HP 39g Master Manual page 139

In the SYMB view (see right) the equation is
given to so many decimal places that it doesn't
fit onto the screen. The simplest way to see
the entire equation is to position the highlight
on the equation and press the
When you do you will obtain the view seen
right which gives the equation of the line of
=
best fit as ˆ
y 0.8199
correlation coefficient of 0.7829 (from the
summary stats seen previously) this would
probably not be regarded as reliable.
On the screen above the equation is given to 4
decimal place accuracy. This is accomplished
by changing to the MODES screen (above the
HOME key) and specifying 'Fixed 4' as the
Number Format. If you don't do this then you
can use the arrow keys to scroll the equation
left or right if it extends off the screen.
A caveat...
It is very important that you display the equation in the SYMB view by
pressing instead of
equation in a form which can be scrolled through problem with this method is
that the calculator thinks that you are choosing to over-ride its choice of
equation with your own by editing it. As long as you press
problem but if you press ENTER it changes the FitType from whatever you
chose to 'User Defined'.
If you are not aware that this has happened then it can have very serious
consequences. For example, if you were now to change the data and then
re-plot, the fit equation will not be re-calculated and will become inaccurate.
+
. With a
x 1.1662
Calculator Tip
One of the most common mistakes people make is to
press instead of
want to display the entire equation. An explanation is given
below.
. Although pressing
key.
. Always use
139
when you
displays the
there is no