to subscript the suffixes for Xa, Xb, ra of course I'll look at the other stuff later David
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