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Exclusion criteria: incomplete survey (defined as failure to answer questions in part 2, regarding hot aches) and duplicate surveys from the same individual determined using IP address and information from part 1.
Duplicate surveys were excluded.
In the few cases of duplicate surveys, such as when flight attendants completed a mailed survey and another survey from the on-site airport distribution, we accepted only the mailed survey returned by the flight attendant.
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Unique passwords were assigned to prevent duplicate survey entries from a single participant.
Non-respondents received a duplicate survey 30 days after the initial mailing with no additional incentive.
Data were analysed for the whole study population, after duplicate survey submissions had been removed, and by gender.
The initial mailout was followed 2 weeks later by a thank you/reminder letter, and 6 weeks later by a duplicate survey package to non-respondents.
Data analysts will check for any double data entries/duplicate surveys by screening participant ID numbers for duplicated surveys at the same time point, keeping only the survey responses that correspond to the later/completed survey in case an individual experienced website reloading and survey resetting.
With some lawmakers worried that the new approach might duplicate other surveys or violate citizens' privacy by asking new questions, census officials and their allies hope this kind of useful detail will help them sell the idea.
We have also set up a public ratings system at Skeptical Science where anybody can duplicate our survey.
We employed a duplicate diet survey to quantify daily As intake in 47 women residing in Pabna, Bangladesh.
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CEO of Professional Science Editing for Scientists @ prosciediting.com