When you select Automatic, the gradient type depends on the calculation of the Pearson correlation coefficients.
If the coefficients are positive and negative, the Gradient
type is Diverging
symmetric around 0.
If the coefficients are all positive, the Gradient
type is Sequential from
low to high.
If the coefficients are all negative, the Gradient
type is Sequential from
high to low.
Diverging
symmetric around 0
Rectangles with high values are red, and rectangles with low values are blue. The middle of the scale is centered at 0.
Sequential from
low to high
Rectangles with high values are dark blue, and rectangles with low values are light blue and light gray. You can use this option to highlight variables with a strong positive relationship.
Sequential from
high to low
Rectangles with low values are dark blue, and rectangles with high values are light blue and light gray. You can use this option to highlight variables with a strong negative relationship.