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Data Collectionhard
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When using the Hansen-Hurwitz estimator Y^HH=1n∑i=1nyipi\hat{Y}_{HH} = \frac{1}{n} \sum_{i=1}^{n} \frac{y_i}{p_i}Y^HH​=n1​∑i=1n​pi​yi​​ for PPS sampling with replacement, which condition must hold to ensure the estimator is unbiased?