Editing Measurement (section)

=== Survey research ===
{{Main|Survey methodology }}
[[File:EMMA experiment.jpg|thumb|Measurement station C of EMMA experiment situated at the depth of 75 meters in the [[Pyhäsalmi Mine]]]]
In the field of survey research, measures are taken from individual attitudes, values, and behavior using [[questionnaire]]s as a measurement instrument. As all other measurements, measurement in survey research is also vulnerable to [[Observational error|measurement error]], i.e. the departure from the true value of the measurement and the value provided using the measurement instrument.<ref>{{cite book | last = Groves | first = Robert | title = Survey Methodology | publisher = Wiley | location = New Jersey | year = 2004 | isbn = 9780471483489 | url = https://archive.org/details/surveymethodolog00robe | url-access = registration}} "By measurement error we mean a departure from the value of the measurement as applied to a sample unit and the value provided. "  pp. 51–52 .</ref> In substantive survey research, measurement error can lead to biased conclusions and wrongly estimated effects. In order to get accurate results, when measurement errors appear, the results need to be [[Correction for attenuation|corrected for measurement errors]].