Bias

A preference in favor of or against a person, group of people, or thing

Data bias

A type of error that systematically skews results in a certain direction

Unbiased sampling

When a sample is a representative of the population being measured

Sampling bias

When a sample isn't representative of the population as a whole

Observer bias (experimenter bias/ research bias)

The tendency for different people to observe things differently

Interpretation bias

The tendency to always interpret ambiguous situations in a positive or negative way

Confirmation bias

The tendency to search for or interpret information in a way that confirms pre-existing beliefs

What is good data?