User manual - Modifications Made to ALGEBRA 2.0 by STAT2

3
• Exponential Repression ...
MSE =
Σ
1
n – 2
i=1
n
(ln yi – (ln a + bxi ))
2
• Power Regression ...
MSE =
Σ
1
n – 2
i=1
n
(ln y i – (ln a + b ln x i ))
2
• Sin Regression ...
MSE =
Σ
1
n – 2
i=1
n
(y i – (a sin (bx i + c) + d ))
2
• Logistic Regression ...
MSE =
Σ
1
n – 2 1 + ae
-bx
i
C
i=1
n
y i –
2
uu
uu
uEstimated Value Calculation for Regression Graphs
STAT2 adds a Y-CAL function that uses regression to calculate the estimated y-value for a
particular x-value after a paired-variable statistic regression graph is drawn.
The following is the general procedure for using the Y-CAL function.
1. After drawing a regression graph, press 62 (Y-CAL) to enter the graph selection mode,
and then press w.
If there are multiple graphs on the display, use f and c to select the graph you want, and
then press w.
• This causes an x-value input dialog box to appear.
2. Input the value you want for x and then press w.
• This causes the coordinates for x and y to appear at the bottom of the display, and moves
the pointer to the corresponding point on the graph.
3. Pressing v or a number key at this time causes the x-value input dialog box to reappear
so you can perform another estimated value calculation if you want.
4. After you are finished, press i to clear the coordinate values and the pointer from the
display.
· The pointer does not appear if the calculated coordinates are not within the display range.