diff --git a/mj.rb b/mj.rb
index 5cfa284..03d0c37 100644
--- a/mj.rb
+++ b/mj.rb
@@ -13,6 +13,9 @@ class MajorityJudgment
     if arg.is_a?(Array)
       @ratings = arg
       @count = { }
+      self.class.values.each do |v|
+        @count[v[:id]] = 0
+      end
       @n = 0
       ratings.each do |r|
         @count.has_key?(r) ? @count[r] = @count[r] + 1 : @count[r] = 1