Basic Analysis and Graphing - SAS

Chapter 5 Performing Oneway Analysis 151
Nonparametric
Table 5.12 Descriptions of Compare Means Options
Difference Matrix
Confidence Quantile
LSD Threshold Matrix
Connecting Letters Report
Ordered Differences Report
Detailed Comparisons Report
Shows a table of all differences of means.
Shows the t-value or other corresponding quantiles used for
confidence intervals.
Shows a matrix showing if a difference exceeds the least
significant difference for all comparisons.
Note: For Hsu’s MCB and Dunnett’s test, only Difference
Matrix, Confidence Quantile, and LSD Threshold Matrix are
applicable.
Shows the traditional letter-coded report where means that are
not sharing a letter are significantly different.
Shows all the positive-side differences with their confidence
interval in sorted order. For the Student’s t and Tukey-Kramer
comparisons, an Ordered Difference report appears below the
text reports.
This report shows the ranked differences, from highest to
lowest, with a confidence interval band overlaid on the plot.
Confidence intervals that do not fully contain their
corresponding bar are significantly different from each other.
Shows a detailed report for each comparison. Each section
shows the difference between the levels, standard error and
confidence intervals, t-ratios, p-values, and degrees of freedom.
A plot illustrating the comparison appears on the right of each
report.
This option is not available for All Pairs, Tukey’s HSD, and
Nonparametric Multiple Comparisons.
Nonparametric
Nonparametric tests are useful for testing whether group means or medians are located the same across
groups. However, the usual analysis of variance assumption of normality is not made. Nonparametric tests
use functions of the response ranks, called rank scores (Hajek 1969).
Note: If you have specified a Block column, then the nonparametric tests are performed on data that has
been adjusted for the Block means.