MLE estimates are often undesirable because

they are biased
they have high variance
they are not consistent estimators
none of the above

The correct answer is: B. they have high variance.

Maximum likelihood estimation (MLE) is a method of estimating the parameters of a statistical model. It is based on the principle of maximizing the likelihood function, which is a function of the parameters and the data.

MLE estimates are often desirable because they are unbiased and efficient. However,

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they can have high variance, which means that they can be unstable and fluctuate widely from sample to sample.

Option A is incorrect because MLE estimates are unbiased. This means that the expected value of the MLE is equal to the true value of the parameter.

Option C is incorrect because MLE estimates are consistent estimators. This means that the MLE converges to the true value of the parameter as the sample size increases.

Option D is incorrect because MLE estimates are often desirable. They are unbiased and efficient, but they can have high variance.

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