# Name for derivative of probability density function

I am interested to know if there is a name for the derivative of the density function, maybe written by some author in some textbook.

For example, if $$P(x)$$ is the cumulative distribution function, then the derivative $$P'(x)$$ has a name (which is the density function).

Is there a good name/interpretation for $$P''(x)$$, the second derivative of the cumulative distribution function (or first derivative of density function)? Maybe written in some math/statistics textbook by some author?

I am currently doing a coding project, and I want to give it a good name to the first derivative of density function.

double probCumulative = 0.95
double probDensity = 0.4
double ....goodname?.... = 0.1


Thank you very much.

• Welcome to MSE. Please use MathJax. – José Carlos Santos Sep 18 '17 at 9:57
• probDerivative may be good name ? – alexjo Sep 18 '17 at 10:04