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Group Size    First            Last           Mean      SD
   5       8   23   100.62      30   100.91   100.75    0.09
   4       1   22    98.41      22    98.41    98.41    0.00
   3       6   16    97.19      21    97.39    97.29    0.06
   2       8    8    96.11      15    96.34    96.25    0.07
   1       7    1    94.74       7    95.08    94.95    0.11

In fact, just about any method of cluster analysis should find the
same groups if they are genuine, e.g. -cluster kmeans-. Then use
whatever summary you prefer.

Details follow for -group1d-.

. sort size

. group1d size, max(7)

  Partitions of 30 data up to 7 groups

  1 group:  sum of squares 143.60
  Group Size    First            Last           Mean      SD
   1      30    1    94.74      30   100.91    97.43    2.19

  2 groups: sum of squares 23.00
  Group Size    First            Last           Mean      SD
   2       9   22    98.41      30   100.91   100.49    0.74
   1      21    1    94.74      21    97.39    96.12    0.93

  3 groups: sum of squares 6.62
  Group Size    First            Last           Mean      SD
   3       8   23   100.62      30   100.91   100.75    0.09
   2      15    8    96.11      22    98.41    96.81    0.66
   1       7    1    94.74       7    95.08    94.95    0.11

  4 groups: sum of squares 1.26
  Group Size    First            Last           Mean      SD
   4       8   23   100.62      30   100.91   100.75    0.09
   3       7   16    97.19      22    98.41    97.45    0.40
   2       8    8    96.11      15    96.34    96.25    0.07
   1       7    1    94.74       7    95.08    94.95    0.11

  5 groups: sum of squares 0.20
  Group Size    First            Last           Mean      SD
   5       8   23   100.62      30   100.91   100.75    0.09
   4       1   22    98.41      22    98.41    98.41    0.00
   3       6   16    97.19      21    97.39    97.29    0.06
   2       8    8    96.11      15    96.34    96.25    0.07
   1       7    1    94.74       7    95.08    94.95    0.11

  6 groups: sum of squares 0.14
  Group Size    First            Last           Mean      SD
   6       8   23   100.62      30   100.91   100.75    0.09
   5       1   22    98.41      22    98.41    98.41    0.00
   4       6   16    97.19      21    97.39    97.29    0.06
   3       8    8    96.11      15    96.34    96.25    0.07
   2       5    3    94.95       7    95.08    95.01    0.05
   1       2    1    94.74       2    94.89    94.81    0.08

  7 groups: sum of squares 0.10
  Group Size    First            Last           Mean      SD
   7       2   29   100.84      30   100.91   100.88    0.04
   6       6   23   100.62      28   100.76   100.71    0.05
   5       1   22    98.41      22    98.41    98.41    0.00
   4       6   16    97.19      21    97.39    97.29    0.06
   3       8    8    96.11      15    96.34    96.25    0.07
   2       5    3    94.95       7    95.08    95.01    0.05
   1       2    1    94.74       2    94.89    94.81    0.08

  Groups     Sums of squares
     1          143.60
     2           23.00
     3            6.62
     4            1.26
     5            0.20
     6            0.14
     7            0.10






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