[R] max & min values within dataframe

[Sarah Goslee]

Hi Laura,

This looks suspiciously like homework. Nonetheless, you may wish to
check out ?cbind.

Sarah

On Mon, Nov 14, 2011 at 11:10 AM, B Laura <gm.spam2011 at gmail.com> wrote:
> dear R-team
>
> I need to find the min, max values for each patient from dataset and keep
> the output of it as a dataframe with the following columns
>  - Patient nr
>  - Region (remains same per patient)
>  - Min score
>  - Max score
>
>
>    Patient Region Score Time
> 1        1      X    19   28
> 2        1      X    20  126
> 3        1      X    22  100
> 4        1      X    25  191
> 5        2      Y    12    1
> 6        2      Y    12    2
> 7        2      Y    25    4
> 8        2      Y    26    7
> 9        3      X     6    1
> 10       3      X     6    4
> 11       3      X    21   31
> 12       3      X    22   68
> 13       3      X    23   31
> 14       3      X    24   38
> 15       3      X    21   15
> 16       3      X    22   24
> 17       3      X    23   15
> 18       3      X    24  243
> 19       3      X    25   77
> 20       4      Y     6    5
> 21       4      Y    22   28
> 22       4      Y    23   75
> 23       4      Y    24   19
> 24       5      Y    23    3
> 25       5      Y    24    1
> 26       5      Y    23   33
> 27       5      Y    24   13
> 28       5      Y    25   42
> 29       5      Y    26   21
> 30       5      Y    27    4
> 31       6      Y    24    4
> 32       6      Y    32    8
>
> So far I could find the min and max values for each patient, but the output
> of it is not (yet) what I need.
>
>> Patient.nr = unique(Patient)
>> aggregate(Score, list(Patient), max)
>  Group.1  x
> 1       1 25
> 2       2 26
> 3       3 25
> 4       4 24
> 5       5 27
> 6       6 32
>
>> aggregate(Score, list(Patient), min)
>  Group.1  x
> 1       1 19
> 2       2 12
> 3       3  6
> 4       4  6
> 5       5 23
> 6       6 24
> I would like to do same but writing this new information (min, max values)
> in a dataframe with following columns
>  - Patient nr
> - Region (remains same per patient)
> - Min score
> - Max score
>
> Can anybody help me with this?
>
> Thanks
> Laura

-- 
Sarah Goslee
http://www.functionaldiversity.org