BUG: robust.norms.TrimmedMean fix typos in psi_deriv closes #425

statsmodels · Aug 5, 2013 · d66364a · d66364a
1 parent ad95288
commit d66364a
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/statsmodels/robust/norms.py b/statsmodels/robust/norms.py
@@ -555,15 +555,15 @@ def weights(self, z):
         test = self._subset(z)
         return test
 
-    def psi_derive(self, z):
+    def psi_deriv(self, z):
         """
         The derivative of least trimmed mean psi function
 
         Notes
         -----
         Used to estimate the robust covariance matrix.
         """
-        test = self.subzet(z)
+        test = self._subset(z)
         return test
 
 class Hampel(RobustNorm):