fix issue 414. Replace broken link

Author: PaulWestenthanner

category_encoders/backward_difference.py

@@ -71,7 +71,7 @@ class BackwardDifferenceEncoder(BaseContrastEncoder):
     https://stats.idre.ucla.edu/r/library/r-library-contrast-coding-systems-for-categorical-variables/
 
     .. [2] Gregory Carey (2003). Coding Categorical Variables, from
-    http://psych.colorado.edu/~carey/Courses/PSYC5741/handouts/Coding%20Categorical%20Variables%202006-03-03.pdf
+    http://ibgwww.colorado.edu/~carey/p5741ndir/Coding_Categorical_Variables.pdf
 
     """
 

category_encoders/base_contrast_encoder.py

@@ -41,7 +41,7 @@ class BaseContrastEncoder(util.BaseEncoder, util.UnsupervisedTransformerMixin):
     https://stats.idre.ucla.edu/r/library/r-library-contrast-coding-systems-for-categorical-variables/
 
     .. [2] Gregory Carey (2003). Coding Categorical Variables, from
-    http://psych.colorado.edu/~carey/Courses/PSYC5741/handouts/Coding%20Categorical%20Variables%202006-03-03.pdf
+    http://ibgwww.colorado.edu/~carey/p5741ndir/Coding_Categorical_Variables.pdf
 
     """
     prefit_ordinal = True

category_encoders/helmert.py

@@ -72,8 +72,8 @@ class HelmertEncoder(BaseContrastEncoder):
     https://stats.idre.ucla.edu/r/library/r-library-contrast-coding-systems-for-categorical-variables/
 
     .. [2] Gregory Carey (2003). Coding Categorical Variables, from
-    http://psych.colorado.edu/~carey/Courses/PSYC5741/handouts/Coding%20Categorical%20Variables%202006-03-03.pdf
-
+    http://ibgwww.colorado.edu/~carey/p5741ndir/Coding_Categorical_Variables.pdf
+    
     """
     def get_contrast_matrix(self, values_to_encode: np.array) -> ContrastMatrix:
         return Helmert().code_without_intercept(values_to_encode)

category_encoders/one_hot.py

@@ -86,8 +86,8 @@ class OneHotEncoder(util.BaseEncoder, util.UnsupervisedTransformerMixin):
     https://stats.idre.ucla.edu/r/library/r-library-contrast-coding-systems-for-categorical-variables/
 
     .. [2] Gregory Carey (2003). Coding Categorical Variables, from
-    http://psych.colorado.edu/~carey/Courses/PSYC5741/handouts/Coding%20Categorical%20Variables%202006-03-03.pdf
-
+    http://ibgwww.colorado.edu/~carey/p5741ndir/Coding_Categorical_Variables.pdf
+    
     """
     prefit_ordinal = True
     encoding_relation = util.EncodingRelation.ONE_TO_N_UNIQUE

category_encoders/ordinal.py

@@ -77,8 +77,7 @@ class OrdinalEncoder(util.BaseEncoder, util.UnsupervisedTransformerMixin):
     https://stats.idre.ucla.edu/r/library/r-library-contrast-coding-systems-for-categorical-variables/
 
     .. [2] Gregory Carey (2003). Coding Categorical Variables, from
-    http://psych.colorado.edu/~carey/Courses/PSYC5741/handouts/Coding%20Categorical%20Variables%202006-03-03.pdf
-
+    http://ibgwww.colorado.edu/~carey/p5741ndir/Coding_Categorical_Variables.pdf
     """
     prefit_ordinal = False
     encoding_relation = util.EncodingRelation.ONE_TO_ONE

category_encoders/polynomial.py

@@ -71,8 +71,8 @@ class PolynomialEncoder(BaseContrastEncoder):
     https://stats.idre.ucla.edu/r/library/r-library-contrast-coding-systems-for-categorical-variables/
 
     .. [2] Gregory Carey (2003). Coding Categorical Variables, from
-    http://psych.colorado.edu/~carey/Courses/PSYC5741/handouts/Coding%20Categorical%20Variables%202006-03-03.pdf
-
+    http://ibgwww.colorado.edu/~carey/p5741ndir/Coding_Categorical_Variables.pdf
+    
     """
     def get_contrast_matrix(self, values_to_encode: np.array) -> ContrastMatrix:
         return Poly().code_without_intercept(values_to_encode)

category_encoders/sum_coding.py

@@ -71,7 +71,7 @@ class SumEncoder(BaseContrastEncoder):
     https://stats.idre.ucla.edu/r/library/r-library-contrast-coding-systems-for-categorical-variables/
 
     .. [2] Gregory Carey (2003). Coding Categorical Variables, from
-    http://psych.colorado.edu/~carey/Courses/PSYC5741/handouts/Coding%20Categorical%20Variables%202006-03-03.pdf
+    http://ibgwww.colorado.edu/~carey/p5741ndir/Coding_Categorical_Variables.pdf
 
     """