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Within a survey, you can use Quotas to specify the number of responses you would like to receive for different sub samples or target groups, or to limit the number of responses for the overall survey. When a quota is reached for a sub-sample, the survey can be closed automatically for respondents belonging to that sub-sample by using conditions and stop nodes, while it remains open for respondents belonging to other sub-samples that have not yet been filled. In addition, Forsta Plus can send alerts by email to specified addresses when a quota is full.
Forsta Plus allows full quota control based on both demographic and attitudinal questions, or not based on any specific questions for an overall quota (global quota) on the total number of completes. Quota control can also be achieved on compound quotas, that is quotas consisting of or built on two or more variables.
Checking for Quota Failure
Use the qf(“quotaname”) function to terminate the interview for respondents who fall into quotas that are full. The qf function returns true if the specified quota is full for the cell.
As shown in the figure below, you can stop the survey for the respondents in a full quota by using a condition and a stop node with status "Quota full".
Figure 1 - Stop node to disposition interviews when a quota cell is filled
The notification email for a full quota is triggered from the qf('quotaname') function. The notification email is not sent when the respondent filling the quota completes (the last to respond before the quota is full), but when the first respondent reaches the qf('quotaname') function when the quota is full.