fix: fix negative total tolerance for m3

Alvaro-Kothe · Alvaro-Kothe · commit 59ffa923e2a8 · 2025-09-21T15:46:12.000-03:00
diff --git a/pandas/core/nanops.py b/pandas/core/nanops.py
@@ -1278,7 +1278,7 @@ def nanskew(
     #
     # #18044 in _libs/windows.pyx calc_skew follow this behavior
     # to fix the fperr to treat m2 <1e-14 as zero
-    constant_tolerance = np.finfo(m2.dtype).eps * total
+    constant_tolerance = np.finfo(m2.dtype).eps * np.abs(total)
     constant_tolerance2 = constant_tolerance**2  # match order of m2
     constant_tolerance3 = constant_tolerance2 * constant_tolerance  # match order of m3
     m2 = _zero_out_fperr(m2, constant_tolerance2)

Original file line number	Diff line number	Diff line change
`@@ -1278,7 +1278,7 @@ def nanskew(`
`1278`	`1278`	`#`
`1279`	`1279`	`# #18044 in _libs/windows.pyx calc_skew follow this behavior`
`1280`	`1280`	`# to fix the fperr to treat m2 <1e-14 as zero`
`1281`		`- constant_tolerance = np.finfo(m2.dtype).eps * total`
	`1281`	`+ constant_tolerance = np.finfo(m2.dtype).eps * np.abs(total)`
`1282`	`1282`	`constant_tolerance2 = constant_tolerance**2 # match order of m2`
`1283`	`1283`	`constant_tolerance3 = constant_tolerance2 * constant_tolerance # match order of m3`
`1284`	`1284`	`m2 = _zero_out_fperr(m2, constant_tolerance2)`