Add’l Classroom Hours Help with Math, not Literacy

Source: Taylor and Francis website, Jun 2013

On average, the reform changed classroom hours by 2.2–3.3% in literacy and maths, with an impact on student achievement.

For literacy I find no significant effects of classroom hours, but for maths I find stronger effects.

One additional hour per year increases the maths score by 0.21% of a standard deviation, decreases the probability of obtaining a test score below the mean by 0.01%, and increases the probability of obtaining a test score above the mean by 0.08%. One possible explanation for this difference between subjects is that training in literacy takes place in the home environment more than maths and thus is less sensitive to classroom hour changes.

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