Abstract:
To date, there is no reliable psychometric method to distinguish clearly between the important psychological measures of state and trait. Generalisability Theory can be successfully applied to distinguish between state and trait components in a measure, and it is recommended as the most appropriate psychometric method to validate state and trait measurement tools. I will demonstrate such an approach using data from a state mindfulness measure - the Toronto Mindfulness Scale. Generalisability analysis was conducted to examine sources of true and error variances in the measure.