The sample increases will be implemented over the next few years. In 2014, five LPM markets – Dallas, Washington, D.C, Houston, Miami and Denver – will have 200 extra homes added to their panels, while New York, Los Angeles and a further eight markets will see increases in 2015. On average, sample sizes will go up by 30%.

In the set-meter markets, meanwhile, each panel will get an extra 200 homes over the next two years – which equates to an almost 50% increase in sample size.