
Hi all,

I wonder if anyone can help,

I have a dataframe with columns for...

'I.D'  'age'  'mothers I.D'
01     5       03
02     6       06
03     16     NA
04     8       06
05     3       NA
06     17     NA

I need to create a new column for 'mothers age' which puts the age of the individual with 'mothers i.d' into the row for her offspring (so individual 01 would have 16 in the mothers age column, as thats the age of individual 03)

Hope that makes sense, any help appreciated,

Thanks
Laura

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