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364 Data&Statistics Application
- The variable used to provide frequency information is added to the
label on the horizontal axis in the format: x_variablename
{frequencylist_name}.
4. Point and click the regions of the box plot to explore and analyze the data
it represents.
- Hover over a region or over a whisker to display the details for the
portion of the plot that interests you. The label for the quartile that
corresponds to your selection is displayed.
- Click a region of the box plot to select the data points or whiskers.
Click again to remove the selection.
- You can select any box plot that does not include frequency data and
choose Dot Plot on the context menu to change the plot type.
- Drag a selection to move it and explore other possibilities for the data.
- Use the arrow keys to move a data point one pixel at a time.
- Activate the Graph Trace tool and press ◄or► to move across dots
and regions of the plot. As the trace cursor moves, the values for Q1,
the median, Q3, and whisker ends/outliers are displayed.
5. Change the plot from a modified box plot to a standard box plot by
choosing Extend Box Plot Whiskers on the Plot Properties menu.
The box plot is redrawn as a standard box plot with extended whiskers.
The standard box plot’s whiskers use the minimum and maximum points in
the variable and outliers are not identified. The whiskers on the plot extend
from the minimum data point in the set (x-min) to the first quartile (Q1) and
from the third quartile (Q3) to the maximum point (x-max). The box is
defined by Q1, Med (median), and Q3.
Note: You can click Show Box Plot Outliers on the Plot Properties menu to
return to the modified box plot.
Plotting Histograms
A histogram plots one-variable data and depicts the distribution of data. The
number of bins displayed depends on the number of data points and the
distribution of these points. A value that occurs on the edge of a bin is counted
in the bin to the right.