The original example that you sent was in the long format:
> brkdn(intervals~country,jymint.df,num.desc=c("mean","median"))
Breakdown of intervals by country
Level mean median
au 0.01 0
br -0.07 1
cn -0.32 2
in 0.31 -1
us -0.4 7
> head(jymint.df,20)
country intervals
au1 au 65
au2 au -54
au3 au 27
au4 au -35
au5 au 23
au6 au 29
au7 au -4
au8 au -49
au9 au 42
au10 au -48
au11 au 51
au12 au 27
au13 au -11
au14 au 0
au15 au -37
au16 au 33
au17 au -32
au18 au -12
It was not clear exactly how you wanted to come up with the intervals,
but if you want to do them by country, then the logical place to start
is the long format. Can you provide and example of exactly what you
would be doing with the data to get the intervals. It is hard to tell
from a "word" description what type of data transformations you would
like to do. Take a small subset of the data and show what the
before/after objects might look like.
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