Technical data of a survey

The technical specifications or technical data from a survey is a description, brief but compendious, the most important factors relating to the way it was done the same. It is important to remember that opinion polls is a social research, or rather a part of a process of social research, and as such is the correct application of certain scientific methods and validated a theoretical knowledge.
In particular, the data sheet, usually seen in a recuadrito or a footnote in the report with the results of the survey provides information on the time of the survey data (when people were surveyed), the period if it was during the weekend or on weekdays (this, we shall see, can be very important) in what place, how the respondents were selected and what was the total population on which the survey.
This is because, for example, the results of a survey of adolescents can be very different if the survey is administered to adolescents in a city that would be obtained if you apply to the entire adult population of that city, that very probably have a different view on the issue, and even different from the results that may shed a survey of adolescents in the country.
The sheet reveals the methodology that was carried on the survey data and, if this was done with the appropriate technical rigor, these procedures should yield similar results if we repeat the data collection work under the same guidelines. Public and replicable This is typical of scientific knowledge.
That a work is not that a sheet is a good reason to have some caution about its reliability.