Producing Basic Statistics: Describing the Data

The DESCRIBE command prints descriptive statistics for each column. The statistics produced by this command are:

N -- the number of items in the column
N* -- the number of missing values in the column
MEAN -- the mean of the values in the column
MEDIAN -- the median value in the column
TRMEAN -- the "trimmed" mean of the column- removes the smallest 5%, and the largest 5% of the values, then takes the mean of the rest.

To produce descriptive statistics of the data, type:

MTB> DESCRIBE C2-C6

Here are the results:

                    N     MEAN   MEDIAN  TRMEAN    STDEV   SEMEAN
TEST1 20 78.00 77.50 78.89 14.62 3.27
TEST2 20 78.05 80.00 78.39 14.29 3.19
TEST3 20 77.15 76.50 77.11 12.19 2.73
TEST4 20 80.90 80.00 81.00 11.02 2.46
IMPROV 20 2.90 0.50 2.22 14.56 3.26

MIN MAX Q1 Q3
TEST1 40.00 100.00 70.00 89.75
TEST2 50.00 100.00 66.25 89.50
TEST3 55.00 100.00 70.00 86.00
TEST4 60.00 100.00 70.25 90.75
IMPROV -20.00 38.00 -3.50 8.00
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