Microsoft Office Tutorials and References
In Depth Information
Performing an Exponential Regression
Figure 14.19.
Figure 14.19. When data is growing at an exponential rate, you use
When data is growing at an exponential rate, you use LOGEST
perform a regression analysis.
22. Enter the beginning of the formula: =LOGEST(
=LOGEST(. Enter the known_y'sas
A2:A9. Leave the constvalue blank. Spe-
cify TRUE for stats. The formula should be
33. Do not press Enter for the formula. Instead, hold down Ctrl+Shift
while pressing Enter to tell Excel to interpret the result as an array
formula and to return a table of values from LOGEST.
44. Add some labels to help interpret the statistics. The labels shown in
columns D and G are examples.
55. To use the results of the regression in a prediction calculation, enter
a different formula than with LINEST. The formula is Intercept ×
Slope^X. In Figure 14.19 , to predict population values for a given gen-
eration in cell I2, use =$F$2*$E$2^I2. Alternatively, you can use the
GROWTH function, discussed in the next section.
B2:B9 and the known_x'sas A2:A9
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