On the other hand, if IPJC is influenced by job attitudes, the effect of intelligence on IPJC should be similar to its effect on job satisfaction; that is, the sign of the coefficient representing the effect of intelligence on IPJC should be negative.
In summary, the sign of the coefficient relating intelligence to IPJC provides a critical test of the validity of IPJC as a measure of job complexity.
Age is relevant to the questions under consideration because there are two conflicting hypotheses with regard to its effect on IPJC. One the one hand--if IPJC is influenced by job attitudes--the effect of age on IPJC should be negative.
We chose to analyse the interviews conducted in 1982, since they contained a measurement of IPJC. The only other NLSY containing this measure is the first one, administered in 1979.
The reliability of IPJC was determined as .76 based on the internal consistency of its items.
The coefficients relating education to IPJC and to job satisfaction were non-significant (p [is greater than] .2), and the coefficient relating age to IPJC was marginally significant (p [is less than] .06).
3, the crucial parameters of the model--those relating intelligence to IPJC and to job satisfaction--provide strong evidence for the validity of IPJC as a measure of job complexity.
In particular, whereas intelligence directly affects both DOT complexity and IPJC, education affects only DOT complexity (its effect on IPJC is completely mediated by DOT complexity).
More important to this study is the effect of age on IPJC, which was positive but only marginally significant, [Beta] = + .04, p [is less than] .06.
(Note that Gerhart found partial support for the effect of pay on IPJC. This effect is discussed below.) In addition, the model in Fig.
The analyses reported here indicate that intelligence has a positive effect on IPJC, even after DOT complexity is controlled for.
The results of the paper also suggest that DOT complexity and IPJC measure two different, yet related, constructs, and that IPJC is a valid measure of job complexity even when occupation is held constant.