statistical-significance/

Each month the U.S. Bureau of Labor Statistics releases its Employment Situation report. This report includes about two dozen distinct datasets that can help economists, journalists and the public understand the health of the nation’s economy. It’s where to find monthly changes to the number of people employed and the unemployment rate, and it’s a report that’s widely covered in the media, but isn’t always covered with much context.

If you’re a journalist, you might feel more comfortable with words than numbers. If you’re reading this, you might also be interested in research, which, more often than not, involves math — usually statistics. One of the more important statistical concepts used in interpreting research is effect size,  a measure of the strength of an association between two variables — say, an intervention to encourage exercise and the study outcome of blood pressure reduction.