According to Caffo (2015), ‘Adjustment’ is about understanding how additional variables that are added to a model can distort the other variables. A real world example of this is through an analysis of US Avocado Sales Volume and a linear model predicting total sales volume based on sales volume of Small Hass Avocados (4046), Large Hass Avocados (4225) and Extra Large Hass Avocados (4770).