WIP

app/controllers/admins_controller.rb

@@ -66,18 +66,7 @@ class AdminsController < ApplicationController
   end
 
   def correlations
-
-
-    @correlations = Statistics.generate_correlations(params[:number_of_weeks])
-
-    5.times.inject({}) do |stats, n|
-      week_start = (Time.now - n.weeks).beginning_of_week
-      week_end = week_start - 1.week
-      stats[week_start] = Statistics.new(week_start, week_end).generate_correlations
-    end
-
-
-
+    @post_count_correlation = Statistics.new.post_count_correlation
   end
 
   private

app/views/admins/_admin_bar.haml

@@ -5,6 +5,7 @@
       %li= link_to 'User Search', user_search_path
       %li= link_to 'Weekly User Stats', weekly_user_stats_path
       %li= link_to 'Pod Stats', pod_stats_path
+      %li= link_to 'Correlations', correlations_path
       - if AppConfig[:mount_resque_web]
         %li= link_to 'Resque Overview', resque_web_path
 

app/views/admins/correlations.haml

@@ -0,0 +1,11 @@
+
+.span-24
+  = render :partial => 'admins/admin_bar.haml'
+%br
+%br
+
+.span-24.last
+  %h1
+    = "Correlation between Post Count and Sign In Count"
+  %ul
+    = @post_count_correlation

config/routes.rb

@@ -97,6 +97,7 @@ Diaspora::Application.routes.draw do
     match :user_search
     get   :admin_inviter
     get   :weekly_user_stats
+    get   :correlations
     get   :stats, :as => 'pod_stats'
   end
 

lib/statistics.rb

@@ -55,15 +55,21 @@ SQL
 SQL
   end
 
-  def posts_count_correlation
+  def post_count_correlation
 
     # [{"id" => 1 , "count" => 123}]
-    post_count_array = User.connection.select_all(self.posts_count_sql)
 
-    post_count_hash = {}
-    post_count_array.each{ |h| post_count_hash[h[id]] = h["count"]}
+    x_array = []
+    y_array = []
 
+    post_count_hash.keys.each do |k| 
+      if val = sign_in_count_hash[k]
+        x_array << post_count_hash[k]
+        y_array << val
+      end
+    end
 
+    correlation(x_array, y_array)
   end
 
 
@@ -93,4 +99,23 @@ SQL
     User.where("username IS NOT NULL").where("created_at > ? and created_at < ?", Time.now - (n+1).weeks, Time.now - n.weeks)
   end
 
+  def post_count_hash
+    unless @post_count_hash
+      post_count_array = User.connection.select_all(self.posts_count_sql)
+
+      @post_count_hash = {}
+      post_count_array.each{ |h| @post_count_hash[h['id']] = h["count"]}
+    end
+    @post_count_hash
+  end
+
+  def sign_in_count_hash
+    unless @sign_in_count_hash
+      sign_in_count_array = User.connection.select_all(self.sign_in_count_sql)
+
+      @sign_in_count_hash = {}
+      sign_in_count_array.each{ |h| @sign_in_count_hash[h['id']] = h["count"]}
+    end
+    @sign_in_count_hash
+  end
 end

spec/lib/statistics_spec.rb

@@ -4,7 +4,8 @@ require 'lib/statistics'
 describe Statistics do
 
   before do
-    @stats = Statistics.new(time, time - 1.week)
+    @time = Time.now
+    @stats = Statistics.new#(@time, @time - 1.week)
     @result = [{"id" => alice.id , "count" => 0 },
                  {"id" => bob.id , "count" => 1 },
                  {"id" => eve.id , "count" => 0 },
@@ -59,11 +60,9 @@ describe Statistics do
   describe "#correlation_hash" do
 
     it 'it returns a hash of including start and end time' do
-      time = Time.now
-
       hash = @stats.correlation_hash
-      hash[:starrt_time].should == time
-      hash[:end_time].should == time - 1.week
+      hash[:starrt_time].should == @time
+      hash[:end_time].should == @time - 1.week
     end
 
     it 'returns the post count (and sign_in_count) correlation' do
@@ -73,6 +72,26 @@ describe Statistics do
     end
   end
   
+  describe "#post_count_correlation" do
+    it 'calls correlation with post' do
+      User.connection.should_receive(:select_all).and_return([{"id"=> 1, "count" => 7},
+                                                            {"id" => 2, "count" => 8},
+                                                            {"id" => 3, "count" => 9}],
+                                                            [{"id"=> 1, "count" => 17},
+                                                            {"id" => 3, "count" => 19}]
+                                                            )
+
+      @stats.should_receive(:correlation).with([7,9],[17,19]).and_return(0.5)
+      @stats.posts_count_correlation.should == 0.5
+    end
+  end
+
+
+
+
+
+
+
   context 'todos' do
     before do
       pending