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authorMark Longair <mhl@pobox.com>2013-08-20 10:47:24 +0100
committerMark Longair <mhl@pobox.com>2013-08-20 12:11:45 +0100
commit2e30db88c6d6576e32c2329f7ff75fca7cca8ed9 (patch)
treedaf4eb993b470a048c8ba2b02fe87ef7b6ac1225
parent860cd9ec9935220852ae17498c8b9b7357a2cc3a (diff)
Add some caveats to the experimental statistics page
The statistics we're publishing are potentially subject to misinterpretation, so add some warnings about their experimental nature. Also, add a note crediting Mark Goodge for his useful work on statistics for WhatDoTheyKnow.
-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'] %>">