Wednesday, 14 March 2012

Hack rape stats shocker!!! (Journalistic misuse of statistics – Part 1)



From time to time I stumble across an article that so thoroughly abuses statistics, I feel compelled to write something down. I spotted an excellent case in point in the Metro on 28th February.


Here’s a summary:

The title proclaims: Serial rapists ‘stay free because of failures by police and prosecutors’. The title sets the scene. After reading this title I am expecting an expose on the failures of law in the UK and horror stories of serial rapists stalking the streets. Pretty gripping stuff!

The subtitle embellishes this with “Serial rapists may be escaping justice because of a raft of failures by police and prosecutors, a damning report claims.” Currently we are still very much on the theme of expose and serial rapist terror.

We enter the body of the text and statistics start being bandied about:

Their attacks go unrecorded because as many as three in ten reported rapes are written off as if no crime ever took place, the investigation reveals.” This sentence states that as many as 3 in 10 rapes are assigned as ‘no crime’ committed. The use of the emotive words ‘as many as’ and ‘as if no crime ever took place’ gives the impression that this is a scandal. I have no idea if this is a scandal or not. I have nothing to compare this statistic to. The language informs me that a scandal has taken place rather than the meaningless statistic.

“Figures showed almost 12 per cent of rape cases in 2010 ended with police ruling no crime had been committed compared with just three per cent of GBH cases.A few sentences later we are presented the national statistic of less than 12% of rape cases assigned as ‘no crime’ committed. This is much lower than the 30% rate that was quoted above. Why the drop? This is cleared up in the following sentence:

“In Kent, the figure was 30 per cent although it was just 2.4 per cent in Gloucestershire.” It appears that rather than using the larger, more accurate data set at the start of the article the reporter cherry picked the biggest number to sensationalize. This latest comparison begs the question ‘Why is there such a difference in
‘no crime’ judgements between Gloucestershire and Kent?’ The question remains unanswered.

More than one in ten of these decisions were wrong, according to an analysis of at least 100 such ‘no crimes’, the report says.Wait one second! This statistic shows 1 in 10 of the rape cases assigned as ‘No crime’ is incorrect. So of the 12% of rape cases assigned as ‘No crime’ nationally, 1.2% are incorrectly assigned. We have dropped from 30% in the first sentence of the article to 1.2%. This is disguised through confusing words. It definitely did not jump out at me. I read the text several times to decipher the conflicting stories being told by the statistics and the text.

“Interpol record checks on rapes abroad ‘were not regularly conducted’, even though they can identify a pattern of offending.” This sentence is the justification for the serial rapists. The incidence of serial rape by foreigners in the UK would have been interesting line of enquiry. As it stands the article gives no clue as to the size of this problem. The title persuades us towards the seriousness of the issue. The data gives us too little information to refute the titles proclamation.

Journalism as weak as this is undermines the story that it tells. Without clear facts about a story how can a serious dialogue develop? A quick scan of Wikipedia and related articles on the internet gives a sense that there are serious issues with rape convictions in the UK. A home office study in 2005 states some facts we know about rape:

Since the age of 16, 7 per cent of women had suffered a serious sexual assault at least once in their lifetime (5% had been raped).

The paper reports an estimated annual incidence rate of 47,000 adult female victims of rape.’

“Home Office figures show an on-going decline in the conviction rate for reported rape cases, putting it at an all-time low of 5.6 per cent in 2002.”

A number of studies have found high rates of ‘no criming’

These are serious issues. Unfortunately Metro and Nick Herbert haven’t provided the facts, clarity or dialogue to support the cause.

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