Towards Valid and Reliable Privacy Concern Scales: The Example of IUIPC-8

TL;DR

This paper evaluates the validity and reliability of the IUIPC-8 privacy concern scale using confirmatory factor analysis, comparing it with IUIPC-10, and discusses its practical application in privacy research.

Contribution

It introduces the IUIPC-8 scale, demonstrates methods for assessing its validity and reliability, and compares it with IUIPC-10 using empirical data.

Findings

IUIPC-8 is confirmed to be a valid three-dimensional scale.

IUIPC-8 shows good internal consistency reliability.

Comparison indicates IUIPC-8's suitability for practical use.

Abstract

Valid and reliable measurement instruments are crucial for human factors in privacy research. We expect them to measure what they purport to measure, yielding validity, and to measure this consistently, offering us reliability. While there is a range of privacy concern instruments available in the field and their investigation continues unabated, we shall focus on a brief form of the scale Internet Users? Information Privacy Concerns (IUIPC-8) as an example. We not only present IUIPC-8 itself, but also consider methods for the evaluation of valid and reliable measurement instruments. In this, confirmatory factor analysis (CFA) serves us as a valuable tool. Our inquiry takes into account the ordinal and non-normal data yielded by the IUIPC questionnaire, compares multiple models to confirm the three-dimensionality of the scale, examines global and local fit and, finally, estimates construct validity and internal consistency reliability metrics. We offer a comparison between IUIPC-10 and IUIPC-8 drawing on two independent samples. In conclusion, we highlight properties of the scale and considerations for its use in practice.