Microsoft Office Tutorials and References
In Depth Information
Using FORECAST to Calculate Prediction for Any One Data Point
for the final independent variable ( 102.236). If you enter LINEST and receive
just one value, you should follow these steps:
11. Select a range starting with the LINEST formula in the upper-left
corner. The range should be five rows tall. It should be at least two
columns wide for models with one known_xcolumn. Add additional
columns for additional known_xseries.
22. Press the F2 key to edit the current LINEST formula.
33. Hold down Ctrl+Shift+Enter to reenter the formula as an array.
Alternatively, you can use the INDEX function to pluck one particular
value out of the LINEST function. For example, if you want to retrieve
the
F
statistic
from
row
4,
column
1,
you
could
use
=INDEX(LINEST(E4:E95,B4:D95,TRUE,TRUE),4,1).
In the simpler situation when you have only one independent x variable, you
can obtain the slope and y-intercept values directly by using the following
formula for slope:
INDEX(LINEST(known_y's,known_x's),1)
Use the following formula for the y-intercept:
INDEX(LINEST(known_y's,known_x's),2)
Using
Using FORECAST
to Calculate Prediction for Any One Data Point
When you understand straight-line regression, you can use the FORECAST
function to return a prediction for any point in the future.
FORECAST to Calculate Prediction for Any One Data Point
Note
Note that FORECAST works only for straight-line regression. It
also does not offer the capability to force the intercept to be 0. If you
need this capability, you must use LINEST and then build a prediction
formula as in step 14 of the previous section or the TREND function,
as discussed in the next section.
Syntax
=FORECAST(x,known_y's,known_x's)
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