Basic Analysis and Graphing - SAS

144 Performing Oneway Analysis Chapter 5
Analysis of Means Methods
Mean Lines, Error Bars, and Standard Deviation Lines
Show mean lines by selecting Display Options > Mean Lines. Mean lines indicate the mean of the response
for each level of the X variable.
Mean error bars and standard deviation lines appear when you select the Means and Std Dev option from
the red triangle menu. See Figure 5.10. To turn each option on or off singly, select Display Options > Mean
Error Bars or Std Dev Lines.
Figure 5.10 Mean Lines, Mean Error Bars, and Std Dev Lines
std dev lines
mean error bar
mean line
Analysis of Means Methods
Note: For a description of ANOM methods, see the document by Nelson, Wludyka, and Copeland
(2005). For a description of the specific ANOM for Variances method, see the paper by Wludyka and
Nelson (1997).
Analysis of means (ANOM) methods compare means and variances across several groups. You might want
to use these methods under these circumstances:
• if you want to test whether any of the group means are statistically different from the overall mean
• if you want to test whether any of the group standard deviations are statistically different from the root
mean square error (RMSE)
Note: Within the Contingency platform, you can use the Analysis of Means for Proportions when the
response has two categories. For details, see the “Performing Contingency Analysis” chapter on page 183.
Compare Means
Use the ANOM and ANOM with Transformed Ranks options to compare group means to the overall mean.