Validating surveys reliability validity

There are different forms of research validity and main ones are specified by Cohen et al (2007) as content validity, criterion-related validity, construct validity, internal validity, external validity, concurrent validity and face validity.Measures to ensure validity of a research include, but not limited to the following points: a) Appropriate time scale for the study has to be selected; b) Appropriate methodology has to be chosen, taking into account the characteristics of the study; c) The most suitable sample method for the study has to be selected; d) The respondents must not be pressured in any ways to select specific choices among the answer sets.

This is particularly important with achievement tests.

It is a reliable test (high scores relate to high GPA), though only a moderately valid indicator of success (due to the lack of structured environment – class attendance, parent-regulated study, and sleeping habits – each holistically related to success).

Second, validity is more important than reliability.

Using the above example, college admissions may consider the SAT a reliable test, but not necessarily a valid measure of other quantities colleges seek, such as leadership capability, altruism, and civic involvement.

The combination of these aspects, alongside the SAT, is a more valid measure of the applicant’s potential for graduation, later social involvement, and generosity (alumni giving) toward the alma mater.

Finally, the most useful instrument is both valid and reliable. It is a moderately reliable predictor of future success and a moderately valid measure of a student’s knowledge in Mathematics, Critical Reading, and Writing.