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Field
Last Published
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Before
November 10, 2025 10:08 AM
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After
November 12, 2025 05:57 AM
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Field
Randomization Method
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Before
Done in Excel by the bank
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After
Done in Excel by the bank (note: this pre-registration has been edited on 12/11 to reflect the fact that the bank told us that they are not able to send only one invitation per household as we initially planned but will instead invite all their clients)
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Field
Randomization Unit
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Before
Individual, though the bank will make sure that only one individual per household receives an invitation
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After
Individual
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Field
Planned Number of Clusters
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Before
Each individual person is a "cluster", we will send invitations to 30-50k clients of a German bank (we are currently unsure of the exact number that the bank will be able to send)
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After
Each individual person is a "cluster", we will send invitations to 80-100k clients of a German bank (we are currently unsure of the exact number that the bank will be able to send)
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Field
Planned Number of Observations
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Before
30,000 - 50,000 people
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After
80,000 - 100,000 people
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Field
Sample size (or number of clusters) by treatment arms
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Before
6 treatment arms = about 5000-9000 people per invitation arm
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After
6 treatment arms = about 14,000-17,000 people per invitation arm
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