Presentation on theme: "Mantel Tests Comparing Distance Matrices. Spatial Autocorrelation Spatial autocorrelation means that observations that are close to one another in space."— Presentation transcript:
Spatial Autocorrelation Spatial autocorrelation means that observations that are close to one another in space are more similar to one another than to other observations farther away –Nearby sites are closer in time –Nearby sites are closer in assemblage composition
Mantel Test Widely used in ecology to compare two distance matrices Correlation is a measure of spatial autocorrelation (pearson, spearman, or kendall’s tau Significance must be determined by permutations of the distance matrix
Example Snodgrass site – does the presence of decorated/prestige artifacts show spatial autocorrelation? Load the data set and convert the variables to dichotomies Compute distance matrices and plot 91*90/2 = 4095 distance pairs
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