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Model selection methods

Raftery (1986) [304] Comment to Grusky and Hauser (1984) [170]. Properties of LR test when $n$ is large. BIC proposed instead, favours quasi-symmetry model for the data of [170].

Hout and Raftery (1988) [192] (A CASMIN conference paper). BIC to address the large-$N$ problem. Example (from [Hauser (1984)]): $N=14 258$ French and English men, class of origin, destination, country; homogenous quasi-symmetry model selected. Other model selection problems discussed: sparse tables and zero counts; nonnested models (e.g. continuous scales vs. nominal levels) and combining them; mathematical vs. verbal formulation of models and hypotheses.

Davis (1990) [105] Survey of sample sizes in leading sociological journals. Role of $N$ in significance testing. Discussion of (and formulas for) $CN$, the sample size for which the observed effect would be exactly significant at a given level.

Raftery (1995) [307] Bayesian model selection for sociological audience. Problems with standard hypothesis tests: $p$-values with large $n$ and in multiple comparisons; selection from many (possibly nonnested) competing models; model uncertainty. Bayesian approach to these; derivation of BIC, examples of specific types of models, choice of `$n$', interpretation and relation to p-values. Data of Grusky and Hauer (1984) [170] used as example of model selection in very large data sets. Bayesian model averaging. Discussion in [156] and [182], rejoinder in [308].

Gelman and Rubin (1995) [156] Discussion of Raftery (1995) [307]. Mostly critical: argues that BIC attempts to provide rationale for selecting a model which does not fit. In his rejoinder, Raftery [308] comments that this is based on use of LR tests to decide which model `fits' and misunderstanding of the prior implied by BIC. G & S argue for the distinction between statistical and practical significance, i.e. whether a model is acceptable depends also on the intended purposes to which it is to be used. In general, G & S de-emphasise model selection, preferring complex models (embedding the main choices in a flexible class of models), collection of further data (to make selection easier) and, sometimes, model averaging.

Hauser (1995) [182] Discussion of Raftery (1995) [307]. Very positive. Discussion of large-$n$ model selection problems in Grusky and Hauser (1984) [170] and the BIC resolution of them in Raftery (1986) [304]. Further examples of the use of BIC in sociological modelling. Recommendations for universal acceptance of BIC.

Weakliem (1998) [] Criticism of BIC for sociological audience. Main points: (i) BIC implies (best approximates) a BF with a certain prior, which may or may not be sensible; (ii) the `sample size' $n$ in BIC is not well defined, should be amount of information in the sample but this is not easy to define. Many other comments and suggested modifications to BIC.


next up previous contents
Next: Examples: models for social Up: Model selection in Sociological Previous: Model selection in Sociological   Contents
Jouni Kuha 2003-07-16