app/views/shared/stats/_links.html.erb
<p><strong><%= link_to t("stats.title"), "#participation_statistics" %></strong></p>
<ul class="menu vertical">
<li>
<%= link_to t("stats.total_participants"), "#total_participants" %>
</li>
<% stats.participations.each do |stat| %>
<li>
<%= link_to t("stats.by_#{stat}"), "#participants_by_#{stat}" %>
</li>
<% end %>
</ul>