Today I ran into a word: genotype likelihood. Probability and likelihood are two concepts that are usually a mixtures in people’s heads.
Probability = What is the chance of this outcome, given a model or known parameters? P(D∣θ) Likelihood = How plausible is this model (or parameter value), given the data I observed? L(θ∣D)
Therefore probabilies are used in simulating from known models, and likelihood is used in inferring model parameters from observed data (what we are doing most of the time).