The most general representation of data matrix is following:
29 *DATA COUNTRIES,A,B,C,D
30 C Country Coffee Tea Beer Wine Spirits
31 D ----------- AAAA AAAA ----- ----- XXX
32 A Italy 3.6 0.06 13.6 106.6 2.0
33 * Portugal 2.2 0.03 27.5 89.3 0.9
34 * Finland 12.5 0.15 54.7 7.6 2.7
- - - - - - - - - - - - - - - - - - - - - - - - - - -
43 B Ireland 0.2 3.73 124.5 3.8 1.9
Data COUNTRIES is defined by a DATA specification on line 29.
The observations are on lines A-B (32-43) and the names of the
variables (columns) on line C (30). The new parameter D (31)
is the label of a mask line which specifies the status of each
variable (column) in the analysis (--- is an inactive variable).
Missing values are indicated by a '-' or by leaving the cell empty.
This is the only form of a data matrix which permits writing
new data values (like residuals and other derived variables)
in statistical operations. Data files are, of course, still
more flexible in this respect.
D = More information on data representation
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