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...either convert the data.frame into ordered factors OR how to assemble the vectors (of ordered factors) into an array that preserves the factors. Many thanks in advance for any help. Robert -- Robert Cassidy, PhD Department of Psychology Concordia University 7141 Sherbrooke W. Montreal (QC) H4B 1R6 tel: (514) 848-2424 x2244 fax: (514) 848-4523 office: PY-119.2

...and-line-version-of-R Cheers, -Kent -- Kent Conover, Ph.D. Research Associate Professor Shizgal Laboratory/Concordia Brain Imaging Group Center for Studies in Behavioral Neurobiology Psychology Department, Concordia University 7141 Sherbrooke Street West, SP-153.19 Montreal, Quebec, Canada, H4B 1R6 514 848-2424 x8653 *“The greatest value of a picture is that is forces us to notice what we never expected to see”* -John Tukey [[alternative HTML version deleted]]