Missing Values
n Missing values are an issue in a substantial
number of statistical analyses.
n For example, in the case of surveys, rarely do
missing values occur completely at random.
n When nonrespondents differ systematically from
respondents, adjusting for nonresponse may be
required.

© 2008 by the Rector and Visitors of the University of Virginia.

The information contained on the University of Virginia’s Department of Information Technology and Communication (ITC) website is provided as a public service with the understanding that ITC makes no representations or warranties, either expressed or implied, concerning the accuracy, completeness, reliability or suitability of the information, including warrantees of title, non-infringement of copyright or patent rights of others. These pages are expected to represent the University of Virginia community and the State of Virginia in a professional manner in accordance with the University of Virginia’s Computing Policies.