diff --git a/basis/math/statistics/statistics-docs.factor b/basis/math/statistics/statistics-docs.factor
index 15d8f3f22b..835fddc558 100644
--- a/basis/math/statistics/statistics-docs.factor
+++ b/basis/math/statistics/statistics-docs.factor
@@ -128,7 +128,7 @@ HELP: sorted-histogram
 
 HELP: sequence>assoc
 { $values
-    { "seq" sequence } { "map-quot" { $quotation "( x -- x' )" } } { "insert-quot" { $quotation "( x' assoc -- )" } } { "exemplar" "an exemplar assoc" }
+    { "seq" sequence } { "map-quot" { $quotation "( x -- ..y )" } } { "insert-quot" { $quotation "( ..y assoc -- )" } } { "exemplar" "an exemplar assoc" }
     { "assoc" assoc }
 }
 { $description "Iterates over a sequence, allowing elements of the sequence to be added to a newly created " { $snippet "assoc" } ". The " { $snippet "map-quot" } " gets passed each element from the sequence. Its outputs are passed along with the assoc being constructed to the " { $snippet "insert-quot" } ", which can modify the assoc in response." }
@@ -143,7 +143,7 @@ HELP: sequence>assoc
 
 HELP: sequence>assoc!
 { $values
-    { "assoc" assoc } { "seq" sequence } { "map-quot" { $quotation "( x -- x' )" } } { "insert-quot" { $quotation "( x' assoc -- )" } }
+    { "assoc" assoc } { "seq" sequence } { "map-quot" { $quotation "( x -- ..y )" } } { "insert-quot" { $quotation "( ..y assoc -- )" } }
 }
 { $description "Iterates over a sequence, allowing elements of the sequence to be added to an existing " { $snippet "assoc" } ". The " { $snippet "map-quot" } " gets passed each element from the sequence. Its outputs are passed along with the assoc being constructed to the " { $snippet "insert-quot" } ", which can modify the assoc in response." }
 { $examples
@@ -156,7 +156,7 @@ HELP: sequence>assoc!
 
 HELP: sequence>hashtable
 { $values
-    { "seq" sequence } { "map-quot" { $quotation "( x -- x' )" } } { "insert-quot" { $quotation "( x' assoc -- )" } }
+    { "seq" sequence } { "map-quot" { $quotation "( x -- ..y )" } } { "insert-quot" { $quotation "( ..y assoc -- )" } }
     { "hashtable" hashtable }
 }
 { $description "Iterates over a sequence, allowing elements of the sequence to be added to a newly created hashtable. The " { $snippet "map-quot" } " gets passed each element from the sequence. Its outputs are passed along with the assoc being constructed to the " { $snippet "insert-quot" } ", which can modify the assoc in response." }
diff --git a/basis/math/statistics/statistics.factor b/basis/math/statistics/statistics.factor
index 93b42d659b..455332dfb8 100644
--- a/basis/math/statistics/statistics.factor
+++ b/basis/math/statistics/statistics.factor
@@ -58,18 +58,18 @@ IN: math.statistics
 
 <PRIVATE
 
-: (sequence>assoc) ( seq map-quot: ( x -- x' ) insert-quot: ( x' assoc -- ) assoc -- assoc )
+: (sequence>assoc) ( seq map-quot: ( x -- ..y ) insert-quot: ( ..y assoc -- ) assoc -- assoc )
     [ swap curry compose each ] keep ; inline
 
 PRIVATE>
 
-: sequence>assoc! ( assoc seq map-quot: ( x -- x' ) insert-quot: ( x' assoc -- ) -- assoc )
+: sequence>assoc! ( assoc seq map-quot: ( x -- ..y ) insert-quot: ( ..y assoc -- ) -- assoc )
     4 nrot (sequence>assoc) ; inline
 
-: sequence>assoc ( seq map-quot: ( x -- x' ) insert-quot: ( x' assoc -- ) exemplar -- assoc )
+: sequence>assoc ( seq map-quot: ( x -- ..y ) insert-quot: ( ..y assoc -- ) exemplar -- assoc )
     clone (sequence>assoc) ; inline
 
-: sequence>hashtable ( seq map-quot: ( x -- x' ) insert-quot: ( x' assoc -- ) -- hashtable )
+: sequence>hashtable ( seq map-quot: ( x -- ..y ) insert-quot: ( ..y assoc -- ) -- hashtable )
     H{ } sequence>assoc ; inline
 
 : histogram! ( hashtable seq -- hashtable )