Conrad Hackett

Senior Demographer at @PewResearch
Also posting at
& sometimes at

[Sean Westwood @seanjwestwood]

Companies are already monetizing AI survey respondents. Not silicone sampling, but AI completing surveys designed for humans. Not nefarious... yet.

[Conrad Hackett @conradhackett]

@ryanburge

[Conrad Hackett @conradhackett]

@ryanburge Ryan, here are some suggestions for preserving your hair:
1. Ignore the 2021 GSS. Tom Smith told me a couple of years ago that he wouldn't trust numbers from this wave. I see today that the GSS data explorer omits the 2021 wave.
2. Don't do trend analysis with nonprob data.

[Conrad Hackett @conradhackett]

When researchers asked LLMs whether they should switch between religions, LLMs tended to encourage becoming Catholic & shedding atheist & Jehovah's Witness identities.
https://t.co/MA9PUPAigJ

[Conrad Hackett @conradhackett]

Congratulations to the data wizards at @ourworldindata who created this elegant tool so you can adjust fertility, mortality & migration rates for any country to see the impact on population sizes & age structures.

This is really, really great!! Check it out!! Excellent tool, terrific write up.

The wizards: @sophiamersmann @DanyX23 @_HannahRitchie

[Conrad Hackett @conradhackett]

@DanyX23 @OurWorldInData You and your colleagues did a phenomenal job with this! This deserves to be seen and appreciated by millions of people!

[Conrad Hackett @conradhackett]

Congratulations to the data wizards at @ourworldindata who created this elegant tool so you can adjust fertility, mortality & migration rates for any country to see the impact on population sizes & age structures.

This is really, really great!! Check it out!! Excellent tool, terrific write up.

The wizards: @sophiamersmann @DanyX23 @_HannahRitchie

[Our World in Data @OurWorldInData]

How will populations across the world change in the 21st century?

🔧 Explore for yourself with our new interactive tool!

Demographers publish projections using assumptions about key demographic changes, most notably fertility rates, life expectancy, and migration rates.

But no one knows for sure how many children people will have decades from now, or how migration will shift.

So it’s worth asking what the population would look like if things turn out differently from what the UN or other demographers assume.

Our colleagues Daniel Bachler and Sophia Mersmann built a population simulation tool that lets you do just that — for every country in the world.

Pick a country, adjust the assumptions, and see how the projections change, for both total population and age structure.

For instance, what would happen if fertility rates recovered to replacement level, or migration was cut in half?

[Conrad Hackett @conradhackett]

@peterlynas I look forward to analyzing the 2025 British Social Attitudes data when it is publicly released.

There may be large margins of error around weekly attendance rates for respondents tied to religions other than Christianity. Across groups, I favor analyzing monthly attendance.

[Conrad Hackett @conradhackett]

Newly published analysis of 2025 British Social Attitudes data provides no support for claims of a Quiet Revival of churchgoing in Britain. Widely circulated "Quiet Revival" claims resulted from a separate online opt-in survey that was retracted after YouGov (the survey vendor) acknowledged the results were biased by bogus respondents.
https://t.co/PdppqvGw9v

[Conrad Hackett @conradhackett]

@peterlynas @YouGov https://t.co/6Sdc1U2Iip

[Conrad Hackett @conradhackett]

Below, I've highlighted where YouGov admitted that their Quiet Revival survey was biased by fraudulent respondents.

[Conrad Hackett @conradhackett]

Full statement https://t.co/DfcwwioeRj

More background https://t.co/UXQkSVzt1c

[Conrad Hackett @conradhackett]

Below, I've highlighted where YouGov admitted that their Quiet Revival survey was biased by fraudulent respondents.

[Ｐｅｔｅｒ Ｌｙｎａｓ @peterlynas]

@conradhackett I’d also be curious to know where @YouGov said results were “biased by bogus respondents”. They said, “This means this specific survey was particularly vulnerable to sample quality issues” - which isn’t the same thing.

[Conrad Hackett @conradhackett]

Average Sunday service attendance in the Church of England
2019 - 690,000
2025 - 590,000
https://t.co/0zVEGgZm4l

[Conrad Hackett @conradhackett]

"Opt-in polls have been shown to generate erroneous data for young adults and estimates of relatively rare behaviors."
https://t.co/GVvd7C99XY

[Conrad Hackett @conradhackett]

Call for proposals: $10,000 seed grants for research about religion in the U.S.
https://t.co/9hdAUrmdjI

Great opportunity!

[Conrad Hackett @conradhackett]

The call for papers for the International Society for the Sociology of Religion (ISSR) conference in Buenos Aires (February 15-20, 2027) is open until June 10. I'm looking for submissions about religion & demography.
https://t.co/y7GlxMFceP

[Conrad Hackett @conradhackett]

David Voas notes YouGov & Bible Society never published the full dataset from the (now retracted) Quiet Revival report. They declined invites for debate.
https://t.co/eJb7x14xUv

[Conrad Hackett @conradhackett]

NEW: More people have left Catholicism than joined it in 21 of the 24 countries we analyzed.
https://t.co/U18ZmUSyJW

[Conrad Hackett @conradhackett]

NEW: More people have left Catholicism than joined it in 21 of the 24 countries we analyzed.
https://t.co/U18ZmUSyJW

[Conrad Hackett @conradhackett]

Which AI tool can flag ahead of time all the email typos this human doesn't notice until 30 seconds after I hit send?