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$$hat{tau} = frac{sum_{i = 1}^K frac{1}{sigma_i^2} hat{tau_i}}{sum_{i = 1}^K frac{1}{sigma_i^2}} $$ PartA Consider the case of K independent studies. Let 1%; denote each study 1's
$$\hat{\tau} = \frac{\sum_{i = 1}^K \frac{1}{\sigma_i^2} \hat{\tau_i}}{\sum_{i = 1}^K \frac{1}{\sigma_i^2}} $$
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