[R-sig-ME] Summary of Subgroups

[Chris Howden]

Have a look at aggregate in base r or ddply in plyr package.

Chris Howden
Founding Partner
Tricky Solutions
Tricky Solutions 4 Tricky Problems
Evidence Based Strategic Development, IP Commercialisation and
Innovation, Data Analysis, Modelling and Training

(mobile) 0410 689 945
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chris at trickysolutions.com.au

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> On 8 Aug 2014, at 9:19, Shankar Lanke <shankarlanke at gmail.com> wrote:
>
> Dear R group,
>
> I have a query about summarizing the sub groups. I want to calculate mean
> or median of  BMI & SWTZ of ID 1 to 3 as shown in below table. Actually I
> have 4500 ID's.
> I appreciate your assistance and guidance.
>
>  ID BMI SWTZ  1 22.3 97.7  1 22.3 116  1 22.3 116  1 22.3 110.8  1 22.3
> 110.8  2 27.3 135.8  2 23 119  2 29.4 65.4  2 29.4 65.4  2 29.4 65.4  3 22.3
> 128.1  3 22.3 128.1  3 22.3 128.1  3 22.3 128.1  3 22.3 114.7
>
> Thank you very much in advance.
> --
> Regards,
>
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>
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