Basic Analysis and Graphing - SAS

Chapter 5 Performing Oneway Analysis 137
Quantiles
Table 5.3 Descriptions of Display Options (Continued)
X-Axis proportional
Points Spread
Points Jittered
Matching Lines
Matching Dotted Lines
Histograms
Makes the spacing on the x-axis proportional to the sample size
of each level. See “Mean Diamonds and X-Axis Proportional”
on page 143.
Spreads points over the width of the interval
Adds small spaces between points that overlay on the same y
value. The horizontal adjustment of points varies from 0.375 to
0.625 with a 4*(Uniform-0.5) 5 distribution.
(Only appears when the Matching Column option is selected.)
Connects matching points.
Only appears when the Matching Column option is selected.)
Draws dotted lines to connect cell means from missing cells in
the table. The values used as the endpoints of the lines are
obtained using a two-way ANOVA model.
Draws side-by-side histograms to the right of the original plot.
Quantiles
The Quantiles report lists selected percentiles for each level of the X factor variable. The median is the 50th
percentile, and the 25th and 75th percentiles are called the quartiles.
The Quantiles option adds the following elements to the plot:
• the grand mean representing the overall mean of the Y variable
• outlier box plots summarizing the distribution of points at each factor level
Figure 5.7 Outlier Box Plot and Grand Mean
outlier box plot
grand mean
Note: To hide these elements, click the red triangle next to Oneway Analysis and select Display Options >
Box Plots or Grand Mean.