## Sufficient statistics for ABC

**T**he issue of picking quasi-sufficient statistics in ABC algorithms is quite important and Joyce and Marjoram have published (last August, sorry I’m late!) a proposal in Statistical Applications in Genetics and Molecular Biology that is addressing this issue, at least to the extend that the inclusion of a new statistics within the set of summary statistics can be assessed in terms of likelihood ratio. There are difficulties with the method, first and foremost that the construction of the statistics is not discussed, while the method is not independent from parameterisation, and also that the order in which the statistics are considered is determinant for their inclusion/exclusion. A regularisation of the method proposed at the end of the paper is to use a forward-backward selection mechanism. This does not address another issue, namely the impact of the correlation between the summary statistics. Note at last that the method still depends on an approximation factor that needs to be determined by the statistician/experimenter running the algorithm.

February 27, 2012 at 12:13 am

[…] compare regression adjustments à la Beaumont et al. (2002), subset selection methods, as in Joyce and Marjoram (2008), and projection techniques, as in Fearnhead and Prangle (2012). They add to this impressive […]

June 14, 2011 at 12:14 am

[…] a poor selection of summary statistics. This is correct, even though a stepwise ABC estimation à la Marjoram could bring some measure of confidence in the set of summary statistics used for estimation. This […]

December 16, 2009 at 12:06 am

[…] inclusion of diverse statistics, a bit in the spirit of Joyce and Marjoram, discussed in this post. It also considers the impact of testing for the adequacy of a model as testing for the hypothesis […]