Ononot — In a survey using PPS (Probability Proportional to Size) sam

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Data Collectionhard

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In a survey using PPS (Probability Proportional to Size) sampling, a unit $i$ has size $M_i$ . If we select a sample of size $n=1$ , the inclusion probability is $\pi_i = \frac{M_i}{\sum_{j=1}^N M_j}$ . If we draw a sample of size $n > 1$ without replacement, which of the following is true for the inclusion probability $\pi_i$ ?