likert

likert: "The standard deviation can be used as a measure of consistency.
A pattern like the completely polarized one has the highest standard deviation. The highest possible standard deviation achievable for a 5-point scale on 1,2,3,4,5 is given by the distribution {.5,0,0,0,.5}; the value of sigma for this distribution is 2. As a rough guide, 5-point Likert scale response distributions with sigma less than 1 could be called consistent; with sigma more than 1, inconsistent."