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...column names. > (D) Does it mean that the dimensions of the matrix are stored as two separate lists? No. The dim is an attribute which is shown implicitly as "[1:844, 1:7]", i.e. c(844, 7). Duncan Murdoch > (E) If so, how do I access the lists? > When I enter > dimnames(marginalcatsx$x) > I receive: > > [[1]] > NULL > > [[2]] > [1] "Good" "Moderate" "Unhealthy For Some" "Unhealthy" "Very Unhealthy" "Hazardous1" > [7] "Hazardous2" > > Thank...

...ove correct? (B) Does the .. ..$ : NULL mean that the matrix has no row names? (C) What does "attr(*, "dimnames")=List of 2" mean? (D) Does it mean that the dimensions of the matrix are stored as two separate lists? (E) If so, how do I access the lists? When I enter dimnames(marginalcatsx$x) I receive: [[1]] NULL [[2]] [1] "Good" "Moderate" "Unhealthy For Some" "Unhealthy" "Very Unhealthy" "Hazardous1" [7] "Hazardous2" Thank you, John John David Sorkin M.D., Ph.D....