[R] help with combining data frames

[Frank Mattes]

Dear R user,

I'm relative new and need some help / advise from you. I have 
organised my data in several frames, mainly because the data came 
from different sources. One common variable in all data frames is the
day post transplantation. I would like to combine the data frame to 
one big data frame which contains all the data, however no duplicate 
rows should occour (only one row for one day)

Here an example which illustrates what I would like to do:

Frame 1
Day   Hb   wbc
1       10    4
3       11    7
5        9     6


Frame 2

Day   ALT
1        60
2        70
4        50
5        80

Combined

Day   Hb   wbc   ALT
1       10      4     60
2        NA    NA    70
3       11      7     NA
4        NA    NA    50
5         9       6     80

Does anyone know if this can be done, or is it better not to combine 
the frames ?

I appreciate any thoughts or help

Frank Mattes
Department of Virology
Royal Free and University Medical School
London
-- 

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