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StatsMiniBlog: Rasch Analysis
Yes. You’re right. I have spelt ‘rash’ wrongly and yes, there are many very very bad puns which can come from this title. But you may have seen, occasionally, Rasch analysis as a thing on scientific...
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StatsMiniBlog: Factor Analysis
It’s another one of those things that you’ll see in a paper, often followed by the word “eigenvalue” and shudder, perhaps externally as well as internally. The’ll be a follow-up of ‘structure’ or the...
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StatsMiniBlog: Value of Information
When there’s a limited pot of money to do research with, it would be sensible to put it where it might do the most good, wouldn’t it? Well that’s exactly what the ‘value of information’ framework...
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StatsMiniBlog: Trial Sequential Analysis
You might have seen this “Trial Sequential Analysis” in the odd systematic review or meta-analysis, and seen some strange graphs with ‘cumulative z-score boundaries’ in them. And then either quickly...
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StatsMiniBlog: Middling differences
Is there a difference between these two non-parametric groups? (For example, the duration of cough after bronchiolitis…) Time to cough resolution (days) Rx A: Median 15 days Rx B: Median 15...
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StatsMiniBlog: Path analysis
It’s been a while since a little burst of statistical fun hit the blogosphere but summer is sort of here, and you may be faced with a choice of tracks in a forest and unsure which one to take … Path...
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StatsMiniBlog: Pants and primary schools.
I’ve been struggling to get the concept behind random-effects meta-analysis out for some time – it’s the ‘average effectiveness’ in an ‘average population’ – with the prediction interval being the...
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MiniStatsBlog: Making decisions from numbers
It’s a thing we like to do in medicine – make decisions on the basis of numbers. The temperature is greater than 38C in a neutropenic child? Start antibiotics. The CRP in your snuggly neonate has...
View ArticleSpirals of re-validation
In the UK, revalidation, to the eyes of anyone in a permanent post, brings thoughts of GMC pleasing e-paperwork and the joy of yet more hours staring at a barely functional system to prove you are safe...
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Signal, noise, chance and chancers
For those who hold to personalised medicine as the future of therapeutics, the case is made that it’s about identifying the ones who will gain from the ones who don’t. Separating the signal from the...
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