|
Field
Trial End Date
|
Before
October 31, 2023
|
After
October 31, 2025
|
|
Field
Last Published
|
Before
November 07, 2022 04:31 PM
|
After
March 31, 2025 08:09 AM
|
|
Field
Intervention End Date
|
Before
October 31, 2023
|
After
October 31, 2025
|
|
Field
Planned Number of Observations
|
Before
We will recruit as many participants as we can, up to our budgeted limit of 200 . Note half will be potential donors and half potential charity recipients.
|
After
We will recruit as many participants as we can, up to our budgeted limit of 200 . Note half will be potential donors and half potential charity recipients.
Modification 01 - We recruited N = 165 (i.e., we did not reach our goal of N = 200). The modification is to attempt to recruit an additional N = 188. See the attached "rcb-Pre-reg004B-v01a-AEA-RCT-Registry-Modification01.pdf"
|
|
Field
Sample size (or number of clusters) by treatment arms
|
Before
100 participants internal; 100 participants external.
|
After
100 participants internal; 100 participants external.
Modification 01 - 176 participants internal; 176 participants external.
|
|
Field
Power calculation: Minimum Detectable Effect Size for Main Outcomes
|
Before
An effect size of .20 to .25 in the difference between the proportions of Low-internal vs. Low-external who ask for charity. See the attached power analysis.
|
After
An effect size of .20 to .25 in the difference between the proportions of Low-internal vs. Low-external who ask for charity. See the attached power analysis.
Modification 01 - 80% power to detect:
(1) A difference of -16.75 in the take-up rate of charity.
(2a) A difference of -18.5 in the donation rate to charity.
(2b) A difference of $1.37 in the average amount donated to charity.
See the attached “rcb-Pre-reg003B-v01a-PowerAnalysis-Modification01.pdf”
|