con_twoletter_holland: Congruence Index according to Healy & Mourton (1983)
In holland: Statistics for Holland's Theory of Vocational Choice

Description Usage Arguments Details Value References Examples

The function computes the two-letter congruence index according to Healy & Mourton (1983).

1	con_twoletter_holland(a, b)

`a`	a character vector with person Holland codes.
`b`	a character vector with environment Holland codes.

The function finds the congruence according to Healy & Mourton (1983) between the two-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 Healy & Mourton (1983) targets (only) two letters from the Holland code. The degree of congruence is output, according to its definition by Healy & Mourton (1983), as a reciprocal value of a distance. This means, for example, that a value of '3' is the result for a perfect fit of two two-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.

Healy, C. C. & Mourton, D. L. (1983). Derivatives of the Self-Directed Search: Potential clinical and evaluative uses. Journal of Vocational Behavior, 23(3), 318–328. https://doi.org/10.1016/0001-8791(83)90045-3