How a more personal subject line affects open rate
Experiment ID: #5924
The Heritage Foundation
Experiment Summary
Timeframe: 01/03/2017 - 01/05/2017
With a little more than two days left before the end of the year, Heritage Foundation email subscribers had received six different messages from Jim DeMint– the president of the organization– asking for their support with a year-end gift. Best practices suggest that the email signer should be the most publicly know leader of the organization, and should rarely (if ever) change to ensure donors hear a consistent voice. Heritage tested that theory by sending an email from someone else in the organization.
Research Question
How does a more personal subject line impact open rate?
Design
C: Control
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T1: Personal Subject Line
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Results
| Treatment Name | Open Rate | Relative Difference | Confidence | |
|---|---|---|---|---|
| C: | Control | 16.9% | ||
| T1: | Personal Subject Line | 33.6% | 98.8% | 100.0% |
This experiment has a required sample size of 52 in order to be valid. Since the experiment had a total sample size of 169,912, and the level of confidence is above 95% the experiment results are valid.
Flux Metrics Affected
The Flux Metrics analyze the three primary metrics that affect revenue (traffic, conversion rate, and average gift). This experiment produced the following results:
98.8% increase in traffic
Ă— 0% increase in conversion rate
Ă— 0% increase in average gift
Key Learnings
This test proved that a more personalized message, even if not from the primary organizational sender, can have a significant impact on open rate — and therefore the donor’s likelihood to give.