Just have a look at ?quantile and the probs argument.

tapply(x, l.c.1, quantile,probs=0.75)

Anyway, quantiles and quartiles are not the same. I guess you meant the
3rd quartile.


> All -
>
> I have an example data frame
>
> x     l.c.1
> 43.38812035   085
> 47.55710661   085
> 47.55710661   085
> 51.99211429   085
> 51.99211429   095
> 54.78449958   095
> 54.78449958   095
> 56.70201864   095
> 56.70201864   105
> 59.66361903   105
> 61.69573564   105
> 61.69573564   105
> 63.77469479   115
> 64.83191994   115
> 64.83191994   115
> 66.98222118   115
> 66.98222118   125
> 66.98222118   125
> 66.98222118   125
> 66.98222118   125
>
> and I'd like to get the 3rd quantile by l.c.1 so I use
>
> tapply(x, l.c.1, quantile)
>
> and my output includes all quantiles (i.e., 0, 25%, 50%, 75%, 100%)
> but I'm only interested in the 75% quantile.  Is there an additional
> statement or function I can use to get just the quantile that I want?
>
> Thanks for your help -
>
> SR
> Steven H. Ranney
>
> ______________________________________________
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

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