There are, strictly speaking, various types of opinion polls and attitudes registration.
But if we analyze the different types of surveys in processes for the collection of data we can distinguish three major types of survey: staff survey, the self-administered survey and telephone survey.
From now on, we must clarify, we are talking about surveys that apply to people or survey investigating the opinions and attitudes of individuals.
Discussed in this post the individual survey.
The personal interview is the best known of the three types, and today almost no one living in urban centers has not been sought to answer some.
This is a typical face-to-face survey.
In this type of survey requires a team of trained interviewers who, after receiving an instruction concerning the nature of the survey, how to administer the questionnaire, some problems with certain questions, how to access the survey, should contact the persons elected to be interviewed.
Sometimes when it is a multistage sample survey, the last stage, which involves selecting people who have to answer, is undertaken by the interviewer.
At other times, however, already has the address and name of the person, as when performed on a standard sample, eg a professional society.
It is the task of the interviewer approached the respondent with a structured or semi-structured questionnaire, or with any questions closed or open and closed questions (discuss this later).
One of the methodological issues is often not sufficiently appreciated is that all questions must be made strictly in the order they appear in the questionnaire, in the same tone and, above all, without adding or omitting anything, even a comma in the text survey questionnaire.
This ensures the objectivity of the results from the application of the same stimulus to all respondents. Let's be clear, as always, that these considerations are made on the assumption that the questionnaire is objective and is built by professionals, that the questions measure what they purport to measure, and so on.
Some types of personal opinion polls are coincidental survey, the survey at random or random (or which includes, as recorded at a final stage of sampling a random selection process) and survey fees.
The coincidental survey is a type of non-probability sampling (later we will analyze it), or a sample in which no one knows the error of estimate (we'll explain later) or error resulting from the spread of the sample data population. In the survey, the interviewer takes coincidental random people in a busy city and survey.
It's that simple, as they make bad journalists and pollsters (and political operatives, why deny it), although some research may be used responsibly. In the survey at random or random pollster has a table of random numbers that tells you based on the number of questionnaires to be completed, for example, which household member should interview and may in some cases replace him in case of absence for an individual of the same sex and similar socioeconomic level and age.
Finally, the quota sampling is one in which the interviewer and out of the office of the institute or consultancy or agency with a guideline on how many men interviewed, a few women, what ages, what you already know what you want and crossing is going as the respondent.
As can be seen, the random survey individual may lead to the replacement of absent or rejecting entevistado a fee.
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Opinion surveys Surveys of public opinion and policy surveys. Methodology, theory and analysis of public opinion polls .