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

## Symbolic derivatives in SAS

Did you know that you can get SAS to compute symbolic (analytical) derivatives of simple…

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

By Rick Wicklin 1

Did you know that you can get SAS to compute symbolic (analytical) derivatives of simple…

By Rick Wicklin 3

Correlation is a fundamental statistical concept that measures the linear association between two variables. There…

By Rick Wicklin 0

Visualizing the correlations between variables often provides insight into the relationships between variables. I've previously…

By Rick Wicklin 0

When someone refers to the correlation between two variables, they are probably referring to the…

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 2

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…