BACKGROUND Childhood behavior problems predict subsequent educational achievement; however, little research has examined the etiology of these links using a longitudinal twin design. Moreover, it is unknown whether genetic and environmental innovations provide incremental prediction for educational achievement from childhood to adolescence. METHODS We examined genetic and environmental influe...

This study proposes and illustrates a two-stage strategy to analyze differential item functioning in comparative educational studies. At the first stage, within each country, item difficulties are estimated. At the second stage, results are combined across countries using a meta-analytic framework to investigate (a) whether the items function consistently at the country level, and (b) what coun...

The Progress in International Reading Literacy Study (PIRLS) provides an objective assessment of the reading comprehension attainment of Grade Four primary school students in countries worldwide. Organized by The International Association for the Evaluation of Educational Achievement (IEA) in the USA, PIRLS assesses primary school students’ reading attainment, reading behaviour and attitudes to...

One very significant issues in most educational systems, the question is educational achievement levels of students in exams. The educational system is one of the most important indicators of education performance and evaluation of teaching and the learning is the fact that the performance of the system output in each year. The method of the research is descriptive-survey. The research communit...

The American Psychiatric Association estimates that 3 to 7 per cent of all school aged children are diagnosed with attention deficit hyperactivity disorder (ADHD). Even after correcting for general cognitive ability, numerous studies report a negative association between ADHD and educational achievement. With polygenic scores we examined whether genetic variants that have a positive influence o...

One very significant issues in most educational systems, the question is educational achievement levels of students in exams. The educational system is one of the most important indicators of education performance and evaluation of teaching and the learning is the fact that the performance of the system output in each year. The method of the research is descriptive-survey. The research communit...

May I fi rst thank you, Master and Council, for inviting me to this Induction Comitia 2010. I feel truly honored and humbled to be present as the Guest of Honour. However, let me address you as a fellow Academician – albeit one who has occasional lapses of memory especially of recent events and defi cit of hearing et vision. Today is a great day of celebration for our Academy for we meet to wit...