Posts Tagged ‘ Statistical Programming ’

Simultaneous confidence intervals for a multivariate mean

December 7, 2016
By
Simultaneous confidence intervals for a multivariate mean

Many SAS procedure compute statistics and also compute confidence intervals for the associated parameters. For example, PROC MEANS can compute the estimate of a univariate mean, and you can use the CLM option to get a confidence interval for the population mean. Many parametric regression procedures (such as PROC GLM)

The post Read more »

Tags: ,
Posted in SAS | Comments Off on Simultaneous confidence intervals for a multivariate mean

Loess regression in SAS/IML

October 19, 2016
By
Loess regression in SAS/IML

A previous post discusses how the loess regression algorithm is implemented in SAS. The LOESS procedure in SAS/STAT software provides the data analyst with options to control the loess algorithm and fit nonparametric smoothing curves through points in a scatter plot. Although PROC LOESS satisfies 99.99% of SAS users who

The post Read more »

Tags: , ,
Posted in SAS | Comments Off on Loess regression in SAS/IML

Compute nearest neighbors in SAS

September 14, 2016
By
Compute nearest neighbors in SAS

Finding nearest neighbors is an important step in many statistical computations such as local regression, clustering, and the analysis of spatial point patterns. Several SAS procedures find nearest neighbors as part of an analysis, including as PROC LOESS, PROC CLUSTER, PROC MODECLUS, and PROC SPP. This article shows how to

The post Read more »

Tags: , , ,
Posted in SAS | Comments Off on Compute nearest neighbors in SAS

How to visualize a kernel density estimate

July 27, 2016
By
How to visualize a kernel density estimate

A kernel density estimate (KDE) is a nonparametric estimate for the density of a data sample. A KDE can help an analyst determine how to model the data: Does the KDE look like a normal curve? Like a mixture of normals? Is there evidence of outliers in the data? In

The post Read more »

Tags: , ,
Posted in SAS | Comments Off on How to visualize a kernel density estimate

Use the EFFECTPLOT statement to visualize regression models in SAS

June 22, 2016
By
Use the EFFECTPLOT statement to visualize regression models in SAS

Graphs enable you to visualize how the predicted values for a regression model depend on the model effects. You can gain an intuitive understanding of a model by using the EFFECTPLOT statement in SAS to create graphs like the one shown at the top of this article. Many SAS regression

The post Read more »

Tags: , , ,
Posted in SAS | Comments Off on Use the EFFECTPLOT statement to visualize regression models in SAS

How to fit a variety of logistic regression models in SAS

May 23, 2016
By

SAS software can fit many different kinds of regression models. In fact a common question on the SAS Support Communities is "how do I fit a <name> regression model in SAS?" And within that category, the most frequent questions involve how to fit various logistic regression models in SAS. There

The post Read more »

Tags: , ,
Posted in SAS | Comments Off on How to fit a variety of logistic regression models in SAS

Rolling statistics in SAS/IML

February 3, 2016
By

Last week I showed how to use PROC EXPAND to compute moving averages and other rolling statistics in SAS. Unfortunately, PROC EXPAND is part of SAS/ETS software and not every SAS site has a license for SAS/ETS. For simple moving averages, you can write a DATA step program, as discussed

The post Read more »

Tags: , , ,
Posted in SAS | Comments Off on Rolling statistics in SAS/IML

Banking to 45 degrees: Aspect ratios for time series plots

January 20, 2016
By
Banking to 45 degrees: Aspect ratios for time series plots

In SAS, the aspect ratio of a graph is the physical height of the graph divided by the physical width. Recently I demonstrated how to set the aspect ratio of graphs in SAS by using the ASPECT= option in PROC SGPLOT or by using the OVERLAYEQUATED statement in the Graph

The post Read more »

Tags: , ,
Posted in SAS | Comments Off on Banking to 45 degrees: Aspect ratios for time series plots

Welcome!

SAS-X.com offers news and tutorials about the various SAS® software packages, contributed by bloggers. You are welcome to subscribe to e-mail updates, or add your SAS-blog to the site.

Sponsors





Dear readers, proc-x is looking for sponsors who would be willing to support the site in exchange for banner ads in the right sidebar of the site. If you are interested, please e-mail me at: tal.galili@gmail.com
SAS and all other SAS Institute Inc. product or service names are registered trademarks or trademarks of SAS Institute Inc. in the USA and other countries. ® indicates USA registration.