| Sumario: | This research was done to find if using maximum likelihood could reduce the Interactive Optimism Scale-Garcia to a new valid and reliable shorter version. There were 502 adults: 263 women and 239 men (M = 34.67, SD = 12.27). It was used in confirmatory factor analysis. A four-item scale is obtained, having excellent goodness of fit: [χ/ df =.609, GFI (Jöreskog and Sörbom's Goodness-of-Fit Index) =.999, NFI (Normed Fit Index) =.999, CFI (Bentler's Comparative Fit Index) = 1.000, RMSEA (Steiger–Lind root mean square error of approximation) =.000 (90% CI =.0001,.077); SRMR (standardized root mean square residual) =.007], as well as factorial invariance across sexes; the scale has good internal consistency (ω =.869, α =.858, ordinal α =.906). Brief Interactive Optimism Scale-G correlates significantly with self-esteem (r =.779, p <. 01, 95% CI [.816,.736]), depression (r = −.810, p <.01, 95% CI [.843,.772]), and psychopathy (r = −.670, p <. 01, 95% CI [.723,.611]). In conclusion, Brief Interactive Optimism Scale-G is a good option for measuring optimism in Mexicans.
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