An opinion poll, often simply referred to as a survey or a poll, is a human research survey of public opinion from a particular sample. Opinion polls are usually designed to represent the opinions of a population by conducting a series of questions and then extrapolating generalities in ratio or within confidence intervals. A person who conducts polls is referred to as a pollster.
History The first known example of an opinion poll was a tally of voter preferences reported by the Raleigh Star and North Carolina State Gazette and the Wilmington American Watchman and Delaware Advertiser prior to the 1824 presidential election, showing Andrew Jackson leading John Quincy Adams by 335 votes to 169 in the contest for the United States presidency. Since Jackson won the popular vote in that state and the national popular vote, such straw votes gradually became more popular, but they remained local, usually citywide phenomena.
In 1916, The Literary Digest embarked on a national survey (partly as a circulation-raising exercise) and correctly predicted Woodrow Wilson's election as president. Mailing out millions of postcards and simply counting the returns, The Literary Digest also correctly predicted the victories of Warren Harding in 1920, Calvin Coolidge in 1924, Herbert Hoover in 1928, and Franklin Roosevelt in 1932.
Then, in 1936, its survey of 2.3 million voters suggested that Alf Landon would win the presidential election, but Roosevelt was instead re-elected by a landslide. George Gallup's research found that the error was mainly caused by participation bias; those who favored Landon were more enthusiastic about returning their postcards. Furthermore, the postcards were sent to a target audience who were more affluent than the American population as a whole, and therefore more likely to have Republican sympathies. At the same time, Gallup, Archibald Crossley and Elmo Roper conducted surveys that were far smaller but more scientifically based, and all three managed to correctly predict the result. The Literary Digest soon went out of business, while polling started to take off. Roper went on to correctly predict the two subsequent reelections of President Franklin D. Roosevelt. Louis Harris had been in the field of public opinion since 1947 when he joined the Elmo Roper firm, then later became partner.
In September 1938, Jean Stoetzel, after having met Gallup, created IFOP, the Institut Français d'Opinion Publique, as the first European survey institute in Paris. Stoetzel started political polls in summer 1939 with the question "Why die for Danzig?", looking for popular support or dissent with this question asked by appeasement politician and future collaborationist Marcel Déat.
Gallup launched a subsidiary in the United Kingdom that was almost alone in correctly predicting Labour's victory in the 1945 general election: virtually all other commentators had expected a victory for the Conservative Party, led by wartime leader Winston Churchill. The Allied occupation powers helped to create survey institutes in all of the Western occupation zones of Germany in 1947 and 1948 to better steer denazification. By the 1950s, various types of polling had spread to most democracies.
Viewed from a long-term perspective, advertising had come under heavy pressure in the early 1930s. The Great Depression forced businesses to drastically cut back on their advertising spending. Layoffs and reductions were common at all agencies. The New Deal furthermore aggressively promoted consumerism, and minimized the value of (or need for) advertising. Historian Jackson Lears argues that "By the late 1930s, though, corporate advertisers had begun a successful counterattack against their critics." They rehabilitated the concept of consumer sovereignty by inventing scientific public opinion polls, and making it the centerpiece of their own market research, as well as the key to understanding politics. George Gallup, the vice president of Young and Rubicam, and numerous other advertising experts, led the way. Moving into the 1940s, the industry played a leading role in the ideological mobilization of the American people in fighting the Nazis and the Japanese in World War II. As part of that effort, they redefined the "American Way of Life" in terms of a commitment to free enterprise. "Advertisers", Lears concludes, "played a crucial hegemonic role in creating the consumer culture that dominated post-World War II American society."Jean M. Converse," Survey Research in the United States: Roots and Emergence 1960 (1987) pp: 114-24
Sample and polling methods Opinion polls for many years were maintained through telecommunications or in person-to-person contact. Methods and techniques vary, though they are widely accepted in most areas. Over the years, technological innovations have also influenced survey methods such as the availability of electronic clipboardsG. Rowley, K. Barker, V. Callaghan (1986) “The Market Research Terminal & Developments in Survey Research”, European Journal of Marketing, Vol. 20 Issue: 2, pp.35 - 39. and Internet based polling.
Opinion polling developed into popular applications through popular thought, although response rates for some surveys declined. Also, the following has also led to differentiating results: Some polling organizations, such as Angus Reid Public Opinion, YouGov and Zogby use Internet surveys, where a sample is drawn from a large panel of volunteers, and the results are weighted to reflect the demographics of the population of interest. In contrast, popular web polls draw on whoever wishes to participate.
Statistical learning methods have been proposed in order to exploit social media content (such as posts on the micro-blogging platform Twitter) for modelling and predicting voting intention polls.Brendan O'Connor, Ramnath Balasubramanyan, Bryan R Routledge, and Noah A Smith. From Tweets to Polls: Linking Text Sentiment to Public Opinion Time Series. In Proceedings of the International AAAI Conference on Weblogs and Social Media. AAAI Press, pp. 122–129, 2010.
Benchmark polls A benchmark poll is generally the first poll taken in a campaign. It is often taken before a candidate announces their bid for office, but sometimes it happens immediately following that announcement after they have had some opportunity to raise funds. This is generally a short and simple survey of likely voters. Benchmark polling often relies on timing, which can be a significant problem if a poll is conducted too early for anyone to know about the potential candidate. A benchmark poll needs to be undertaken when voters are starting to learn more about the possible candidate running for office.
A benchmark poll serves a number of purposes for a campaign. First, it gives the candidate a picture of where they stand with the electorate before any campaigning takes place. If the poll is done prior to announcing for office the candidate may use the poll to decide whether or not they should even run for office. Secondly, it shows them where their weaknesses and strengths are in two main areas. The first is the electorate. A benchmark poll shows them what types of voters they are sure to win, those they are sure to lose, and everyone in-between these two extremes. This lets the campaign know which voters are persuadable so they can spend their limited resources in the most effective manner. Second, it can give them an idea of what messages, ideas, or slogans are the strongest with the electorate.Kenneth F. Warren (1992). "in Defense of Public Opinion Polling." Westview Press. p. 200-1.
Tracking polls In a tracking poll responses are obtained in a number of consecutive periods, for instance daily, and then results are calculated using a moving average of the responses that were gathered over a fixed number of the most recent periods, for example the past five days. In this example, the next calculated results will use data for five days counting backwards from the next day, namely the same data as before, but with the data from the next day included, and without the data from the sixth day before that day.
However, these polls are sometimes subject to dramatic fluctuations, and so political campaigns and candidates are cautious in analyzing their results. An example of a tracking poll that generated controversy over its accuracy, is one conducted during the 2000 U.S. presidential election, by the Gallup Organization. The results for one day showed Democratic candidate Al Gore with an eleven-point lead over Republican candidate George W. Bush. Then, a subsequent poll conducted just two days later showed Bush ahead of Gore by seven points. It was soon determined that the volatility of the results was at least in part due to an uneven distribution of Democratic and Republican affiliated voters in the samples. Though the Gallup Organization argued the volatility in the poll was a genuine representation of the electorate, other polling organizations took steps to reduce such wide variations in their results. One such step included manipulating the proportion of Democrats and Republicans in any given sample, but this method is subject to controversy.
Deliberative opinion polls Deliberative Opinion Polls combine the aspects of a public opinion poll and a focus group. These polls bring a group of voters and provide information about specific issues. They are then allowed to discuss those issues with the other voters. Once they know more about the issues, they are polled afterward on their thoughts. Many scholars argue that this type of polling is much more effective than traditional public opinion polling. Unlike traditional public polling, deliberative opinion polls measure what the public believes about issues after being offered information and the ability to discuss them with other voters. Since voters generally do not actively research various issues, they often base their opinions on these issues on what the media and candidates say about them. Scholars argued that these polls can truly reflect voters' feelings about an issue once they are given the necessary information to learn more about it. Despite this, there are two issues with deliberative opinion polls. First, they are expensive and challenging to perform since they require a representative sample of voters, and the information given on specific issues must be fair and balanced. Second, the results of deliberative opinion polls generally do not reflect the opinions of most voters since most voters do not take the time to research issues the way an academic researches issues.
Exit polls Exit polls interview voters just as they are leaving polling places. Unlike general public opinion polls, these are polls of people who voted in the election. Exit polls provide a more accurate picture of which candidates the public prefers in an election because people participating in the poll did vote in the election. Second, these polls are conducted across multiple voting locations across the country, allowing for a comparative analysis between specific regions. For example, in the United States, exit polls are beneficial in accurately determining how the state voters cast their ballot instead of relying on a national survey. Third, exit polls can give journalists and social scientists a greater understanding of why voters voted the way they did and what factors contributed to their vote.