Method
to calculate interpolation step value in Excel
Summary
The
following Microsoft Excel formula performs linear interpolation by calculating
the interpolation step value
following Microsoft Excel formula performs linear interpolation by calculating
the interpolation step value
=(end-start)/(ROW(end)-ROW(start))
where 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.
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:
create a sample linear interpolation formula, follow these steps:
1.
Type the following values in a worksheet:
Type the following values in a worksheet:
2. A1: 9 B1: =(A7-A1)/(ROW(A7)-ROW(A1))
3. A2: =A1+$B$1
4. A3:
5. A4:
6. A5:
7. A6:
8. A7: 11
9.
Select cells A2:A6. On the Edit menu,
point to Fill,
and then click Down. The formula is filled down, and the
following values are displayed in cells A2:A6:
Select cells A2:A6. On the Edit menu,
point to Fill,
and then click Down. The formula is filled down, and the
following values are displayed in cells A2:A6:
10. A2: 9.33333
11. A3: 9.66667
12. A4: 10.
13. A5: 10.33333
14. A6: 10.66667
NOTE: You
must type the reference to the step value in cell B1 as an absolute reference
(with dollar signs).
must type the reference to the step value in cell B1 as an absolute reference
(with dollar signs).
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