Example: Estimation of Image Scanning Efficiency---II

• Then, if we assume scans A, B are independent.

  (in practice not true as say short tracks or larger swimsuits would be systematically missed by either graduate or undergraduates!).

• Therefore, making independence assumption

  

  or

  

  is desired estimate of total number of events.

• In practice, second scan will usually only be done on a subset of data sample.

• Note if A, B independent

  

  independent of B.