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Field
Last Published
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Before
February 28, 2025 10:40 AM
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After
August 01, 2025 04:41 PM
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Field
Planned Number of Observations
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Before
1,500 when analyzing individual-level outcomes. Up to 18,000 (1500 x 12) when analyzing individual-vote level outcomes.
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After
Initial intervention: 1,500 when analyzing individual-level outcomes. Up to 18,000 (1500 x 12) when analyzing individual-vote level outcomes.
Medium-term effects and cross-topic intervention: 4,000 when individual-level outcomes. Up to 36,000 (4,000 x 9) when analyzing individual-vote level outcomes.
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Field
Sample size (or number of clusters) by treatment arms
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Before
1500: 300 for each reasoning condition; 500 for each monetary incentive condition.
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After
1500: 300 for each reasoning condition; 500 for each monetary incentive condition.
4000: 2000 for each reasoning condition.
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Field
Power calculation: Minimum Detectable Effect Size for Main Outcomes
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Before
1. Argument Thoughtfulness score:
Pilot data (non-registered pilot in September 2024) suggests a SD ≈ 2.28 on a 0–6 scale.
With n=1,500, we can detect a mean difference of roughly 0.3–0.55 points (on 6-point scale) with 80% power.
2. Position Shift (Compromise):
Pilot data (non-registered pilot in September 2024) suggests a SD ≈ 0.458 on a binary measure.
With n=1,500, we can detect a mean difference of roughly 6-10 percentage points with 80% power.
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After
1. Argument Thoughtfulness score:
Pilot data (non-registered pilot in September 2024) suggests a SD ≈ 2.28 on a 0–6 scale.
With n=1,500, we can detect a mean difference of roughly 0.3–0.55 points (on 6-point scale) with 80% power.
2. Position Shift (Compromise):
Pilot data (non-registered pilot in September 2024) suggests a SD ≈ 0.458 on a binary measure.
With n=1,500, we can detect a mean difference of roughly 6-10 percentage points with 80% power.
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