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Field
Trial End Date
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Before
December 31, 2022
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After
January 31, 2023
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Field
Last Published
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Before
November 08, 2022 04:25 PM
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After
December 17, 2022 11:15 AM
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Field
Intervention End Date
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Before
December 31, 2022
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After
January 31, 2023
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Field
Randomization Unit
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Before
In the first experiment, randomization occurs on the unit of posts. In the second and third experiments, randomization occurs on the unit of respondents.
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After
In the first experiment, randomization occurs on the unit of posts. In the second and third experiments, randomization occurs on the unit of respondents.
Update (Dec 17, 2022): In the new experiment, randomization also occurs on the unit of respondents.
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Field
Planned Number of Observations
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Before
We will recruit approximately 1,800 ~ 2,000 respondents for the three experiments in total. Each respondent will see six different Weibo posts.
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After
We will recruit approximately 1,800 ~ 2,000 respondents for the three experiments in total. Each respondent will see six different Weibo posts.
Update (Dec 17, 2022): Due to difficulty in recruiting a sufficient number of respondents in China by Qualtrics, we were only able to collect approximately 1,000 responses for the first three experiments. Hence, we will conduct another experiment and use Lucid to recruit another 1,000 respondents for the new experiments (see Update in the Experimental Design section).
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Field
Sample size (or number of clusters) by treatment arms
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Before
In the first experiment, each post will be randomly assigned into one of the four versions (Treatment Arms 1~3 and Control) with equal probability, so we will have approximately 600 respondents * 6 posts/respondents * .25 = 900 posts in each arm.
In the second experiment, respondents will be randomly assigned into one of the four arms, so each arm will have approximately 600 respondents * 0.25 = 150 respondents.
In the third experiment, approximately 1/3 of the respondents will be assigned to Control and 2/3 of the respondents will be assigned to Treatment, so we will have approximately 600 * 1/3 = 200 respondents in Control and 600 * 2/3 = 400 respondents in Treatment.
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After
In the first experiment, each post will be randomly assigned into one of the four versions (Treatment Arms 1~3 and Control) with equal probability, so we will have approximately 600 respondents * 6 posts/respondents * .25 = 900 posts in each arm.
In the second experiment, respondents will be randomly assigned into one of the four arms, so each arm will have approximately 600 respondents * 0.25 = 150 respondents.
In the third experiment, approximately 1/3 of the respondents will be assigned to Control and 2/3 of the respondents will be assigned to Treatment, so we will have approximately 600 * 1/3 = 200 respondents in Control and 600 * 2/3 = 400 respondents in Treatment.
Update (Dec 17, 2022): Due to difficulty in recruiting a sufficient number of respondents in China by Qualtrics, we were only able to collect approximately 1,000 responses for the first three experiments. Hence, we will conduct another experiment and use Lucid to recruit another 1,000 respondents for the new experiments (see Update in the Experimental Design section). The new experiment will have approximately 200 respondents in each arm.
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