[R] Aggregate individual level data to age categories

[stei@@@duke m@iii@g oii gm@ii@com]

well, if I think about, its actually a simple frequency table grouped
by age. but it should be usable a matrix or data frame.

On Wed, Feb 12, 2020 at 9:48 PM <cpolwart using chemo.org.uk> wrote:
>
> So a pivot table?
>
> On 12 Feb 2020 20:39, stefan.duke using gmail.com wrote:
>
> Dear All,
>
> I have a seemingly standard problem to which I somehow I do  not find
> a simple solution. I have individual level data where x is a
> categorical variable with 3 categories which I would like to aggregate
> by age.
>
> age x
> 45   1
> 45   2
> 46   1
> 47   3
> 47   3
> and so on.
>
> It should after transformation look like that
>
> age x_1 x_2 x_3
> 45    1     0   1
> 46    1     0   0
> 47     0    0   2
>
> Basically to calculate prevalences by age categories.
>
> Thanks for any pointers!
>
> Cheers!
>
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