Hi,

>From R documentation, the default alternative hypothesis for moran.test in spdep is "greater" which leads me to think that the null hypothesis is then "less than or equal to zero" or no or negative autocorr.  A small p-value for this test would indicate a rejection of the null and support for positive spatial autocorrelation as measured by Moran's I.  Is this correct so far?

Geary's C stat as calculated by geary.test has a default alt. hypothesis "greater" as well.  However, the expected value for Geary's C is 1 and values below this indicates positive autocorrelation and values above 1 indicate negative autocorrelation.  So, it seems the null as a default is "less than or equal to 1" (positive or no autocorr).  A small p-value would then indicate support for negative autocorrelation.  Is this correct?

If I am reading the documentation correctly and asking an obvious question, I am sorry.  It is confusing to me because I would expect the default alternative hypotheses of the two tests to have p-values with similar interpretations.

Thanks, Seth


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