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4. (25 marks) Suppose that Yipi()ind.Bernoulli{pi()},=1+exp(0+xi1)exp(0+xi1), for i=1,,n and =(0,1).
Although the covariate x is fully observed, the response variable Y has missing values. Assuming
ignorability, derive and implement an EM algorithm to compute the maximum likelihood estimate of
based on the data available in the file dataex4 . Rdata. Note: 1) For simplicity, and without loss of
generality because we have a univariate pattern of missingness, when writing down your
expressions, you can assume that the first m values of Y are observed and the remaining nm are
missing. 2) You can use a built in function such as optim or the maxLik package for the M-step.

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