From the complete MSTAT-II to a brief version: Psychometric properties and relationship with anxiety and depression in Peruvian population

Ambiguity tolerance is an important psychological construct, but there is no scale available in Peru. Therefore, it was decided to develop a validation of the Spanish version of the MSTAT-II in Peru. To this end, the clarity of the items was corroborated, and a non-probability, snowball sample of 371 participants was obtained from Lima, Peru. The total sample was then split into training and test datasets. Structurally testing the previous models and a data driven model in the training dataset. The results yielded unacceptable fit indices for the MSTAT-II's previous models, so the 4-item data driven one was used on the test dataset. The data driven model showed acceptable internal structural validity, nomological network validity, and reasonable reliability. It is concluded that the MSTAT-II, on this abbreviated version, meets the criteria for structural validity, nomological network validity, and reliability.