Count the spots: parents should not have to

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Last year there was a surge of measles in England and Wales and already this year health authorities in South Wales and the north east of England are reporting spikes in cases of a disease that had been on its way out – thanks to the success of the MMR vaccine says NHS Choices.
 
A causal link can’t definitively be made with the Wakefield case in 1998 and the way, then and since certain media – notoriously the Daily Mail –  have campaigned against immunization. But rates of vaccination did slip, probably because parents had read and believed reports linking MMR to autism.  There’s more here about the disease.

Spinning the statistics, again

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We’ve been here before, but that doesn’t make the pain of statistical abuse any lighter.
 
A government, down in the polling dumps, gets anxious to extol its policies. It seizes eagerly on any sign they are working. Temptation looms, in the shape of exaggerating or, as some would say, actively misinterpreting data.

Statisticians always see the wood (and the trees)

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Statisticians
Statisticians may sometimes seem over-meticulous and detail-obsessed, but if anyone can see the wood for the trees, it’s them. By checking through detail, they are really just bringing everything together so that they can look at the big picture.
 
At the weekend, in an interview on Radio 4 the ONS’s chief economist Joe Grice said that the ‘did it/didn’t it?’ debate around the UK and double dip recessions was “counter productive” and that we’d all do better to worry less about shorter-term figures “whether one particular quarter was up a smidgen or down a smidgen” and instead stay focused on the big picture  and the general direction of trends in the economy over time.
 

A gold mine of personality data?

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Twitter
There seems to be no end to the potential for Statistics to harvest the internet – blogs, tweets, e-mails – to find patterns in our innermost thoughts and emotions and to understand what makes us tick as humans. Think back to the Joy of Stats and the vast ‘madness movement’ map which analysed our digital traces and unwrapped what ‘mankind’ is feeling at any given time.
 
What might be an everyday way of using this knowledge? In their bid to match customers to products and services, marketeers are seeking new sources of intelligence and it seems that social media - a mine of big and valuable data - and until now mainly a tool for informing consumers about new products and services, is a good place to start.
 

Take predictions with a pinch of salt, forecasts with a measure of uncertainty

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This morning’s Radio 4 Today programme included an interview with Nate Silver, the statistician and analyst renowned for predicting the most recent US election results via models based on electoral history, demographics and polling. He correctly called all 50 states in the US Presidential election. His stock is now very high and he is viewed by many as the go-to predictor in the political arena. But he is determined not to be misunderstood or considered infallible. Indeed, he very humbly forecast his own future ‘unravelling’. As numbers go up and down and failure follows success, he could also see that, at some point in the future, he will, undoubtedly, get things wrong, maybe even very wrong.
 
The interview focused quite a bit on the distinction between predicting and forecasting. Nate encouraged us not to trust anybody who is too confident in their predictions, especially long-term predictions. Predicting the economy more than 3-6 months ahead is ”nearly impossible”.  Political pundits have been found to have no more than a 50-50 chance of turning out to be correct, most do no better at predicting election results, than if they had just flipped a coin.

When correlation is just for fun

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Correlation
We’re not all statisticians but we are all, to some extent, programmed to reason statistically. In a bid to make sense of the world around us, we compare, contrast, look for patterns and are drawn to a statistical technique called correlation, a way of measuring the extent to which a change in one measurable thing – a ‘variable’ – is associated with the change in another measurable thing.
 
Indeed, you can calculate the correlation between pretty much any two things which can be quantified, counted and measured. But Statistics doesn’t operate as a set of techniques, its value is in providing insight into a problem, so if you are going to calculate correlations it makes sense for there to be some reason for doing it i.e. because you want to take action of some kind.  SO there’s no point in looking for correlation between things which aren’t measurable such as eye colour and personality traits, or others which are clearly connected e.g. breast cancer and wearing skirts?. Or between entirely random things such as how many tatoos someone has and the amount of jam they eat each week. Any connection, mirroring or linearity found has to be down to chance. ’Findings’ here won’t tell you anything useful.
 

Introducing the UK Data Service

Written by Oz Flanagan on . Posted in Features

Open data
For social scientists, there have traditionally been a number of sources from which to get economic, government and census data. Now there is a new online resource which promises to put all of these sources into one place. Simon Briscoe, who serves on its governing board, reports.

The UK Data Service is a new initiative which offers a single access point to a wide range of social and economic data. The new body came into existence at the end of last year and its visible face, the website, went live this month.

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