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Author Hanna J. Neroj & Jim Nixon |
| Abstract A new scale measuring pilot subjective mental workload was developed as part of the Horizon 2020, Future Sky Safety Project: The validity of new measures needs to be established for effective and reliable implementation. This article investigates the validity of this new scale through assessment of psychological distances between linguistic variables on the scale and subsequent transformation from discrete to continuous scale using fuzzy sets theory. Although the new scale has claimed ordinal properties for the items, no evidence exists to support the interval properties of the scale and any subsequent analysis using statistical methods. The results in this article show linear progression of the items on the scale, supporting the order of the items. To establish the interval properties of the scale, the distances between the ordered items were evaluated using fuzzy sets theory using the Fuzzy Logic Designer in MATLAB. Transformation to continuous scale using fuzzy sets may allow the capture of the dispersion of the data around specific points, showing the degree to which each score belongs to different linguistic category of mental workload. Finally, a proposal for incorporating the validated performance measure was presented. |
