Basic Analysis and Graphing - SAS

Chapter 2 Performing Univariate Analysis 47
Options for Continuous Variables
Figure 2.7 Normal Quantile Plot
normal quantile scale
Lilliefors confidence
bounds
probability scale
Note the following information:
• The y-axis shows the column values.
• The x-axis shows the empirical cumulative probability for each value.
Related Information
• “Statistical Details for the Normal Quantile Plot” on page 70
Outlier Box Plot
Use the outlier box plot (also called a Tukey outlier box plot) to see the distribution and identify possible
outliers. Generally, box plots show selected quantiles of continuous distributions.
Figure 2.8 Outlier Box Plot
whisker
3rd quartile
shortest half
median sample value
confidence diamond
1st quartile
whisker
Note the following aspects about outlier box plots:
• The vertical line within the box represents the median sample value.
• The confidence diamond contains the mean and the upper and lower 95% of the mean. If you drew a
line through the middle of the diamond, you would have the mean. The top and bottom points of the
diamond represent the upper and lower 95% of the mean.