The function computes the three-letter congruence index according to Wolfe & Betz (1981).
a character vector with person Holland codes.
a character vector with environment Holland codes.
The function finds the congruence according to Wolfe & Betz (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 Wolfe & Betz (1981) targets (only) three letters from the Holland code. The degree of congruence is output, according to its definition by Wolfe & Betz (1981), as a reciprocal value of a distance. This means, for example, that a value of '2' 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.
Wolfe, L. K. & Betz, N. E. (1981). Traditionality of choice and sex-role identification as moderators of the congruence of occupational choice in college women. Journal of Vocational Behavior, 18(1), 43–55. https://doi.org/10.1016/0001-8791(81)90028-2
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