MAT #INDVAR FROM <matrix> TO <Survo_data_file>
marks subsets (samples) of size n of <Survoa_data_file>
by generating 0-1 indicator variables, say S1,S2,...,Sm,
so that Si indicates by 1's the observations whose #'s
appear in ascending order as the i'th row of an
m x n matrix file <matrix>.
The actual names of the indicator variables are the same as
the column labels of <matrix> and they are created as
new variables in <Survo_data_file> if needed.
MAT #INDVAR is a companion operation to MAT #SAMPLES
which generates m samples of size n from integers 1,2,...,N
and saves them as a m x n matrix with row labels
S1,S2,...,Sm.
Active records of <Survo_data_file> cannot be limited
by IND etc. specifications.
A = More about additional MAT #operations
M = More about MAT operations
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