The media coverage of the results of the local elections (in May 2019) has at times been deeply misleading with voting outcomes not being accurately described. The problem is two-fold. First, the usual way of presenting the figures – in terms of seats, percentage share of the vote and swings – can give a very misleading impression. It has on this occasion as the usual metrics have been distorted by the plummeting turnout compared to 2015 (when the turnout was high due to the General Election). No one single summary statistic can be relied upon in all circumstances. Second, it is nigh on impossible to get the actual voting figures. The country deserves a central publication point for election data to allow anyone to do their own, neutral, assessment of the trends. The time has come for the UK to have more transparency about its election results – surely one of the most fundamental of all statistics – as befits a developed democracy. Without this, the voters are unlikely to get a fair sense of the results given much of the interpretation is being done by politicians or columnists skilful enough to select their factoids to suit their own story or others who are innumerate, wilfully or naively ignorant of the facts, or producing projections from black box models.
The ONS and its governing board, UKSA, does not lie but on migration their statements stretch credibility and do nothing to boost public trust in data. The ONS needs to change its stock press briefing that the passenger survey is “the best available source” for migration data. It is true but only because it does not seek a better source. It’s like telling a cancer patient that an x-ray is best when we know the (more expensive) scan is better – it might help at the margin in some cases but it’s not what’s needed. It is damaging to give such a deeply misleading impression of the data’s veracity. For the same reason, the ONS needs to stop publishing confidence intervals on migration data.
The UKSA needs to say it as it is – migration numbers are not fit for purpose and a new system (and more money) is needed to collect decent numbers. Brexit will require better data so UKSA would no longer be saying anything radical. Pretending that the figures are OK is not only a failure of its regulatory duty but provides cover for a Home Office that really needs to get on with what’s required – the not so tricky job of counting people crossing borders. Continue reading ONS: Time to be frank on migration
Response rates to surveys are declining. Fast. New sources, such as big data or administrative data, or making survey response compulsory, are no longer an optional extra. They need to be discussed now as a way to boost the quality of and restore credibility to the nation’s key figures. The rise in employment and the fall in earnings defined the economy of the last Parliament. As survey response rates fall below 50%, there is a chance that those trends which never gelled to give a coherent picture are some way from reality.