yangxu Posted November 11, 2004 Share Posted November 11, 2004 The National AIDS Bahavioral Surveys found that 170 individuals in its random sample of 2673 adult heterosexuals said they had multiple sexual partners in the past year, that's 6.36% of the sample... but my prof said this is biased, my guess is that the survey concerns a sample consists of only adults who are heterosexuals and based this random sample's result to cover all types of sexual preferences for adults in the community... is this a reasonable explanation? Please enlighten me, thanks a lot in advance! Link to comment Share on other sites More sharing options...
Bald Wonder Posted November 12, 2004 Share Posted November 12, 2004 In a study the two major classes of bias are: 1. Selection bias 2. Observation/information (misclassification) bias If the purpose of this study was to determine causes for AIDS in a random population (including homosexuals, blood transfusion recipients, IV Drug abusers, etc.) then this is definitely a case of selection bias. He could also be referring to recall bias, which is the most common type of observation bias in this type of survey. Link to comment Share on other sites More sharing options...
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