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Examining Data |

In the dialog, point and click to choose a library and data set. |

A *library* is a location where data sets are stored.
Point to the list on the left and click on any
library to see a list of data sets stored there.
Point to the list on the right and click on
any data set to select it for opening.
Then click on **Open** to open a window on the data.

As a shortcut, you can click twice rapidly on the
data set (a *double-click*) instead of clicking
once on the data set and once on the **Open** button.

Each variable in SAS/INSIGHT software has a
*measurement level* that determines the
way it is treated in graphs and analyses.
The measurement level for each variable
appears above the variable name.
You can assign two measurement levels:
*interval* and *nominal*.

- Interval
- variables contain values that vary across a continuous range.
For example,
**NO_ATBAT**is an interval variable in Figure 3.3.

- Nominal
- variables contain a discrete set of values.
For example,
**NAME**is a nominal variable in Figure 3.3.

Each observation in SAS/INSIGHT software has a *marker*,
a graphic shape that identifies the observation in graphs.
The marker for each observation appears
to the left of the observation number.
The number of observations and the number of variables in the
data set appear in the upper left corner of the data window.
The data window in Figure 3.3 shows that
**SASUSER.BASEBALL** has 322 observations and 22 variables.

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