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Field
Trial Status
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Before
in_development
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After
completed
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Field
Last Published
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Before
April 03, 2025 01:11 PM
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After
June 30, 2025 09:57 AM
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Field
Planned Number of Observations
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Before
Total sample size of 1,546,578 individuals.
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After
Total sample size of 1,525,314 individuals.
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Field
Sample size (or number of clusters) by treatment arms
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Before
For eligible voters having Finnish or Swedish as their registered mother tongue 20% of the total sample size or approximately 287,877 individuals in the treatment group (message in Finnish and Swedish) and 80% of the total sample size or approximately 1,151,807 individuals in the control group.
For eligible voters having foreign language as their registered mother tongue 33% of the total sample size or approximately 35,631 individuals in the first treatment group (message in Finnish and Swedish), 33% of the total sample size or approximately 35,631 individuals in the second treatment group (message in their own language and Finnish) and 33% of the total sample size or approximately 35,631 individuals in the control group.
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After
For eligible voters having Finnish or Swedish as their registered mother tongue 20% of the total sample size or approximately 287,405 individuals in the treatment group (message in Finnish and Swedish) and 80% of the total sample size or approximately 1,494,622 individuals in the control group.
For eligible voters having foreign language as their registered mother tongue 33% of the total sample size or approximately 29,135 individuals in the first treatment group (message in Finnish and Swedish), 33% of the total sample size or approximately 29,135 individuals in the second treatment group (message in their own language and Finnish) and 33% of the total sample size or approximately 29,135 individuals in the control group.
For eligible voters having foreign language as their registered mother tongue 33% of the total sample size or approximately 35,631 individuals in the first treatment group (message in Finnish and Swedish), 33% of the total sample size or approximately 35,631 individuals in the second treatment group (message in their own language and Finnish) and 33% of the total sample size or approximately 35,631 individuals in the control group.
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Field
Power calculation: Minimum Detectable Effect Size for Main Outcomes
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Before
0.29 %-points between treatment and control for Finnish and Swedish speakers. 0.9 %-points between each treatment group and control group and 0.78 %-points for between two treatments pooled and control group. Assuming p-value of 0.05, power of 0.8, and control
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After
0.29%-points between treatment and control for Finnish and Swedish speakers. 1%-points between each foreign language treatment group and control group and 0.86%-points for between two treatments pooled and control group. Assuming p-value of 0.05, power of 0.8, and control group outcome as 0.59 (turnout for Finnish and Sami speakers in 2017 municipal elections) and 0.24 (turnout for all foreign language speakers in 2017 municipal elections), and not using controls. Two-sided test for two sample proportions calculated by using power function in STATA 18.
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