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• W1973464501 abstract "SUMMARY One way of selecting models is to choose that model for which the maximized log likelihood minus a multiple of the number of parameters estimated is a maximum. This note explores the choice of values for the multiplier, with the value one corresponding to Akaike's information criterion. The relationship with Bayesian procedures is mentioned. Suppose that there are a number of competing models which may be fitted to some data. If the log likelihood of the ith model maximized over q* parameters is Li, the generalized information criterion is to choose the model for which Li - -1cq* is a maximum. In the criterion suggested by Akaike as equals 2. Values of os in the range 1-4 are considered by Bhansali & Downham (1977) for the choice of a time series model. As have many other authors, including Geisser & Eddy (1979) and McClave (1978), Bhansali & Downham assessed their criteria by the frequency of choice of the correct model. One purpose of the present note is to suggest that this. may not be an appropriate basis for choice: the objectives of the analysis need more explicit formulation. A similar point is made by Akaike (1979) who com- pares values of ot on the basis of squared prediction error. His simulation is, however, un- informative about the conditions under which various values of a are optimum. In this note a simple example is simulated to investigate the taxonomy of optimum of values for prediction purposes. For simplicity of structure and ease of simulation we work with linear regression models, for which the information criterion reduces to a generalized Cp statistic. The behaviour of this statistic as a function of ot is investigated in the next section. Significance testing and Bayesian alternatives are discussed in ? 3. Section 4 is concerned with asymptotics. The note closes with some general comments which allude to ridge regression and simulation." @default.
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• W1973464501 title "A note on the generalized information criterion for choice of a model" @default.
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• W1973464501 doi "https://doi.org/10.1093/biomet/67.2.413" @default.
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