Multiple regression can help eliminate internal validity problems by
1. potential third variables. It also sets a
2. variable that acts as the independent variable, or the variable that will influence another variable; and a
3. variable that acts as a dependent variable, or the variable that is hypothesized to be affected by another variable. Effect sizes in multiple-regression analyses are represented by
4., which is a standardized effect size, and
5., which is an unstandardized effect size.