Summary
There are four sources of large-scale self-report survey data on victim rates, cross-nationally. These are EU Kids Online, Global School Health Survey, Trends in International Mathematics and Science Study, and Health Behaviour of School-aged Children. There are some differences in methodology between these surveys, but all use pupil self-report data. They have all been used to look at cross-national differences, in relation to other country characteristics and correlates. Here, we examine measures of internal validity (consistency within a survey) and external validity (agreement across surveys) on these data sets. We first report on internal validity issues, using available means within each survey (correlations across strict or lenient frequency criteria; across types of bullying; acros
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