## Bureau international des poids et mesures

**T**oday, I am taking part in a meeting in Paris, for an exotic change!, at the Bureau international des poids et mesures (BIPM), which looks after a universal reference for measurements. For instance, here is its definition of the kilogram:

The unit of mass, the kilogram, is the mass of the international prototype of the kilogram kept in air under three bell jars at the BIPM. It is a cylinder made of an alloy for which the mass fraction of platinum is 90 % and the mass fraction of iridium is 10 %.

And the BIPM is thus interested in the uncertainty associated with such measurements. Hence the workshop on measurement uncertainties. Tony O’Hagan will also be giving a talk in a session that opposes frequentist and Bayesian approaches, even though I decided to introduce ABC as it seems to me to be a natural notion for measurement problems (as far as I can tell from my prior on measurement problems).

June 15, 2015 at 5:23 pm

Very interesting, I like the part where machine learning is proposed for model selection. Can you recommend any paper where this subject is discussed?

Merijn Mestdagh

June 15, 2015 at 9:48 pm

I have written a paper about using random forests for ABC model choice, discussed on the ‘Og many many times….

June 16, 2015 at 1:46 pm

Thanks!