The function computes the three-letter Compatibility index according to Wiggins & Moody (1981).
a character vector with person Holland codes.
a character vector with environment Holland codes.
The function finds the congruence according to Wiggins & Moody (1981) between the three-letter Holland codes given in argument a, which is the person code, and argument b, which is the environment code. The Index as defined by Wiggins & Moody (1981) targets (only) three letters from the Holland code. The degree of congruence is output, according to its definition by Wiggins & Moody (1981), as a reciprocal value of a distance. This means, for example, that a value of '8' is the result for a perfect fit of two three-letter codes !
a numeric with value for congruence.
Holland, J.L. 1963. A theory of vocational choice. I. Vocational images and choice. Vocational Guidance Quarterly, 11(4), 232–239.
Wiggins, J.D.; Moody, A. (1981). Compatibility index description; Training and Associates: Dover, DE.
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