52018-06-07 14:27:54PeterWatson42018-06-07 14:23:51PeterWatson32013-03-08 10:17:17localhostconverted to 1.6 markup22006-08-15 10:59:02PeterWatson12006-08-15 10:55:41PeterWatsonHere is an example of input for the SPSS procedure found under analyze:scale: multidimensional scaling. The input are pairs (i,j) of times of one subject to correctly respond to semantic category j immediately after identifying category i. The matrix is asymmetric and contains dissimilarities (the default) as higher RTs suggest more dissimilarity between a pair of stimuli. stimulus a b c d e f a 48 56 23 123 45 460 b 78 84 79 210 39 25 c 80 237 200 145 178 127 d 78 160 150 478 256 290 e 65 250 67 312 4 345 f 410 340 312 324 367 367 The code below, which may also be run from the menu, runs the multidimensional scaling procedure specifying a 6x6 asymmetric matrix of user input for six stimuli and the ordinal level of measurement.