Cumulative distribution function - Wikipedia, the free encyclopedia
Cumulative distribution function for the normal distributions in the image below. Probability density function for several normal distributions. The red line denotes .
http://en.wikipedia.org/wiki/Cumulative_distribution_function
Logistic distribution - Wikipedia, the free encyclopedia
In probability theory and statistics, the logistic distribution is a continuous probability distribution. Its cumulative distribution function is the logistic function, which .
http://en.wikipedia.org/wiki/Logistic_distribution
The Probability Density and Cumulative Distribution Functions
The Probability Density and Cumulative Distribution Functions. Designations. From probability and statistics, given a continuous random variable X, we denote: .
http://www.weibull.com/LifeDataWeb/the_probability_density_and_cumulative_distribution_functions.htm