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Statistical Glossary

Probit:

Probit is a nonlinear function of probability p:


probit(p) = F-1(p)

where F-1() is the function inverse to the cumulative distribution function F() of the standard normal distribution . In contrast to the probability p itsef (which takes on values from 0 to 1), the values of the probit of p are from minus- to plus-infinity.

For some specific values of p, values of the probit are:



lim
p ® 0 
  probit(p) = -¥;
probit(0.5) = 0;

lim
p ® 1 
  probit(p) = +¥;

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