Quotas d'enquête
From LimeSurvey Manual
Explication générale
Les quotas sont utilisés pour limiter les réponses de certains groupes de personnes sur un sondage actif. Des attributs communs doivent être définis comme le genre, l'âge, le lieu de résidence... Un quota peut être ajouté, édité ou supprimé sur une page d'administration spécifique. Pour cela cliquez sur le bouton Définir des quotas de questionnaire 
sur la barre d'administration du questionnaire.
Un questionnaire d'exemple d'utilisation des quotas dans LimeSurvey est disponible au téléchargement. Il est en anglais. Vous pouvez l'importer dans votre installation de LimeSurvey pour le tester (dans l'Onglet "importer" lors de la Création d'un nouveau Questionnaire): LimeSurvey_sample_survey_Quotas.lss
Les quotas ne peuvent être testés que lorsque le sondage est activé. Alors si vous définissez un quota avec une limite à '0' et que l'enquête est inactivée, le quota ne fonctionnera pas.
Précisions sur la gestion des quotas
Les quotas ne sont pas exhaustifs et ne s'excluent pas automatiquement. Prenons un exemple simple pour mieux comprendre. Nous avons une question "OUI ou NON" au début du questionnaire.
Nous posons un quota de 20 personnes pour le OUI. Le quota va être testé à chaque fois que quelqu'un va répondre OUI à cette question, et il va être augmenté si la personne termine le sondage. Si la personne répond OUI mais ne termine pas le sondage, cette réponse ne sera pas comptée dans les quotas. Une fois que 20 personnes auront répondu OUI et aurons terminé le sondage, les prochains à répondre OUI ne pourront continuer.
A contrario, le sondage ne va exclure personne choisissant NON. Pour poser une limite sur les réponses NON, vous devez ajouter un deuxième quota.
To set a limit on the number of "No" responses, you need to add an additional quota, restricting the number of participants who choose "No".
Questions supportées par les quotas
Actuellement, seul les questions suivantes peuvent servir à définir un quota.
- Genre
- Multiples cases à cocher
- Tableau (5 boutons radio)
- Tableau (10 boutons radio)
- Changement de langue
- Oui/Non
- Liste (bouton radio), Liste (Menu déroulant), Liste (avec commentaire)
Example of a quota
You might have to conduct a survey where you want to limit it to 25 male and 30 female respondents. You could then define a quota with a limit of 25 for the answer "Male" from your gender question in the survey. Another quota for the answer "Female" with a limit of 30 could be added as well. This will give you a maximum of 25 males who will be able to complete the survey, and a maximum of 30 females who can complete the survey.
A survey participant has to match all answers under the quota for it to apply to that response.
Adding a new Quota
Adding a new quota is really adding a framework for set of quota conditions. For a fully working quota you must firstly "Add a quota", and then "Add Answers" to that quota (see next section).
When adding a quota, you will be asked for a "Quota Name", the "Quota Limit", and a "Quota Action".
From version 1.85RC you will also have the option of setting your own unique quota "Quota Message", "url" and "URL Description" for each language used in your survey. You can also set "Autoload URL" so that the survey redirects users to the quota URL when the quota action is triggered.
All new quotas are assigned to the Survey you were viewing when you clicked "Set Survey Quotas".
- Quota Name: This is a name to reference the quota by, generally it should describe the quota it will represent.
- Quota Limit: This is maximum number of completed surveys to allow for the quota. This sets a limit that will be check when quota selected questions are answered during the survey.
- Quota Action: This is an action to perform when a participant is filling out a survey and lands up being part of a quota that has become full.
- Terminate Survey: This immediately terminates the survey, and closes the interview.
- Terminate Survey With Warning: This warns the participant and allows them to go back
- Autoload URL: This tells LimeSurvey to automatically redirect the participant to the URL when the quota action occurs. (Only In Version 1.85RC)
- Quota Message: The text displayed to your survey participant if the quota action is triggered (ie: the quota is full). (Only In Version 1.85RC)
- URL: The URL displayed to survey participants after the quota message, or the URL participants are automatically redirected to if 'Autoload URL' is turned on. You can use URL fields in this section. (Only in Version 1.85RC)
- URL Description: The text displayed for the URL. (Only in Version 1.85RC)
Once a quota is added, you will be able to add answers under the quota.
Adding an answer
- Select Question:
+When adding a answer under the quota, you will be shown a list of all available quota questions which are in your survey. If a question does not show up on the list, then its not yet supported with quotas. After you have chosen the question you want, press "Next" to move on to answer selection.
- Select Answer:
+Once selecting your question, you will be show a list of answers under that question. Here you will select an answer you would like to add to you quota, then press "Next".
Adding multiple quotas for the same question & subquestion
Adding multiple quotas for the same question is surely possible - but know that quotas are checked with a logical 'AND' operator - so to meet the quota the user has to answer both subquestion in that question like in your quota.
This means also that multiple quotas for the same subquestion or the same single choice question can never come true.
Quota and response data
All data is saved when the participant clicks the "Next" button. Even if the quota is full, the data submitted until the survey is terminated will be recorded. Nevertheless, such id is marked as "No Completed".
Quota and tokens
When tokens are used in a survey and the user is screened out due to a quota, then the according token entry is marked with the letter "Q" in the Completed column. That way the token is invalidated and the survey participant can't re-start the survey.