5 Donor’s Voice experiments: description

Collaborators on the experiment planning: David Reinstein, Kiki Koutmeridou; also, to a lesser extent, Elizabeth Keenan, Ayelet Gneezy, Hengchen Dai, Enrico Rubaltelli, Stephan Dickert, and Peter Ayton


5.2 Context

Charity: A large US religiously-associated international poverty relief charity

Timing: Emails sent out at the same time withing each trial

First trial: 21-Nov-2018 ‘Thanksgiving email’ Second trial: Nov 2019 (also Thanksgiving email)


Sample size and composition:

First trial:

  • Charity’s standard email list (previous donors with emails)
  • Approx 182,600 emails sent out, 91.3k in each condition

Second trial: - 79,754 emails sent out, exactly half in each condition

5.3 Setup (first trial)


5.4 Setup (second trial)

(Very similar to first trial, but ‘impact information content differed’)

Control:


Treatment text (otherwise as in control):

5.5 Treatment assignment/randomization

From our OSF wiki and OSF prereg

The email will randomly (without blocking/stratification) vary whether or not these emails present a statement about the charity was ‘able to provide with just $10’. …

The charity fundraising partner has informed us that they expect to send out roughly 330,000 emails