Department of Labor Logo United States Department of Labor
Dot gov

The .gov means it's official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you're on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Calling Effort and Nonresponse for Telephone Panel Surveys

Roberta L. Sangster


Over several years, I have been working with issues related to RDD (Random Digit Dialed) generated telephone survey panels and attrition rate calculations. For this study, I examine how nonworking numbers, noncontacts (basically answering machines, scheduled callbacks, and ring-no-answer numbers impact the number of completed interviews across time and also the amount of effort involved to contact the telephone numbers based on the number of call attempts. The analysis presented in this paper is only descriptive, no statistical tests are used. Opinions and errors are the sole responsibility of the author and do not represent opinions of the Bureau of Labor Statistics.