Letter Similarity Data Set Archive
Boles & Clifford, 1989
Boles, D.B., & Clifford, J.E. (1989). An upper- and lowercase alphabetic similarity matrix, with derived generation similarity values.
Behavior Research Methods, Instruments, & Computers
, 21, 579-586.
All pairs of uppercase and lowercase were judged by participants for their visual similarity.
Each letter pairs was presented horizontally. Participants rated the pairs on visual similarity, with 1 representing low similarity and 5 representing high similarity.
The characters were not italicized and were without serifs.
Results are available
. These were taken from D. B. Boles own transcription, also found
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