jamovi

How are percentiles calculated in Jamovi? I have searched high and low and I cannot find a clear answer.
When I request percentiles (25, 50, 75) for the follow set of data:

5
8
10
15
18
25
30
35
40
45

the output reports:
25th 11.3
50th 21.5
75th 33.8

The 50th percentile is pretty straightforward, but I am not sure what is happening for the 25th and 75th percentiles.

hi,

jamovi uses the quantile function from R, which looks to default to "type 7" quantiles.


you can reproduce with the following R code:

quantile(c(5, 8, 10, 15, 18, 25, 30, 35, 40, 45))

cheers

jonathon

Thank you! I appreciate your response. This equation was a bit puzzling to me without knowing more about how the variables were defined.

The R documentation is great though and helped to fill in the gaps.

https://www.rdocumentation.org/packages ... s/quantile