---
title: "Sample Sizes and Margins of Error"
description: "This analysis is based on aggregated data from more than 84,000 interviews with registered voters conducted by the Pew Research Center for the People & the Press in 54 surveys completed between January 2008 and December 2011. These surveys are combined into one large data file that can be sorted according to a range of […]"
date: "2012-02-02"
authors:
  - name: "Joseph Liu"
    job_title: "Guest Contributor"
url: "https://www.pewresearch.org/religion/2012/02/02/trends-in-party-identification-of-religious-groups-appendix/"
---

# Sample Sizes and Margins of Error

This analysis is based on aggregated data from more than 84,000 interviews with registered voters conducted by the Pew Research Center for the People & the Press in 54 surveys completed between January 2008 and December 2011. These surveys are combined into one large data file that can be sorted according to a range of demographic and religious characteristics. The tables below show the number of interviews and corresponding margins of error for 2008 and 2011 for the groups analyzed in this report.

![partyid-app-1](https://assets.pewresearch.org/wp-content/uploads/sites/11/2012/07/partyid-app-1.jpg)

![partyid-app-2](https://assets.pewresearch.org/wp-content/uploads/sites/11/2012/07/partyid-app-2.jpg)