Others answered this, but something is left to add. I don't see any
difficulty in combining -min()- with time-series operators. The -drop-
syntax you quote fails because -drop- here expects a varlist and an
expression based on -min()- is not a varlist.
Nick
[email protected]
Rijo John
I have some repeated observations that I need to drop. I have defined
a unique ID variable. There are two other variables "value" and
"month" for these IDs.
Example data.
ID Value month
1 25 12
1 22 8
2 30 9
3 28 8
3 24 6
Only few IDs are repeated in the actual data.
Basically I need to retain only one value per ID. If I do "drop if
ID==ID[_n-1]" after sorting the IDs it could drop any of the values.
But I want the data to retain those values where in month takes the
highest value when I am dropping ID==ID[_n-1]. Something like
drop min(month, month[_n-1]) if ID==ID[_n-1] is what I am looking for.
However, I cant use such time series operators with min function. Any
thoughts?
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