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Means by group in JASP (and Jamovi)
Oct 3, 2025
How to do means by group in JASP, for those more used to SPSS and such!
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0:00
Hi, we're going to do comparing means by
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group in JASP. And it's a little
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counterintuitive how you might do that.
0:08
So let's go in together. You go to
0:11
analyses
0:13
and you pick let's pick age as our
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variable. So we want to find out average
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age. So I click on it here on the left.
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I can either double click and it shows
0:22
up or I could click
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once. Let's uh try arthritis. And it
0:29
shows up there, too. So, you can do
0:31
multiple uh at once. Actually, say hours
0:36
of TV per week. Let's take these guys
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out. Hours of TV per week goes from 0 to
0:42
24. That sounds good. And then age goes
0:45
from 18 to 89. I'm looking at minimum
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and maximum here. 18 to 89 because you
0:51
don't take this survey unless you're at
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least 18 years old. And 89 means 89 or
0:57
older. And I know that because I looked
0:59
it up in the book. But if I didn't, I
1:02
could also just go to the age variable
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and double click and the label should
1:11
tell me if this was done properly. There
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we go. So here's the label. It says 89
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or older.
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And there's no similar label for 18.
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Again, I know from reading the
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instructions that this uh survey is only
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given to people 18 and up.
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Now, you can say, okay, we've just found
1:32
out averages, and we can find out more.
1:35
We can also get the median, which is
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always nice.
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And let's see, here's the median. So,
1:42
the median is 48 years old or 2 hours of
1:45
TV, which shows that the people watching
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a lot of TV are dragging the mean up a
1:51
bit. Anyway, how do we do it by groups,
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you might ask? Well, let's say that we
1:56
want to pick a group
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and you want to judge people by um
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whether they have been diagnosed with
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arthritis, you just put it here into
2:08
split
2:11
and it's already done.
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It threw me off slightly because it is
2:17
so fast, but here you see the columns.
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So age with arthritis without arthritis.
2:24
PV hours with arthritis without
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arthritis.
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So the age of people with arthritis is
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older in both median and mean. So if the
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average age is 53 for people with
2:37
arthritis, 42 without and TV hours is
2:41
also a little different. Now you can do
2:43
a t test for the same thing and then
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it'll also tell you the significance.
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But what you can't do is something that
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has multiple values.
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So let's put in atheists. What's your
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view towards atheists? Now here's age
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split up by their feelings towards
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atheists.
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Now you see that it's actually in a sort
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of inconvenient
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uh format if you've got a lot of values
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that you're splitting by. And Jamovi is
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actually much better at this because
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Jamovi does it the conventional way
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which is going uh vertically instead of
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horizontally. But here you see that the
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average age for people who think very
3:33
positively about atheists is 44.
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Somewhat positive is 47. Neither one is
3:39
46. somewhat negative is 53 and very
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negative is 58. So you see that that the
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older that people get it seems the less
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positively they think about atheists
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TV hours it's uh here's the average
3:55
let's see is that the average
3:58
mean
3:59
all right
4:02
so the average TV watching
4:07
seems to go up with somewhat negative
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and very negative and so that's our
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quick look at doing means by group in
4:15
JASP.