Author Archives: phewson

Motorcycle fatalities in the GB (excluding Wales)

(Sorry Wales, I just haven’t figured a way of sorting out the population histories given the local government reorganizations that went with Devolution)     These two figures show Lexis diagrams for (a) the number of reported motorcycle fatalities in … Continue reading

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Lexis Diagrams for Road Injuries

This is based on the crude road injury rate (all injuries), and a reconstructed population up to 90 for England and Scotland from 1985 to the end of 2014.   The colors show the injury rate (per capita), for all … Continue reading

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Barnard’s views on statistical education (from

I really enjoy reading Deborah Mayo’s blog.   I don’t really understand enough about the underlying philosophy – and even gently reading about ideas such as Popper asking for severe challenges (rather than out and out falsifiability) bring this home. … Continue reading

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Regression notation

Aaargh.   A A R G H. I like David Freedman’s book on Statistical Modelling.   I like it a lot, and I particularly like the clarity.   It’s very clear that is a population parameter, a fixed but unknown constant (OK, so … Continue reading

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Developing code

The wonder of the blogosphere is that I rediscovered a paper I had been meaning to think about for a long time: the paper reports Cook, Gelman and Rubin’s proposals that we: Specify a model and then simulate parameters from … Continue reading

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Emerging thoughts on the Poisson as a limit of the Binomial

I am trying to set down some thoughts on the relationship between the Binomial and the Poisson. The specific problem emerges from modelling data where I assume and . The specific problem is that I assume that  and  are correlated in … Continue reading

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Python Notebook

It has been a busy year, for various reasons. However, one loose end that urgently needs tidying up are an assortment of bits and pieces relating to the use of python as a computing language. Somewhere during the year the … Continue reading

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