{"id":111342,"date":"2021-09-30T16:23:00","date_gmt":"2021-09-30T21:23:00","guid":{"rendered":"https:\/\/alpha.pewresearch.org\/pewresearch-org\/decoded\/\/\/validating-2020-voters-in-pew-research-centers-survey-data\/"},"modified":"2024-04-14T04:10:28","modified_gmt":"2024-04-14T09:10:28","slug":"validating-2020-voters-in-pew-research-centers-survey-data","status":"publish","type":"decoded","link":"https:\/\/alpha.pewresearch.org\/pewresearch-org\/decoded\/2021\/09\/30\/validating-2020-voters-in-pew-research-centers-survey-data\/","title":{"rendered":"Validating 2020 voters in Pew Research Center\u2019s survey data"},"content":{"rendered":"\n
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Pew Research Center illustration<\/figcaption><\/figure>\n\n\n\n

(Related post: <\/em>Validating 2016 voters in Pew Research Center\u2019s survey data<\/em><\/a>)<\/em><\/p>\n\n\n\n

Knowing who voted is critical to developing an accurate understanding of the outcome of an election. But self-reports of voting tend to be somewhat unreliable<\/a>. Fortunately, surveys asking about voting can be made more accurate by validating respondents\u2019 self-reported turnout with official voting records.<\/p>\n\n\n\n

Today, Pew Research Center is releasing an updated version of its 2020 post-election survey dataset<\/a> that includes validated measures of turnout in the 2020, 2018 and 2016 U.S. general elections, along with a special weight for use with these variables. We validated turnout by attempting to locate an official turnout record for each of the members of the Center\u2019s American Trends Panel<\/a> (ATP) \u2014 our nationally representative survey panel of U.S. adults \u2014 in at least one of three commercial databases. These publicly available turnout records are compiled by the states and the District of Columbia as part of their routine administration of elections. Commercial vendors then make the information available to political parties, campaigns and researchers. In this post, we\u2019ll discuss the measures and what you can do with the dataset in more detail.<\/p>\n\n\n\n

This dataset is the basis for a report we issued on June 30<\/a> about the characteristics of the 2020 electorate, including those who voted and those who did not. The dataset is available as an SPSS statistics file (with the file extension .sav) and is accompanied by a ReadMe.txt file with information about the computation of the turnout variables. All major statistical software packages can read SPSS files, but at the end of this blog post we offer some suggestions for how you can use a free package to analyze the data.<\/p>\n\n\n\n

As a reminder, Pew Research Center releases nearly all of its raw survey datasets<\/a> to the public. It usually takes a period ranging from a few months to more than a year after collection to release a dataset. This delay allows the Center\u2019s staff to fully analyze and report on the data, as well as to clean and anonymize the files to protect respondents from the risk of being personally identified. All data for release<\/a> can be found on our website. Users are asked to register for an account, after which they can download and manage datasets as often as desired.<\/p>\n\n\n\n

How validated voters are defined<\/h3>\n\n\n\n

To validate turnout among members of the ATP, we attempted to link panel members to a turnout record in at least one of three commercial voter files: one that serves conservative and Republican organizations and campaigns, one that serves progressive and Democratic organizations and campaigns, and one that is nonpartisan.<\/p>\n\n\n\n

A member of the ATP is considered to be a voter for a given election if they told us they voted and were recorded as having voted in at least<\/em> one of the three commercial voter files. Those who said they did not vote in a given election are considered nonvoters. Additionally, nonvoters include anyone \u2014 regardless of their self-reported vote \u2014 for whom a record of voting could not be found in any of the three commercial voter files. That includes respondents who were not <\/em>matched in any of the three files. We assumed this last group were not registered voters and therefore had not voted.<\/p>\n\n\n\n

(Note: Because of a law passed in 2018, Utah residents can opt to keep their voter registration and vote history data private. Therefore, we could not assume that the absence of a voting record meant that a Utah panelist is a nonvoter. Consequently, Utah residents in the American Trends Panel are considered to be voters if they reported having voted when asked in the post-election survey.)<\/em><\/p>\n\n\n\n

Overall, we matched 97% of our voting-eligible panelists to at least one of these files and located a 2020 turnout record (or self-report in the case of Utah) for 9,668 panelists. Panelists who could not be matched or for whom no 2020 turnout record could be located were considered to be validated nonvoters (1,477 panelists).<\/p>\n\n\n\n

For additional details about the voter file matching and voter verification process, see Pew Research Center\u2019s report on the 2020 electorate<\/a> and this report<\/a> on how voter files are used to study U.S. politics.<\/p>\n\n\n\n

How this dataset can be used<\/h3>\n\n\n\n

The dataset Pew Research Center is releasing today will allow users to replicate or extend portions of the analysis presented in our June report on the 2020 election. Specifically, it is intended to allow users to analyze the 2020 electorate and those who turned out in the 2020 general election. Users can also examine 2018 and 2016 turnout and vote choice among<\/em> those who participated in the 2020 survey.<\/p>\n\n\n\n

This dataset cannot be used to replicate the analysis presented in the Center\u2019s reports on either the 2018<\/a> or 2016<\/a> elections, or the data from those reports that is included in the 2020 report\u2019s detailed tables<\/a> and discussed in the study. The 2018 and 2016 reports were based on post-election surveys conducted in the weeks after the two elections and voter validations conducted several months later. Those surveys did not include people who joined the panel in subsequent years. Consequently, they are not directly comparable to results from the 2020 post-election survey and its voter validation.<\/p>\n\n\n\n

For panelists in the 2020 survey who were not in the panel in 2018 or 2016, their turnout in the earlier elections is coded based on the presence or absence of turnout records for the relevant elections in the three voter files obtained this year for the 2020 validation. Similarly, vote choice among these voters is based on retrospective measures asked in surveys taken after they joined the panel. For the 2020 panelists who participated in the 2018 or 2016 surveys, turnout is coded based on voter validations conducted following those elections, and their vote choice was measured in post-election surveys in those years.<\/p>\n\n\n\n

The variables of interest<\/h3>\n\n\n\n

The dataset includes seven new variables:<\/p>\n\n\n\n