This function is mostly useful for generating the qualitative trend analysis plots. It returns the (i-1)-th row of a matrix containing all combinations of elements -1, 0 and 1 of a pre-specified length.
selected row -1 of the combination matrix which shall be returned
length of the combination vector
A numeric vector containing a specific combination of elements -1, 0 and 1; this combination is used to calculate pattern for qualitative trend analysis plot.
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