Do you have any references for this, my good man? I don't mean to question your comment; I want to learn more about how this has been established and the nature of it.
I don't have any references to academic research, but my own experience interviewing people supports the claim. When presented with a simple coding problem, some people just breeze through it, others take most of the interview to finish it, and some candidates just can't solve it at all.
To the extent to which coding on a whiteboard is an indicator of real-world productivity, there definitely seems to be at least 5x difference.
To the extent to which coding on a whiteboard is an indicator of real-world productivity, there definitely seems to be at least 5x difference.