Are men more likely to attend EA London events? Attendance data, 2016-2018.


Using EA London attendance data, David Nash and I found that women* are just as likely to attend one EA event as men. However, women are less likely to return to future EA events. Women and men are about equally likely to attend most learning-focused events, like talks and reading groups. Women are much less likely to attend socials and strategy meetings. I discuss our methodology and implications for EA communities.


Over the past three years, diversity in EA has been a recurring theme on the EA Forum. Alex Gordon-Brown suggested four types of diversity: diversity of talent, experience, opinion, and appearance. He argues that although bonds built on visual attributes like race and gender are normally weaker than bonds based on shared experiences or opinions, they are still important because they’re built so quickly. If there are only a few women in a room full of men, we should expect them to be uncomfortable, even if no one has been unpleasant to them. 

Suggestions on improving diversity in Effective Altruism communities have been made here and here. Suggestions on how to have these conversations constructively, without tokenizing or minimizing the people already in our community, have been made here.

EA London’s events tend to attract more men than women; our typical monthly pub social would be 70% male and 30% female. Is this because women are less likely to attend EA London events for the first time, less likely to return, or both?

David Nash and I found that women are just as likely to attend one EA event as men, but are less likely to return to future EA events. Women and men are about equally likely to attend most learning-focused events, like talks and reading groups, but women are much less likely to attend socials and strategy meetings.

In this article, I describe our research methods and limitations; present the data EA London has collected; discuss implications for EA communities; and suggest next steps for EA gender research.

Methods and Limitations

David compiled attendance data from 5/6/2016 to 8/3/2018. He used a software program to code names as likely male or female; he then corrected some of the entries manually.

It’s possible that we’ve misgendered some attendees, especially if they only attended one or two events. Because we’re using aggregate data about hundreds of people I’m not particularly worried—I think the general trend is still useful.

Obviously, it’s impossible to know if the trends we find in London apply anywhere else. I’m sharing them here as a starting point for research in other communities and discussion about gender in EA spaces.


Below, we have attendance data by gender for all attendees between June 5th 2016 and March 8th 2018. The column to the left shows how many events a given individual has attended; for example, there are 94 men and 37 women who have attended four or more events in the last two years. As a percentage, 28.24% of people who attended four or more EA London events since June 5th 2016 are women.


# of events

Female Percentage

Male #

Female #

Just 1 event




1+ event




2+ event

























































 This table represents the same data in a different way, showing how women are much less likely than men to have attended more than seven EA London events in the last two years.


Over the past two years, how many attendees have been to exactly…?


% Female



1 event




2-3 events




4-6 events




7-19 events




20+ events





This table compares attendance at EA London social events (particularly our monthly pub socials) to all other events we host (including talks, reading groups, and career-specific networking events). This data shows that women are much less likely than men to attend socials, but about as likely to attend non-social events.


































Non Social













Attendance data by event type (not pictured) shows that EA London strategy meetings and monthly pub socials are much more likely to be attended by men than women.

Implications for EA Communities

In London, women are as likely as men to attend an EA event for the first time. Marketing events differently to attract more women seems unnecessary. We don’t have a problem attracting women; we are just less likely to retain them.

EA London events aimed at newcomers tend to be gender balanced, while socials and strategy meetings are heavily male. This makes sense: we’d expect newcomer events to be gender-balanced because 47% of attendees at EA London events are female and 50% of attendees who only attend one event are female. Given that ¾ of regular attendees are male, we’d expect strategy meetings to be male-dominated. It’s more surprising that the monthly pub social was so heavily male, given that it was advertised to newcomers. However, a group of men who are quite involved in EA London regularly attend the monthly pub socials, which may explain why they skew male.

It’s not obvious why women are less likely to return to EA London events. I’m currently doing some qualitative research to investigate what motivates men and women to attend EA London events. I plan to publish it within the next month.

Next Steps

EA London attracts a near-equal number of men and women to its events, but men are more likely to return to future events. We don’t yet know why this happens, but it skews socials and strategy meetings male.

It could be useful for other communities to track their attendance and see if they find similar results. A series of interviews with women from different EA communities who have stopped attending events would also be helpful.

*We made rather simplistic assumptions for this research, based on people’s names and gender presentation. I recognize that not everyone feels comfortable with this binary. Nevertheless, I hope that this research will be a step toward making EA London more welcoming to a wider range of people.

Comments (19)

Comment author: Julia_Wise  (EA Profile) 10 August 2018 01:00:56PM 14 points [-]

After years of speculation on where in the pipeline the difference is appearing, I'm so happy to see numbers that let us have a more concrete idea of what's going on, at least in this group!

Comment author: evemccormick 09 August 2018 05:02:38PM 10 points [-]

Hey, thanks for this :)

EA Cambridge (UK) has been tracking gender ratios at events for several years now, and we have fairly complete data for the last year. As far as I know, this hasn't yet been written up or shared in any formal way, but that is something I would like to do in the near future.

On the topic of pub socials, I don't find the gender bias surprising. The pub socials which we started running this year, aimed at non-students and postgrads, were almost always heavily male-dominated. Other types of pub social that we've run, targetted at newcomers, people somewhat engaged, and people deeply engaged in the community respectively, have similarly been male-dominated. At least two women, despite being deeply involved in the EA Cambridge community, have mentioned to me that they do not feel comfortable at pub socials. So while I think there are probably several reasons why fewer women attend socials in general (e.g. to do with women often feeling less comfortable in situations where they're expected to talk on a topic, especially when they're new), pub environments might compound the problem.

Very much looking forward to reading the results of your research about what motivates men and women to attend events :)

Comment author: DavidNash 09 August 2018 07:03:06PM 11 points [-]

Looking at other social events not at pubs the ratio has been similar, ranging from picnics, hikes, Disney movies, restaurants, education/animal focused topics.

Comment author: cafelow  (EA Profile) 10 August 2018 05:18:59AM 4 points [-]

You show Disney movies at EA meetups!! That is really lovely!

Comment author: Daniel_Eth 11 August 2018 05:45:02AM 6 points [-]

Are women more likely to return for a second event if the gender ratio of the first event they attended was more balanced? This could tell you whether the difference is simply a result of the community being mostly male right now, or if it's due to some other reason(s).

Comment author: DavidNash 11 October 2018 03:04:09PM *  3 points [-]

I looked into this and of the women that came to just 1 event, there was an average of 49% female attendance. Of women who came to 2 or more events, the first event they came to had, an average of 45% female attendance.

Also of the women who came to 5 or more events, half of them came to an event with less than 40% female attendance and half of them came to an event with more than 40%.

Comment author: DavidNash 10 August 2018 08:27:44PM 5 points [-]

There is also some data from Facebook groups that might add context.

On the EA London group with 1797 members the split is 43.8% women and 54.7% men.

For the London animal group with 495 members the split is 50.6% women and 46.9% men.

Comment author: KyleYork 10 August 2018 07:33:10PM 3 points [-]

Some questions that come to mind:

1-- Are women who wish to speak during events given equal (de facto) opportunity to speak? (Of course they are given equal formal opportunity, but as I saw in my postgrad program, group sessions that favour more typically 'masculine' ways of engaging in dialogue-- favouring assertiveness and competitiveness-- would tend to leave the women in my program alienated). 2-- Could the gender difference in jobs and education and its relation to the sorts of activities EA emphasises play a part? 3-- Do women feel uncomfortable at events for any other reason? If they did, would it be in such a way that they could or would report it on a survey? 4-- Would the amount of women in leadership positions alter this? 5-- Have similar surveys been conducted with people of different races and ethnic backgrounds?


Comment author: Khorton 10 August 2018 08:25:07PM *  4 points [-]

Hi Kyle! A lot of these questions are about how women feel at events--I hope to be able to answer them after I finish working through my focus group data. I can tell you that EA London has two paid staff, one male and one female.

We haven't used our attendance data to look for patterns in race/ethnicity because it would be more difficult. We can usually make a good guess at someone's gender from their name and appearance, but can't always make a good guess at someone's ethnic background from their name and appearance. We'd have to ask, and asking first-time visitors about their race seemed like a bad idea.

Comment author: Dunja 10 August 2018 08:24:21AM 1 point [-]

Thanks a lot for this post, that's really interesting and highly relevant. I'd be curious to see also the proportion of women in online forums such as this one. And of course, I'm super interested in possible reasons behind the tendencies you describe.

Comment author: Peter_Hurford  (EA Profile) 11 August 2018 06:44:29PM 4 points [-]

I'd be curious to see also the proportion of women in online forums such as this one.

We have that in the EA Survey data.

Comment author: Khorton 11 August 2018 10:10:54PM 1 point [-]

I'm not sure where to find that - can you link to it or post an extract here?

Comment author: Peter_Hurford  (EA Profile) 13 August 2018 04:49:43AM 3 points [-]

As a baseline, the overall population of the survey was 73% male.

Of those who indicated they were members of the EA Forum, they were 79% male.

Of those who indicated they were member of a local group, they were 72% male.

Of those who indicated they were member of the EA Facebook Group, they were 72% male.

Of those who indicated they were member of GivingWhatWeCan, they were 76% male.

Of those who indicated they were a user of LessWrong, they were 85% male.

(For simplicity only, these responses drop people who don't indicate they are EA, don't answer either question (gender or membership), and don't pick either "Male" or "Female" as their gender. All answers are rounded to the nearest percent. Also, keep in mind the sampling bias of needing to have seen and filled out the survey in order to be counted - this may mean that we don't correctly reflect an unbiased census of the entire population as a whole.)

Comment author: Dunja 15 August 2018 08:30:45AM *  0 points [-]

Oh damn :-/ I was just gonna ask for the info (been traveling and could reply only now). That's really interesting, is this info published somewhere online? If not, it would maybe be worthwhile to make a post on this here and discuss both the reasons for the predominantly male community, as well as ideas for how to make it more gender-balanced.

I'd be very interested in possible relations between the lack of gender balance and the topic of representation discussed in another recent thread. For instance, it'd be interesting to see whether non-male EAs find the forum insufficiently focused on causes which they find more important, or largely focused on issues that they do not find as important.

Comment author: Peter_Hurford  (EA Profile) 15 August 2018 05:27:28PM 1 point [-]

We haven't posted a gender breakdown by group yet. I can see if there may be ways to follow this up as part of our forthcoming 2018 EA Survey work.

Comment author: Dunja 15 August 2018 07:17:16PM 0 points [-]

That would be great!

Comment author: Dale 10 August 2018 10:59:48PM *  -3 points [-]

Interesting data!

Sounds like churn is much lower with men. Unless it is much more expensive (in terms of advertising etc.) to get new men, which looking at the '1+' row doesn't seem to be the case, or women are more productive, this suggests you have a higher Customer-Lifetime-Value / Customer-Acquisition-Cost ratio with men. If this is the case then, to the extent you can, you should re-allocate your efforts at the relevant margin towards attracting more men.


Comment author: Khorton 11 August 2018 10:10:12AM *  7 points [-]

Several previous forum posts have suggested that it's useful to try to have a balance of men and women because:

-In the longer term, only focusing on white, middle-class men who want to do good using evidence will mean we lose out on a large amount of talent and resources. source

-The focus on men might not be reversible: unbalanced events now could put off "highly productive" women, who might continue to view EA unfavourably years later. source

-Diversity will likely make conversations and viewpoints less predictable and more useful. source

Comment author: DavidNash 10 August 2018 11:33:17PM 5 points [-]

It may be a bit short sighted to try and grow in a way that leads to 0.1% of people being interested in effective altruism rather than 5%.

It seems to be a mistake that both the atheist and skeptic communities have made in the past.