The function computes the congruence index according to Zener & Schnuelle (1976).
a character vector with person Holland codes.
a character vector with environment Holland codes.
The function finds the congruence according to Zener & Schnuelle (1976) 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 Zener & Schnuelle (1976) targets (only) three letters from the Holland code. The degree of congruence is output, according to its definition by Zener & Schnuelle (1976), as a reciprocal value of a distance. This means, for example, that a value of '6' 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.
Zener, T. B. & Schnuelle, L. (1976). Effects of the self-directed search on high school students. Journal of Counseling Psychology, 23(4), 353–359.
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