[R] using table and tapply?

[Charles C. Berry]

On Sun, 20 Jun 2010, Erin Hodgess wrote:

> Dear R People:
>
> Here is a little section of a data frame:
>
>> zzz[1:10,]
>            DATE GENDER AGE               Co DEATH1
> 3945  2009-04-16      M  24        Botulinic     23
> 3851  2009-04-16      M  35   Constitutional     23
> 8495  2009-04-16      F  49   Constitutional     27
> 10967 2009-04-16      F  47   Constitutional     28
> 11164 2009-04-16      F  26   Constitutional     28
> 15220 2009-04-16      M  49 Gastrointestinal     30
> 1207  2009-04-16      F  39            Other     20
> 1514  2009-04-16      F  39            Other     20
> 2548  2009-04-16      M  49            Other     22
> 3430  2009-04-16      F  54            Other     23
>>
>
> sometimes I want use the date and obtain the totals deaths, sometimes
> I want to use the Co and obtain the total number of deaths, etc.


Like this?

> xtabs(DEATH1~Co,dat)
Co
        Botulinic   Constitutional Gastrointestinal            Other
               23              106               30               85

If not, please say what the result should be.

HTH,

Chuck

>
>
> I've tried "table" and "with" but am having no success.
>
> Any help would be much appreciated.
>
> thanks,
> Erin
>
>
>
>
> -- 
> Erin Hodgess
> Associate Professor
> Department of Computer and Mathematical Sciences
> University of Houston - Downtown
> mailto: erinm.hodgess at gmail.com
>
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>

Charles C. Berry                            (858) 534-2098
                                             Dept of Family/Preventive Medicine
E mailto:cberry at tajo.ucsd.edu	            UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/  La Jolla, San Diego 92093-0901