Chapter 16: Statistics and Data Plots 265
16STATS.DOC TI-89/TI-92 Plus: Statistics and Data Plots (English) Susan Gullord Revised: 02/23/01 1:12 PM Printed: 02/23/01 2:17 PM Page 265 of 22
Item Description
Freq Type the column number that contains a “weight”
value for each data point. If you do not enter a
column number, all data points are assumed to
have the same weight (1).
Category Type the column number that contains a category
value for each data point.
Include
Categories
If you specify a Category, you can use this to limit
the calculation to specified category values. For
example, if you specify {1,4}, the plot uses only
data points with a category value of 1 or 4.
5. Press ¸ (after typing in an input box, press ¸ twice).
The Plot Setup screen is
redisplayed.
The plot you just
defined is automatically
selected for graphing.
Notice the shorthand
definition for the plot.
From Plot Setup, highlight the plot and press † to toggle it on or off.
If a stat plot is selected, it remains selected when you:
¦ Change the graph mode. (Stat plots are not graphed in 3D mode.)
¦ Execute a Graph command.
¦ Open a different variable in the Data/Matrix Editor.
From Plot Setup:
1. Highlight the plot and
press „.
2. Press B and select the
plot number that you
want to copy to.
3. Press ¸.
From Plot Setup, highlight the plot and press …. To redefine an
existing plot, you do not necessarily need to clear it first; you can
make changes to the existing definition. To prevent a plot from
graphing, you can deselect it.
Note: For an example of
using Freq, Category, and
Include Categories, refer to
page 270.
Note: Any undefined data
points (shown as
undef
) are
ignored in a stat plot.
Selecting or
Deselecting a Plot
Copying a Plot
Definition
Note: If the original plot was
selected (Ÿ), the copy is
also selected.
Clearing a Plot
Definition
Plot Type = Scatter
x = c1
y = c2
Mark = Box