Overview
Seventy five Mechanical Turk studies conducted with US-based Workers in 2013 and 2014 were reviewed. From a total of 32, 595 Workers, 15,324 (47%) were female.
Background
It’s been a while since the last update on the demographics
of Mechanical Turk Workers, so we thought it’s time for a new look. The current
consensus seems to be that MTurk Workers are primarily female. For example Panos Ipeirotis' blog reports that US-based Workers are 65% female. MTurk is always changing, and
this report presents data from 75 studies conducted over the last two years.
Method/Results
We examined 75 studies that were conducted since the
beginning of 2013. The studies were available only for US-based Workers. The percentage of female workers was computed for each study
and is presented in Figure 1. On average, 47% of Workers were female. However,
there was considerable variation across the studies (SD = 7.3). The smallest
percentage of females in a study was 29.7% and the largest was 62%. A single
sample t-test showed that the percentage of females across all studies was significantly
smaller than 50%, t (74) = -4.1, p. < .0001. This means that over the last two years MTurk studies were more likely to have more male Workers.
Interpretation
Overall, these results show that the gender gap on MTurk has
shifted over the years. The majority of
studies from 3 to 4 years ago have reported that MTurk Workers are
predominantly female. Our results show that since 2013 most HITs have more male
Workers. These differences are not
particularly large however, even though they are statistically significant.
What is most important for any one study is not the overall ratio of male to
female Workers on MTurk but the gender distribution within a specific HIT. Our data
show that there is considerable variation of gender across HITs, with some HIT’s
having less than 30% female Workers, and some over 60%.
It is not clear whether the male/female ratio systematically
depends on other factors. An informal look at some of the data shows that males
are particularly more likely to take HITs during working hours from 9 am to 5
pm. These data may suggest that during
working hours Workers are likely to be unemployed males. We are currently
conducting a systematic study in which we will examine how Worker demographics
vary during different times of day, and days of the week. If it turns out that
the time of day is a systematic predictor of the gender composition of a study,
it may be worthwhile to sample Workers across different times of the day by
pausing a HIT and then restarting at a later time, to reduce common method bias.
What about other demographics?
We also reviewed other demographics, like ethnicity, education,
religious background, family composition, income, and many others. For the most
part these other demographics have remained similar to what has been reported previously. These data have to be examined more thoroughly and will be
presented in a future post.
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