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From: comjoew@ubvms.cc.buffalo.edu (Joseph D Woelfel)
Subject: CATPAC
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Date: Mon, 24 Oct 1994 18:22:00 GMT
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	Arbitron diaries are simple ASCII text, not numerically encoded. There
are hundreds of thousands of them. Before CATPAC, they were read by human
beings, who determined the main issues of concern and categorized the
responses. This was very expensive.

	CATPAC reads the raw text, and assigns a "neuron" in an IAC
network to each non-trivial word. It then passes a scanning window through
the text; whenever a word is in the window, its corresponding neuron is
activated. Synaptic weights are adjusted by a modified Hebb rule, and 
the resulting square matrix of connection weights is then cluster analyzed
and decomposed into a perceptual map, which provides a visual display of
the relationshis among the words.

	CATPAC is widely used in advertising and market research to read
in-depth interviews and focus groups; it's used extensively in the auto
industry as well.

	Joe Woelfel
	University at Buffalo


o bi  
