Incentives to Improve Education identifies three categories of incentives: rewards, (financial rewards for teachers), competition (educational choice, often in the form of payment for education by voucher) and threats (introduction of external standards and accountability for performance)

Multilevel models are widely used in education and social science research. However, the effects of omitting levels of the hierarchy on the variance decomposition and the clustering effects have not been well documented. This paper discusses how omitting one level in three-level models affects...

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