The four-in-one residual plot displays four different residual plots together in one graph window. This layout can be useful for comparing the plots to determine whether your model meets the assumptions of the analysis. The residual plots in the graph include:

·    Histogram - indicates whether the data are skewed or outliers exist in the data

·    Normal probability plot - indicates whether the data are normally distributed, other variables are influencing the response, or outliers exist in the data

·    Residuals versus fitted values - indicates whether the variance is constant, a nonlinear relationship exists, or outliers exist in the data

·    Residuals versus order of the data - indicates whether there are systematic effects in the data due to time or data collection order

To view the interpretation of each residual plot in the four-in-one plot, refer to the individual topic for each residual plot preceding this topic.