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-rw-r--r--app/views/public_body/statistics.html.erb38
1 files changed, 38 insertions, 0 deletions
diff --git a/app/views/public_body/statistics.html.erb b/app/views/public_body/statistics.html.erb
index fc0007d97..840af0c10 100644
--- a/app/views/public_body/statistics.html.erb
+++ b/app/views/public_body/statistics.html.erb
@@ -2,6 +2,44 @@
<div id="main_content">
<h1>Public Body Statistics</h1>
+ <p><%= _("This page of public body statistics is currently \
+experimental, so there are some caveats that should be borne \
+in mind:") %></p>
+
+ <ul>
+
+ <li><%= _("The percentages are calculated with respect to \
+the total number of requests, which includes invalid \
+requests; this is a known problem that will be fixed in a \
+later release.") %></li>
+
+ <li><%= _("The classification of requests (e.g. to say \
+whether they were successful or not) is done manually by users \
+and administrators of the site, which means that they are \
+subject to error.") %></li>
+
+ <li><%= _("Requests are considered successful if they were \
+classified as either 'Successful' or 'Partially Successful'.") %></li>
+
+ <li><%= _("Requests are considered overdue if they are in \
+the 'Overdue' or 'Very Overdue' states.") %></li>
+
+ <li><%= _("The error bars shown are 95% confidence intervals \
+for the hypothesized underlying proportion (i.e. that which \
+you would obtain by making an infinite number of requests \
+through this site to that authority). In other words, the \
+population being sampled is all the current and future \
+requests to the authority through this site, rather than, \
+say, all requests that have been made to the public body by \
+any means.") %></li>
+
+ </ul>
+
+ <p><%= _("These graphs were partly inspired by \
+<a href=\"http://mark.goodge.co.uk/2011/08/number-crunching-whatdotheyknow/\">some \
+statistics that Mark Goodge produced for WhatDoTheyKnow</a>, so thanks \
+are due to him.") %></p>
+
<% @graph_list.each do |graph_data| %>
<h3 class="public-body-ranking-title"><%= graph_data['title']%></h3>
<div class="public-body-ranking" id="<%= graph_data['id'] %>">