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In this article, we reconsider the problem of estimating the unknown symmetric density in a two-component location mixture model under the assumption that the symmetric density is log-concave. When consistent estimators for the shift locations and mixing probability are used, we show that the nonparametric log-concave Maximum Likelihood estimator (MLE) of both the mixed density and that of the unknown symmetric component are consistent in the Hellinger distance. In case the estimators for the shift locations and mixing probability are p n-consistent, we establish that these MLE’s converge to the truth at the rate n 2=5 in the L1 distance. To estimate the shift locations and mixing probability, we use the estimators proposed by Hunter et al. (2007). The unknown symmetric density is eciently computed using the R package logcondens.mode.

Inference for a two-component mixture of symmetric distributions under log-concavity