1: Weighted linear combinations means that each variable has a different weight: the factor/component loading that determines how much or little each variable contributes to the composite. This is similar to multiple regression where a variable score is composed of different amounts (regression weights) of each variable in the equation. [return]

2: Please note, there is one other extraction method, principal components analysis. There are also two additional extraction options to recognize and perform analyses on a set of scoring coefficients or a factor pattern matrix. [return]

3: We put that in quotation marks because most researchers reporting results from an EFA fail to do any replication at all. [return]