 MTB > describe c2;
 SUBC> by c3.
 
                C3        N     MEAN   MEDIAN   TRMEAN    STDEV   SEMEAN
 C2              0       22    17.79    18.29    17.94     5.02     1.07
                 1       21    11.95    10.70    11.68     6.03     1.32
 
                C3      MIN      MAX       Q1       Q3
 C2              0     7.00    25.70    13.88    22.51
                 1     2.75    26.18     8.81    12.66
 
 MTB > dotplot c2; 
 SUBC> by c3;
 SUBC> same.
 
  C3                                                   .
  0                     .   .   .   . :   :  .:.....   :  .. .
          +---------+---------+---------+---------+---------+-------C2      
  C3                           :
  1             .  .  .  . ....: : :.        .      .       . .
          +---------+---------+---------+---------+---------+-------C2      
        0.0       5.0      10.0      15.0      20.0      25.0
 
 MTB > stem c2;
 SUBC> by c3;
 SUBC> increment = 5.
 
 Stem-and-leaf of C2        C3 = 0          N  = 22
 Leaf Unit = 1.0
 
 
     2    0 78
     6    1 1233
    (9)   1 557788999
     7    2 022234
     1    2 5
 
 
 Stem-and-leaf of C2        C3 = 1          N  = 21
 Leaf Unit = 1.0
 
 
     2    0 24
     7    0 57889
   (10)   1 0000011222
     4    1 7
     3    2 1
     2    2 56

 MTB > twot c2 c3
 
 TWOSAMPLE T FOR C2
 C3   N      MEAN     STDEV   SE MEAN
 1   21     11.95      6.03       1.3
 0   22     17.79      5.02       1.1
 
 95 PCT CI FOR MU 1 - MU 0: (-9.3, -2.4)
 
 TTEST MU 1 = MU 0 (VS NE): T= -3.45  P=0.0014  DF=  38
 
 MTB > twot 99 c2 c3
 
 TWOSAMPLE T FOR C2
 C3   N      MEAN     STDEV   SE MEAN
 1   21     11.95      6.03       1.3
 0   22     17.79      5.02       1.1
 
 99 PCT CI FOR MU 1 - MU 0: (-10.4, -1.2)
 
 TTEST MU 1 = MU 0 (VS NE): T= -3.45  P=0.0014  DF=  38
 

