Pro Features are options that enhance your study by blocking responses from duplicate IP addresses, speeding up data collection, anonymizing Worker IDs, or verifying a worker's location among other things.
The last page in the study setup is the Pro Features page. Pro Features are features meant to enhance your study by adding security, enhancing worker privacy, or verifying a worker's location. Pro Features incur an additional charge, but the charge is a flat fee. Once you use one Pro Feature, you have access to all features for the same price.
- Block Responses from Duplicate IP Addresses
Workers on MTurk may share the same IP address for a variety of reasons (e.g., they are in the same public space, there are multiple people in the same house who both use MTurk, etc). Most researchers do not want to run the risk of collecting responses from multiple people who might share information about a study or one person who somehow submits multiple responses to the same study. For this reason, we created the Block Duplicate IP Addresses feature. When this feature is on, workers from the same IP address will be unable to accept your HIT.
NOTE: The Block Duplicate IP Addresses feature prevents multiple workers from accepting or submitting the HIT from the same IP address. You may still see multiple responses from the same IP address in your data file if the worker who accepted the HIT enters your survey more than once.
Workers can enter a survey more than once even if you are using Qualtrics's "Prevent Ballot Box Stuffing" feature or something similar. The reason why is that the Ballot Box feature works by placing a cookie into the worker's browser. If the worker blocks cookies or uses an Incognito browser, they can reenter your survey simply by copying your survey link into a new browser window.
Data Collection Features
MicroBatching breaks your study into multiple HITs of 9 assignments or less and runs HITs sequentially, allowing you to slow down data collection. MicroBatch cuts MTurk fees from 40% to 20%.
HyperBatching breaks your study into multiple HITs of 9 assignments or less and runs all HITs simultaneously. HyperBatching is the fastest way to collect data and cuts MTurk fees from 40% to 20%.
NOTE: MicroBatch and HyperBatch are mutually exclusive; selecting MircoBatch disables HyperBatch and vice-versa.
Worker Privacy Features
- Anonymized Worker IDs
Some researchers do not want, or are not allowed, to collect Amazon Worker IDs due to privacy concerns. For these researchers we created the “Anonymize Worker IDs” feature. When using this feature, TurkPrime encrypts each worker’s Amazon ID, which results in a unique TurkPrime ID for each worker. TurkPrime IDs are just as functional as Amazon Worker IDs and can be used for all the same purposes (e.g,. including and excluding workers, issuing bonuses, emailing workers). When using the Anonymize Worker IDs feature, all workers will remain anonymous unless they choose to contact the requester by email.
- Enhanced Privacy
If you want to provide workers with extra privacy, you can choose not to collect IP addresses for the people who take your study. When you check the "Enhanced Privacy" box, we do not store IP addresses for your study.
NOTE: When the Enhanced Privacy feature is on, the Block Duplicate IP Addresses feature will be disabled.
Features to Verify or Restrict Worker Location
- Verify Worker Location
When you turn on the "Verify Worker Country and State Location" feature, we will prevent any worker whose IP address does not match the country and location settings you setup for your study. This feature prevents people from taking your study who are not part of your intended sample.
- Target Workers by US Region
If you want to target workers by region of the US or by groups of US states, you can use the "US Regions" feature. This feature enables targeting workers by general region of the country or by more specific sets of states.
NOTE: When you use US Region Targeting, all other country and state location settings you selected earlier in the study setup will be removed.