format
The format is:
num [1:8, 1:8] 1 0.84 0.62 -0.53 0.03 0.57 -0.33 -0.63 0.84 1 ...
- attr(*, "dimnames")=List of 2
..$ : chr [1:8] "Lewis" "Roosevelt" "Party Voting" "Median Rental" ...
..$ : chr [1:8] "Lewis" "Roosevelt" "Party Voting" "Median Rental" ...source
Harman, Harry Horace (1976) Modern factor analysis, 3d ed., rev, University of Chicago Press. Chicago. p 166.