ata type.</p>
<p>In ‘data/raw/surveys’, we find two files: 1) ‘sur_t0_2018_06_10.csv’, containing the results of the demographic questionnaire and the PHQ-9 pre-test, and 2) ‘sur_t1_2018_06_10.csv’, containing the results of the PHQ-9 post-test. In exports of such survey systems, data from all participants are typically stored in one file per assessment moment. Note how the export date is added to the files, to make sure that future updates are only used in the analysis when explicitly noted.</p