Five studies document the validity of a new 8-item scale designed to measure positivity, defined as the tendency to view life and experiences with a positive outlook. In the first study (N = 372), the psychometric properties of Positivity Scale (P Scale) were examined in accordance with classical test theory using a large number of college participants. In Study 2, the unidimensionality of the P Scale was corroborated with confirmatory factor analysis in 2 independent samples (N₁ = 322; N₂ = 457). In Study 3, P Scale invariance across sexes and its relations with self-esteem, life satisfaction, optimism, positive negative affect, depression, and the Big Five provided further evidence of the internal and construct validity of the new measure in a large community sample (N = 3,589). In Study 4, test-retest reliability of the P Scale was found in a sample of college students (N = 262) who were readministered the scale after 5 weeks. In Study 5, measurement invariance and construct validity of P Scale were further supported across samples in different countries and cultures, including Italy (N = 689), the United States (N = 1,187), Japan (N = 281), and Spain (N = 302). Psychometric findings across diverse cultural context attest to the robustness of the P Scale and to positivity as a basic disposition.

The current study examines the contribution of left–right (or liberal–conservative) ideology to voting, as well as the extent to which basic values account for ideological orientation. Analyses were conducted in 16 countries from five continents (Europe, North America, South America, Asia, and Oceania), most of which have been neglected by previous studies. Results showed that left–right (or liberal–conservative) ideology predicted voting in all countries except Ukraine. Basic values exerted a considerable effect in predicting ideology in most countries, especially in established democracies such as Australia, Finland, Italy, United Kingdom, and Germany. Pattern of relations with the whole set of 10 values revealed that the critical trade-off underlying ideology is between values concerned with tolerance and protection for the welfare of all people (universalism) versus values concerned with preserving the social order and status quo (security). A noteworthy exception was found in European postcommunist countries, where relations of values with ideology were small (Poland) or near to zero (Ukraine, Slovakia).