There’s this trick that climate deniers used to use. They used to say “there’s been no warming since 1998”. And in a weird way they were right: looking at global atmospheric surface temperatures, none of the years that followed was as hot as 1998.
But they were cheating. They picked 1998 deliberately since it was an outlier – an El Niño year much hotter than the years around it. If you were, on the other hand, to measure from 1997 or 1999, then there were lots of much hotter years on record; and the clear trend was that later years, on average, were hotter than earlier ones. It was a wobbly, noisy line, with some outliers, but the average temperature really was going up, and the only way you could hide that trend was by cherry-picking statistics.
I was thinking about this as I read the Sunday Times splash this week, which (using as-yet unavailable data from the Office for National Statistics) claimed that the “suicide rate among teenagers has nearly doubled in eight years”. It expressed concerns that we are raising “a suicidal generation”.
They said that the suicide rate among 15- to 19-year-olds in 2010 was just over three per 100,000. The ONS figures, due out in September, will (apparently) show that it is now over five per 100,000. Inevitably enough, the piece links the purported rise to the growth of social media since 2010.
But this is – and I don’t want to get too technical here, but bear with me – absolute bollocks from top to bottom. It’s a masterclass in what scientists call “hypothesising after results are known”, or HARKing. If you have the data in front of you, then you can make it say almost anything you like.
First, it’s worth noting that very few teenagers kill themselves. The total number of suicide deaths among 15- to 19-year-olds in 2017 in England and Wales was 177, out of about 3.25 million. That means that small changes can look like big percentage swings. More important, though, the Sunday Times story did exactly what the climate deniers did. The year 2010 had the lowest rate of teen suicides of any year since at least 1981, when the ONS records begin. You could compare it with literally any other year and you’d see a rise.
Join the discussion
Join like minded readers that support our journalism by becoming a paid subscriber
To join the discussion in the comments, become a paid subscriber.
Join like minded readers that support our journalism, read unlimited articles and enjoy other subscriber-only benefits.
Subscribe