Macros to Conduct Tests of Multimodality in SAS

TL;DR

This paper introduces SAS macros for conducting multimodality tests, specifically the Dip Test and Silverman's Test, leveraging SAS's ability to run R code, thus making these tests accessible within SAS environments.

Contribution

The paper provides the first implementation of the Dip and Silverman multimodality tests as SAS macros, enabling users to perform these tests without switching to R.

Findings

Macros successfully perform multimodality tests in SAS

Illustrations demonstrate macro use on Gaussian and iris data

Enhanced accessibility of multimodality testing in SAS environment

Abstract

The Dip Test of Unimodality and Silverman's Critical Bandwidth Test are two popular tests to determine if an unknown density contains more than one mode. While the tests can be easily run in R, they are not included in SAS software. We provide implementations of the Dip Test and Silverman Test as macros in the SAS software, capitalizing on the capability of SAS to execute R code internally. Descriptions of the macro parameters, installation steps, and sample macro calls are provided, along with an appendix for troubleshooting. We illustrate the use of the macros on data simulated from one or more Gaussian distributions as well as on the famous $\textit{iris}$ dataset.