98 Statistics 2Var app
Calculating predicted values
The functions PREDX and PREDY estimate (predict) values
for X or Y given a hypothetical value for the other. The
estimation is made based on the equation that has been
calculated to fit the data according to the specified fit.
Find predicted
values
1. In the Plot view, draw the regression curve for the
data set.
2. Press
\to move to the regression curve.
3. Press and enter the value of X. The cursor
jumps to the specified point on the curve and the
coordinate display shows X and the predicted value
of Y.
In the Home view:
• Enter PREDX(y-value)
Eto find the predicted value
for the independent variable given a hypothetical
dependent value.
• Enter PREDY(x-value) to find the predicted value of the
dependent variable given a hypothetical independent
variable.
You can type PREDX and PREDY into the edit line, or you
can copy these function names from the Commands menu
under the Apps, Statistics 2Var category.
HINT
In cases where more than one fit curve is displayed, the
PREDX and PREDY functions use the first active fit defined
in the Symbolic view.
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