Abstract. Internet Users' Information Privacy Concerns (IUIPC-10) is one of the most endorsed privacy concern scales. It is widely used in the evaluation of human factors of PETs and the investigation of the privacy paradox. We are still missing a dedicated confirmation of IUIPC-10, itself. We aim at closing this gap by systematically analyzing IUIPC's construct validity and reliability. We obtained three mutually independent samples with a total of N=1031 participants. We conducted a confirmatory factor analysis (CFA) on our main sample. Having found weaknesses, we established further factor analyses to assert the dimensionality of IUIPC-10. We proposed a respecified instrument IUIPC-8 with improved psychometric properties. While we could confirm the overall three-dimensionality of IUIPC-10, we found that IUIPC-10 consistently failed construct validity and reliability evaluations, calling into question the unidimensionality of its sub-scales Awareness and Control. Our respecified scale IUIPC-8 offers a statistically significantly better model and outperforms IUIPC-10's construct validity and reliability. The disconfirming evidence on the construct validity raises doubts how well IUIPC-10 measures the latent variable information privacy concern. The sub-par reliability could yield spurious and erratic results as well as attenuate relations with other latent variables, such as behavior.
Note. The technical report appeared as Thomas Groß. Validity and Reliability of the Scale Internet Users' Information Privacy Concern (IUIPC) [Extended Version], https://arxiv.org/abs/2011.11749, 2020.
The definitive version of this work is to appear as Thomas Groß. Validity and Reliability of the Scale Internet Users' Information Privacy Concern (IUIPC). In Proceedings of the 21th Privacy-Enhancing Technology Symposium (PoPETS) 2021(2), Sciendo, De Gruyter, 2021.