HP 33s - Manual (Page 268)

16–8 Statistics Programs
5. Repeat steps 3 and 4 for each data pair. If you discover that you have made
an error after you have pressed g in step 3 (with the &@value prompt still
visible), press g again (displaying the %@value prompt) and press X U
to undo (remove) the last data pair. If you discover that you made an error after
step 4, press
X U. In either case, continue at step 3.
6. After all data are keyed in, press X R to see the correlation coefficient, R.
7. Press g to see the regression coefficient B.
8. Press g to see the regression coefficient M.
9. Press g to see the %@value prompt for the xˆ ,
yˆ
–estimation routine.
10. If you wish to estimate
yˆ
based on x, key in x at the %@value prompt, then
press g to see
yˆ
(&@).
11. If you wish to estimate xˆ based on y, press g until you see the &@value
prompt, key in y, then press g to see xˆ (%@).
12. For more estimations, go to step 10 or 11.
13. For a new case, go to step 2.
Variables Used:
B Regression coefficient (y–intercept of a straight line); also
used for scratch.
M Regression coefficient (slope of a straight line).
R Correlation coefficient; also used for scratch.
X The x–value of a data pair when entering data; the
hypothetical x when projecting
yˆ
; or xˆ (x–estimate)
when given a hypothetical y.
Y The y–value of a data pair when entering data; the
hypothetical y when projecting
xˆ ; or yˆ (y–estimate)
when given a hypothetical x.
i Index variable used to indirectly address the correct
xˆ –,
yˆ
–projection equation.
Statistics registers Statistical accumulation and computation.