why does a linear residual have parallel lines why do we find parallel lines of residual lines why are parallel lines used on regression why would you use a parallel plot for a residual vs fitted model why would you use a regression model in a regression plot why do we have parallel lines on residuals compared to fitted plots why does a residual vs fitted plot have parallel lines which graph shows the parallel lines between residuals and fitted plots? why parallel lines on a residual vs fitted plot what is parallel lines in regression why does a regression show parallel lines what is parallel lines why does a linear regression always show parallel lines why are parallel lines in regression? why is regression plot parallel do linear regression lines show up in regression analysis? what type of regression model is used to model a residual plot why does a residual plot need to be parallel why would we have parallel lines on a regression why do a linear regression and parallelline plots work