The observed positive counts are and . Thus the responder-only estimate is
(1)
This estimates the proportion among the responders; it does not yet address either kind of nonresponse.

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  4. Paper 41
  5. iii
  6. 2009
  7. Past exam of the mathematics course of the University of Cambridge
  8. Mathematics course of the University of Cambridge
  9. Course of the University of Cambridge
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