Find out how analytics, from data mining to cognitive computing, is changing the way we do business

## A quantile definition for skewness

Skewness is a measure of the asymmetry of a univariate distribution. I have previously shown…

Find out how analytics, from data mining to cognitive computing, is changing the way we do business

By Rick Wicklin 0

Skewness is a measure of the asymmetry of a univariate distribution. I have previously shown…

By Rick Wicklin 1

A SAS customer asked how to use SAS to conduct a Z test for the…

By Rick Wicklin 2

Most numerical optimization routines require that the user provides an initial guess for the solution.…

By Rick Wicklin 0

In a previous article, I showed two ways to define a log-likelihood function in SAS.…

By Rick Wicklin 1

Maximum likelihood estimation (MLE) is a powerful statistical technique that uses optimization techniques to fit…

By Rick Wicklin 2

According to Hyndman and Fan ("Sample Quantiles in Statistical Packages," TAS, 1996), there are nine…

By Rick Wicklin 0

In last week's article about the Flint water crisis, I computed the 90th percentile of…

By Rick Wicklin 8

The April 2017 issue of Significance magazine features a cover story by Robert Langkjaer-Bain about…

By Rick Wicklin 10

A frequently asked question on SAS discussion forums concerns randomly assigning units (often patients in…

By Rick Wicklin 0

Most SAS regression procedures support a CLASS statement which internally generates dummy variables for categorical…