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correct fourth moment calculation for total randomization null #391

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Merged
martinfleis merged 2 commits into from
Sep 29, 2025
Merged

correct fourth moment calculation for total randomization null #391

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5626e64
fix submitted in #390 by @katterrina
ljwolf Sep 23, 2025
a5e2a39
fix test for #390
ljwolf Sep 23, 2025
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2 changes: 1 addition & 1 deletion esda/moran.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1404,7 +1404,7 @@ def __moments(self):
# ---------------------------------------------------------
# Total randomization null, Sokal 1998, Eqs. A3 & A4*
# ---------------------------------------------------------
m4 = z**4 / n
m4 = (z**4).sum() / n
b2 = m4 / m2**2

expectation = -wi / (n - 1)
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20 changes: 10 additions & 10 deletions esda/tests/test_moran.py
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Original file line number Diff line number Diff line change
Expand Up @@ -587,16 +587,16 @@ def test_local_moments(self, w):
EI = -np.ones((10,)) / 9
VI = np.array(
[
0.47374172,
0.47356458,
0.47209663,
0.15866023,
0.15972526,
0.47376436,
0.46927721,
0.24584217,
0.26498308,
0.47077467,
0.394432,
0.394432,
0.394432,
0.148043,
0.148043,
0.394432,
0.394432,
0.230173,
0.230173,
0.394432,
]
)

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