User-Tied and User-Untied Tests

In a user-tied test, users are divided into two randomized groups. Conversely, in a user-untied test, individual instances are randomly assigned to two groups. What are the advantages and disadvantages of using a user-tied test compared to a user-untied test?

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User-Tied and User-Untied Tests

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User-Tied and User-Untied Tests

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