option ls=78;
option ps=65;
data OneWay;
do Treat='T1','T2','T3','T4','T5';
input y @@;output;
end;
cards;
 7 13 20  9 18
 9 15 22 14 16
20 16 21 21 17
19 14 27 22 14
11 23 23  8 22
 6 22 15 10 10
12 16 19  7 15
proc glm data = OneWay;
class Treat;
model y = Treat;
means Treat / lsd line;
means Treat / duncan alpha=0.01;
run;

                                 The SAS System                               1
                                             04:07 Tuesday, November 14, 2006
                              The GLM Procedure
                          Class Level Information
                   Class         Levels    Values
                   Treat              5    T1 T2 T3 T4 T5 
                         Number of observations    35
                              The GLM Procedure
Dependent Variable: y   
                                      Sum of
Source                     DF        Squares    Mean Square   F Value   Pr > F
Model                       4     355.600000      88.900000      3.97   0.0106
Error                      30     672.000000      22.400000                   
Corrected Total            34    1027.600000                                  
              R-Square     Coeff Var      Root MSE        y Mean
              0.346049      29.95483      4.732864      15.80000
Source                     DF      Type I SS    Mean Square   F Value   Pr > F
Treat                       4    355.6000000     88.9000000      3.97   0.0106
Source                     DF    Type III SS    Mean Square   F Value   Pr > F
Treat                       4    355.6000000     88.9000000      3.97   0.0106
                              The GLM Procedure
                             t Tests (LSD) for y
   NOTE: This test controls the Type I comparisonwise error rate, not the 
                          experimentwise error rate.
                    Alpha                            0.05
                    Error Degrees of Freedom           30
                    Error Mean Square                22.4
                    Critical Value of t           2.04227
                    Least Significant Difference   5.1666
          Means with the same letter are not significantly different.
                 t Grouping          Mean      N    Treat
                          A        21.000      7    T3   
                          A                              
                     B    A        17.000      7    T2   
                     B    A                              
                     B    A        16.000      7    T5   
                     B                                   
                     B             13.000      7    T4   
                     B                                   
                     B             12.000      7    T1   
                              The GLM Procedure
                      Duncan's Multiple Range Test for y
   NOTE: This test controls the Type I comparisonwise error rate, not the 
                          experimentwise error rate.
                      Alpha                        0.01
                      Error Degrees of Freedom       30
                      Error Mean Square            22.4
         Number of Means          2          3          4          5
         Critical Range       6.957      7.256      7.455      7.602
          Means with the same letter are not significantly different.
            Duncan Grouping          Mean      N    Treat
                          A        21.000      7    T3   
                          A                              
                     B    A        17.000      7    T2   
                     B    A                              
                     B    A        16.000      7    T5   
                     B                                   
                     B             13.000      7    T4   
                     B                                   
                     B             12.000      7    T1