Don’t let data lead you astray
A decision this week by Parkrun, the folk behind the free 5km runs that take place up and down the UK each Saturday, reminded me of Donald Rumsfeld’s famous 2002 statement about “known knowns, known unknowns, and unknown unknowns.” Having clarity about what you do and don’t know is a priceless thing when it comes to assessing data and making decisions based upon it.