Interpreting bivariate Local Moran statistics

The four quadrants in the Moran scatter plot provide a classification of four types of spatial autocorrelation. Areas that are significant are labelled with these categories in the "High-High/Low-Low" dataset produced in the Moran analysis, and are colored in the scatter plot to indicate their category (non significant locations are colored gray). The interpretation will be different for the univariate and bivariate Local Moran.

 

category

scatter plot quadrant and color

 

autocorrelation

 

interpretation

high-high

upper right red

positive

cluster - "I'm high in [ego variable at ego time] and my neighbors are high in [neighbor variable at neighbor time]."

high-low

lower right pink

negative

outlier - "I'm a high outlier in [ego variable at ego time] among low neighbors in [neighbor variable at neighbor time]."

low-low

lower left med. blue

positive

cluster - "I'm low in [ego variable at ego time] and my neighbors are low in [neighbor variable at neighbor time]."

low-high

upper left light blue

negative

outlier - "I'm a low outlier in [ego variable at ego time] among high neighbors in [neighbor variable at neighbor time]."

As stated above, in the Local Moran maps, only those regions with p-values below 0.05 are colored following the high/low coloring scheme described above (see map legend as well). Places with non-significant Local Moran statistics are colored gray, and if there were islands in the dataset they would be shown as missing values because they have no adjacent neighbors.

 

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