HP 50g Graphing Calculator - Manual (Page 632)

Page 18-65
“SSE” TAG Tag result as SSE
» Close sub-program 4
» Close sub-program 3
» Close sub-program 2
» Close sub-program 1
» Close main program
Save this program under the name POLYR, to emphasize calculation of the
correlation coefficient r.
Using the POLYR program for values of p between 2 and 6 produce the
following table of values of the correlation coefficient, r, and the sum of square
errors, SSE:
While the correlation coefficient is very close to 1.0 for all values of p in the
table, the values of SSE vary widely. The smallest value of SSE corresponds to p
= 4. Thus, you could select the preferred polynomial data fitting for the
original x-y data as:
y = 20.92-2.61x-1.52x
2
+6.05x
3
+3.51x
4
.
p r SSE
2 0.9971908 10731140.01
3 0.9999768 88619.36
4 0.9999999 7.48
5 0.9999999 8.92
6 0.9999998 432.60