Posts tagged "David Spiegelhalter"

Before believing a study look at it's methodology

Before believing a study take a look at its methodology

April 12, 2019 Posted by Excerpts 0 thoughts on “Before believing a study take a look at its methodology”

For example, in 2017 budget airline Ryanair announced that 92% of their passengers were satisfied with their flight experience. It turned out that their satisfaction survey only permitted the answers, ‘Excellent, very good, good, fair, OK’.

Excerpt from: The Art of Statistics: Learning from Data by David Spiegelhalter

In our keenness to attribute success or failure to an intervention, we often forget that the change may well be a case of reversion to the mean

In our keenness to attribute success or failure to an intervention, we often forget that the change may well be a case of reversion to the mean

April 10, 2019 Posted by Excerpts 0 thoughts on “In our keenness to attribute success or failure to an intervention, we often forget that the change may well be a case of reversion to the mean”

It is not only sports teams that are ranked in league tables. Take the example of the PISA Global Education Tables, which compare different countries’ school systems in mathematics. A change in league table position between 2003 and 2013 was strongly negatively correlated with initial position, meaning that countries at the top tended to go down, and those at the bottom tended to go up. The correlation was -0.60, and some theory shows that if the rankings were complete chance and all that was operating were regression-to-the-mean, the correlation would be expected to be -0.71, not very different from what was observed. This suggest the differences between countries were far less than claimed, and that change in league position had little do with changes in teaching philosophy.

Excerpt from: The Art of Statistics: Learning from Data by David Spiegelhalter

The Art of Statistics: Learning from Data

The Art of Statistics: Learning from Data

April 8, 2019 Posted by 0 thoughts on “The Art of Statistics: Learning from Data”

The Art of Statistics: Learning from Data

The Art of Statistics: Learning from Data

By David Spiegelhalter

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