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Statistics 2Var App
The Statistics 2Var app is designed for the study of bivariate statistics. It provides tools for entering
numerical data, calculating 2-variable summary statistics, and creating 2-variable statistical plots.
The app can exchange data with the Statistics 1Var app and the Spreadsheet app (explained in
the
User Guide
). It can also receive data from the DataStreamer app and pass summary statistics
directly to the Inference app (where you can calculate confidence intervals and test hypotheses). To
open the Statistics 2Var app, press
I
and select
Statistics 2Var
. The app opens in Numeric
view.
Numeric view
The Numeric view provides a table with up to ten columns for data, named
C1
through
C9
and
C0
. The menu items are the same as those in the Statistics 1Var Numeric view (see page 35).
Symbolic view
Press
Y
to display the Symbolic view. You can define up to five 2-variable
analyses, named S1–S5, by specifying two data columns and a fit type for each analysis. The
menu items, which change according to the field selected, are:
•
: to specify a data column, or, when a
Fit
n
field is selected, to enter or edit a fit
equation. If you enter your own fit equation, the corresponding
Type
n
field automatically
changes to
User Defined
.
•
: displays a menu for you to select a type of fit: linear, logarithmic, exponential, etc.;
visible only when a
Type
n
field is selected
•
: toggles between making an analysis active or inactive
•
: enters a
C
when tapped; visible only when an
S
n
field is selected
•
: enters an
X
when tapped; visible only when a
Fit
n
field is selected
•
: specifies whether a graph of the type chosen will be plotted when you display Plot view. If this is not selected, only
the data points are plotted.
•
: displays the selection in textbook format in full-screen view; visible only when an
S
n
or
Fit
n
field is selected
•
: evaluates the variables in whatever is selected; visible only when an
S
n
or
Fit
n
field is selected
