The study found there was a positive link between good information technology and national test results, of 0.07 under the Spearman Rank Correlation statistical measurement system.

BBC: Books 'best for tests'

The new Northern Ireland Composite Economic Index (NICEI) will now be used as the closest approximate measurement for GDP in Northern Ireland drawing on the various statistical sources that currently exist.

BBC: New figures measure NI's output for first time

We develop a statistical framework that uses lights growth to augment existing income growth measures, under the assumption that measurement error in using observed light as an indicator of income is uncorrelated with measurement error in national income accounts.

FORBES: Celebrate Earth Hour By Turning the Lights *On*