implementation for Qualtrics (version April 2018). ***Please cite this memo and JavaScript as ”Lundmark, Sebastian, and Jamie Rodriguez. Typing "Ajax" will result in a failure to execute the script. Update January 2019: Corrected JavaScript explanation to say "ajax" instead of "Ajax". This document also contains information regarding the utilization of these true random numbers in question assignment in Qualtrics surveys. Thus, the JavaScript on this page is a template for submitting requests to their server. RANDOM.ORG offers a service to draw random numbers for public users remotely. Random number generators have applications in gambling, statistical sampling, computer simulation, cryptography, completely randomized design, and other areas where producing an unpredictable result is desirable. This offers a greater level of randomness, as it is not in any way contingent upon the actions of the survey participants or any other predictable source (for more information, see ). In contrast, RANDOM.ORG offers “true” random numbers based on atmospheric noise. This means that two participants entering the screen at the same time will be assigned to the same condition (or whatever the randomizer is set to randomize). In the pseudo-random generator used by Qualtrics, the time at which the participant enters the screen with the randomizer serves as the starting seed. These algorithms must use a numerical starting point (a seed) to initiate the number generation. That is, these numbers are generated by following a mathematical algorithm with predictable rules and results. However, the pool of numbers may follow a specific distribution. The pool of numbers is almost always independent from each other. Most computer programs that generate random numbers only exhibit pseudo-randomness. A random number is a number chosen from a pool of limited or unlimited numbers that has no discernible pattern for prediction. The purpose of this document is to explain how JavaScript can be employed to assign random numbers to survey participants through RANDOM.ORG in the survey software Qualtrics.
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