diff --git a/.gitignore b/.gitignore
index 7d46220..95f8985 100644
--- a/.gitignore
+++ b/.gitignore
@@ -22,4 +22,5 @@ examples.rb
 json_responses.txt
 
 *.swp
-token.rb
+helper.rb
+test
diff --git a/lib/pcr.rb b/lib/pcr.rb
index f15e176..3218356 100644
--- a/lib/pcr.rb
+++ b/lib/pcr.rb
@@ -27,7 +27,7 @@ def instructor(id)
       raise NotImplementedError.new("Instructors have not yet been implemented.")
     end
 
-    def dept(code)
+    def department(code)
       Department.new code
     end
   end
diff --git a/lib/pcr/coursehistory.rb b/lib/pcr/coursehistory.rb
index 524e0a0..2ea370b 100644
--- a/lib/pcr/coursehistory.rb
+++ b/lib/pcr/coursehistory.rb
@@ -53,6 +53,8 @@ def average(metric)
           end
         end
       end
+
+      return -1 if num == 0
       
       # Return average value across all sections
       total / num
diff --git a/lib/pcr/department.rb b/lib/pcr/department.rb
index 3d0decd..973df02 100644
--- a/lib/pcr/department.rb
+++ b/lib/pcr/department.rb
@@ -6,7 +6,7 @@ class Department
     include PCR::Resource
     attr_reader :name, :coursehistories, :id, :path, :retrieved, :valid, :version
     
-    def initialize(course_code)
+    def initialize(name)
       @name = name
       
       # Read JSON from PCR API
@@ -26,8 +26,11 @@ def average(metric)
       # Aggregate ratings across all coursehistories
       total, num = 0, 0
       coursehistories.each do |c|
-        total += c.average(metric).to_f
-        num += 1
+        av = c.average(metric).to_f
+        if av != -1
+          total += av
+          num += 1
+        end
       end
       
       # Return average value across all sections