Section 35 “For each ..….” variables

We also need to deal with repetition and multiple cases (e.g. when we know about the effects of X on a child’s health, but we have many children in the programme..…). In particular: - when we have more than one level e.g. multiple children embedded in multiple classrooms - when we have higher-level effects e.g. when classroom effects are not just an aggregate of child effects - time / duration (for each day, for each semester ..…)

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