Collected as part of a survey. Typical questions could ask the extent to which respondents agreed or disagreed with the following statements:
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I have taken part in a social event with someone from [insert name of an opposing group] within the previous month.
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I have taken part in a business transaction with someone from [insert name of an opposing group] within the previous month
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I would not object if - when they were of the right age - my child married someone from [insert name of an opposing group].
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If I had a choice I would not choose to work with people from [insert name of an opposing group]
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I trust people from [insert name of an opposing group]
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I trust people who have different religious values to me
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I trust people who have different political affiliations to me
For analysis a simpe percentage should be taken of the number of respondents reporting that they agree or strongly agree with the statement. Care should be taken in deciding whether this percentage applies to just those surveyed or whther it can be ascribed to the population as a whole. This will depend on the design of the survey and whether it was a representative sample of the population.