XL: Method to Calculate Interpolation Step Value
ID: Q95479
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The information in this article applies to:
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Microsoft Excel 97 for Windows
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Microsoft Excel for Windows 95, versions 7.0, 7.0a
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Microsoft Excel for Windows, versions 2.x, 3.0, 4.0, 4.0a, 5.0, 5.0c
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Microsoft Excel for OS/2, versions 2.2, 3.0
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Microsoft Excel 98 Macintosh Edition
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Microsoft Excel for the Macintosh, versions 2.x, 3.0, 4.0, 5.0, 5.0a
SUMMARY
The following Microsoft Excel formula performs linear interpolation by
calculating the interpolation step value:
=(end-start)/(ROW(end)-ROW(start))
In the above formula, "end" is the cell address of the larger number,
and "start" is the cell address of the smaller number.
Interpolation is a method used to determine a present or future value
factor when the exact factor does not appear in either a present or
future value table. Interpolation assumes that the change between two
values is linear and that the margin of error is insignificant.
MORE INFORMATION
To create a sample linear interpolation formula, follow these steps:
- Enter the following values in a worksheet:
A1: 9 B1: =(A7-A1)/(ROW(A7)-ROW(A1))
A2: =A1+$B$1
A3:
A4:
A5:
A6:
A7: 11
- Select cells A2:A6. On the Edit menu, click Fill Down. The formula is
filled down, and the following values are displayed in cells A2:A6:
A2: 9.33333
A3: 9.66667
A4: 10.
A5: 10.33333
A6: 10.66667
NOTE: You must enter the reference to the step value in cell B1 as an
absolute reference (with dollar signs).
REFERENCES
"Microsoft Excel Function Reference," version 4.0, page 364
"Microsoft Excel Function Reference," version 3.0, page 201
"Microsoft Excel for Windows Functions and Macros," version 2.10,
pages 104-105
Additional query words:
4.00a 5.00a 5.00c 7.00a 97 98 XL98 XL97 XL7 XL5 XL4 XL3 interpolate
Keywords : xlformula
Version : WINDOWS:2.0,3.0,4.0,4.0a,5.0,5.0c,7.0,7.0a,97; MACINTOSH:2.0,3.0,4.0,5.0,98; os/2:2.2,3.0
Platform : MACINTOSH OS/2 WINDOWS
Issue type : kbinfo
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