So, an example. This is the recent Virta Health trial that has attracted so much attention. If you aren't familiar with the research, you can find it here: https://link.springer.com/article/10.1007%2Fs13300-018-0373-9 …pic.twitter.com/X5SUDmYmdw
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We know that people under-report their food intake to medical professionals This is not surprising. No one likes to admit to their doctor that they aren't following the diet they're supposed topic.twitter.com/7MMFIzIlGe
But, AND THIS IS IMPORTANT, this reporting bias impacts every single person in the study in a similar way Thus, it shouldn't impact the results, except to potentially make them seem LESS meaningful than they actually are
If someone is bashing a piece of research, take a look at their arguments and think: "Is this really going to influence the results?" "Will it impact all groups equally?" "WHAT impact will it have?" These are all vital questions to answer
They are also important for you yourself if you want to know more about the research and its usefulness
This has been my brief thread on bias. If anyone's interested, let me know and I'll do another on different sources of bias or expand on this one
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