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We have a couple studies looking at this exact issue. An experiment by Musgrave and Rom (2015) had polisci students compose two essays, one on the history and beliefs of the Democratic Party and another on the GOP. These were then given to TAs to grade.https://scholar.dickinson.edu/faculty_publications/78/ …
The TAs knew their marking was going to be looked at, and with the first batch of essays they were sent questions about their political partisanship & ideology (should have been done afterwards!). Both those things are real problems (as is the fact they were TAs not full profs).
The questions we asked the TAs were standard survey questions. To misdirect the TAs, we asked them to guess the sex of the students, hoping they would believe the study was about sex bias.
I understand that. But the fact they were being studied at all, & knew it, is a huge confounding variable. Plus, they're presumably not naive. Your misdirection might well have been perceived as precisely that. I'd have realized. I accept, of course, not easy to control all this.
Yeah, this topic is pretty difficult to study. For example....if we were to redo it, addressing the concerns of our critics, we'd have to conceal *our* identify -- so that the subjects wouldn't say "Oh, Rom and @profmusgrave ....they must be studying political bias..."
Yeah, it's really difficult. I don't think your conclusions are necessarily wrong. It's just... you know.
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