| http://id.insee.fr/qualite/attribut/2041/I.18.12/text |
http://www.w3.org/1999/02/22-rdf-syntax-ns#value |
<p>The survey is conducted every two months but not all questions are asked every month.</p>
<p>In practice, two models of questionnaires were created to take into account these specificities :</p>
<ul>
<li>
<p>the first questionnaire corresponds to the months of January and July.</p>
</li>
<li>
<p>the second one is sent in March, May, September and November.</p>
</li>
</ul> |
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