matrix

Two lists crossed, with something in every intersection. Rows are one kind of thing, columns another, and the cell holds whatever happens when the two meet. Because every pair gets a cell, a matrix catches interactions that a table of averages hides, and it also shows the empty cells, which are often the real finding.

Two lists crossed, with something in every intersection. Rows are one kind of thing, columns another, and the cell holds whatever happens when the two meet. Because every pair gets a cell, a matrix catches interactions that a table of averages hides, and it also shows the empty cells, which are often the real finding.

Example

Best when the interesting thing is a pair rather than an item, and you want no pair left unexamined.