[Q] looking for a specific term about bias in a study
i remember learning about this bias in school but for the love of me i cant remember or find what its called.
here how it was explained to me.
if i make a study and want to know how much of the population drink on the regular. during the sample collection i go on the street and ask people about their drinking habit in one spot it could be bias because of the environment.
obvious example would be me being in front of a bar. obviously people who go to the bar are more likely to drink alcohol making for bad data
less obviously but for the same bias. if im in front of a sea food store i might not be aware of a correlation between seafood and alcoholism(fictional example i don't know about that) this would taint my data.
other less obvious example if im in front of a trekking mountain people who go trekking might drink less.
every search im making bring me to participation bias but i know its not quit the same.
context why im looking into this?
i have a theory that most data about pitbull being agressive is skewed by the owners. any dog owner who would create an agressive dog will look into breed like pitbull gsd or other scary looking dog. so looking at the pitbull population as a whole is like if i made my study in front of a dog fighting club. making the sample useless.